An update for kernel is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es) :

* It was found that the Linux kernel's IPv6 implementation mishandled socket options. A local attacker could abuse concurrent access to the socket options to escalate their privileges, or cause a denial of service (use-after-free and system crash) via a crafted sendmsg system call. (CVE-2016-3841, Important)

* Several Moderate and Low impact security issues were found in the Linux kernel. Space precludes documenting each of these issues in this advisory. Refer to the CVE links in the References section for a description of each of these vulnerabilities. (CVE-2013-4312, CVE-2015-8374, CVE-2015-8543, CVE-2015-8812, CVE-2015-8844, CVE-2015-8845, CVE-2016-2053, CVE-2016-2069, CVE-2016-2847, CVE-2016-3156, CVE-2016-4581, CVE-2016-4794, CVE-2016-5412, CVE-2016-5828, CVE-2016-5829, CVE-2016-6136, CVE-2016-6198, CVE-2016-6327, CVE-2016-6480, CVE-2015-8746, CVE-2015-8956, CVE-2016-2117, CVE-2016-2384, CVE-2016-3070, CVE-2016-3699, CVE-2016-4569, CVE-2016-4578)

Red Hat would like to thank Philip Pettersson (Samsung) for reporting CVE-2016-2053; Tetsuo Handa for reporting CVE-2016-2847; the Virtuozzo kernel team and Solar Designer (Openwall) for reporting CVE-2016-3156;
Justin Yackoski (Cryptonite) for reporting CVE-2016-2117; and Linn Crosetto (HP) for reporting CVE-2016-3699. The CVE-2015-8812 issue was discovered by Venkatesh Pottem (Red Hat Engineering); the CVE-2015-8844 and CVE-2015-8845 issues were discovered by Miroslav Vadkerti (Red Hat Engineering); the CVE-2016-4581 issue was discovered by Eric W. Biederman (Red Hat); the CVE-2016-6198 issue was discovered by CAI Qian (Red Hat); and the CVE-2016-3070 issue was discovered by Jan Stancek (Red Hat).

Additional Changes :

For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.3 Release Notes linked from the References section.

An update for kernel-rt is now available for Red Hat Enterprise MRG 2.5.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.

The kernel-rt packages have been upgraded to version 3.10.0-514, which provides a number of security and bug fixes over the previous version.
(BZ#1400193)

Security Fix(es) :

* A use-after-free vulnerability was found in the kernel's socket recvmmsg subsystem. This may allow remote attackers to corrupt memory and may allow execution of arbitrary code. This corruption takes place during the error handling routines within __sys_recvmmsg() function.
(CVE-2016-7117, Important)

* A use-after-free vulnerability was found in tcp_xmit_retransmit_queue and other tcp_* functions. This condition could allow an attacker to send an incorrect selective acknowledgment to existing connections, possibly resetting a connection.
(CVE-2016-6828, Moderate)

* A flaw was found in the Linux kernel's implementation of sctp protocol in which a remote attacker can trigger an out of bounds read with an offset of up to 64kB. This may panic the machine with a page-fault. (CVE-2016-9555, Moderate)

Bug Fix(es) :

* Previously, console warnings from the real-time kernel were generated when a sleeping lock was acquired in atomic context. With this update, the code has been modified to not acquire a sleeping lock in this context. As a result, the console warnings are no longer generated. (BZ#1378982)

* Previously, the device mapper (DM) subsystem was not notified that the real-time kernel changes the way preemption works with spinlocks.
This caused a kernel panic when the dm-multipath kernel module was loaded because the interrupt request (IRQ) check was invalid on the real-time kernel. This check has been corrected enabling the system to boot correctly with the dm-multipath module enabled. (BZ#1400305)

* Previously, the kernel could sometimes panic due to a possible division by zero in the scheduler. This bug has been fixed by defining a new div64_ul() division function and correcting the affected calculation in the proc_sched_show_task() function. (BZ#1400975)

* Unlike the standard Linux kernel, the real-time kernel does not disable interrupts inside the Interrupt Service Routines driver.
Because of this difference, a New API (NAPI) function for turning interrupt requests (IRQ) off was actually being called with IRQs enabled. Consequently, the NAPI poll list was being corrupted, causing improper networking card operation and potential kernel hangs. With this update, the NAPI function has been corrected to force modifications of the poll list to be protected allowing proper operation of the networking card drivers. (BZ#1401779)

Enhancement(s) :

* With this update, the CONFIG_SLUB_DEBUG and CONFIG_SLABINFO kernel configuration options are enabled in the real-time kernel. These options turn on SLUB allocator debugging and slab information tracking, which are helpful when investigating kernel memory allocation problems. (BZ#1357997)

The SUSE Linux Enterprise 12 GA LTSS kernel was updated to receive various security and bugfixes. This update adds mitigations for various side channel attacks against modern CPUs that could disclose content of otherwise unreadable memory (bnc#1068032).

  - CVE-2017-5753 / 'SpectreAttack': Local attackers on     systems with modern CPUs featuring deep instruction     pipelining could use attacker controllable speculative     execution over code patterns in the Linux Kernel to leak     content from otherwise not readable memory in the same     address space, allowing retrieval of passwords,     cryptographic keys and other secrets. This problem is     mitigated by adding speculative fencing on affected code     paths throughout the Linux kernel. This issue is     addressed for the x86_64, the IBM Power and IBM zSeries     architecture.

  - CVE-2017-5715 / 'SpectreAttack': Local attackers on     systems with modern CPUs featuring branch prediction     could use mispredicted branches to speculatively execute     code patterns that in turn could be made to leak other     non-readable content in the same address space, an     attack similar to CVE-2017-5753. This problem is     mitigated by disabling predictive branches, depending on     CPU architecture either by firmware updates and/or fixes     in the user-kernel privilege boundaries. This is done     with help of Linux Kernel fixes on the Intel/AMD x86_64     and IBM zSeries architectures. On x86_64, this requires     also updates of the CPU microcode packages, delivered in     separate updates. For IBM Power and zSeries the required     firmware updates are supplied over regular channels by     IBM. As this feature can have a performance impact, it     can be disabled using the 'nospec' kernel commandline     option.

  - CVE-2017-5754 / 'MeltdownAttack': Local attackers on     systems with modern CPUs featuring deep instruction     pipelining could use code patterns in userspace to     speculative executive code that would read otherwise     read protected memory, an attack similar to     CVE-2017-5753. This problem is mitigated by unmapping     the Linux Kernel from the user address space during user     code execution, following a approach called 'KAISER'.
    The terms used here are 'KAISER' / 'Kernel Address     Isolation' and 'PTI' / 'Page Table Isolation'. This     update does this on the x86_64 architecture, it is not     required on the IBM zSeries architecture. This feature     can be enabled / disabled by the 'pti=[on|off|auto]' or     'nopti' commandline options. The following security bugs     were fixed :

  - CVE-2017-15868: The bnep_add_connection function in     net/bluetooth/bnep/core.c in the Linux kernel did not     ensure that an l2cap socket is available, which allowed     local users to gain privileges via a crafted application     (bnc#1071470).

  - CVE-2017-13167: An elevation of privilege vulnerability     in the kernel sound timer. (bnc#1072876).

  - CVE-2017-16538: drivers/media/usb/dvb-usb-v2/lmedm04.c     in the Linux kernel allowed local users to cause a     denial of service (general protection fault and system     crash) or possibly have unspecified other impact via a     crafted USB device, related to a missing warm-start     check and incorrect attach timing     (dm04_lme2510_frontend_attach versus dm04_lme2510_tuner)     (bnc#1066569).

  - CVE-2017-17558: The usb_destroy_configuration function     in drivers/usb/core/config.c in the USB core subsystem     in the Linux kernel did not consider the maximum number     of configurations and interfaces before attempting to     release resources, which allowed local users to cause a     denial of service (out-of-bounds write access) or     possibly have unspecified other impact via a crafted USB     device (bnc#1072561).

  - CVE-2017-17450: net/netfilter/xt_osf.c in the Linux     kernel did not require the CAP_NET_ADMIN capability for     add_callback and remove_callback operations, which     allowed local users to bypass intended access     restrictions because the xt_osf_fingers data structure     is shared across all net namespaces (bnc#1071695).

  - CVE-2017-17449: The __netlink_deliver_tap_skb function     in net/netlink/af_netlink.c in the Linux kernel through     4.14.4, when CONFIG_NLMON is enabled, did not restrict     observations of Netlink messages to a single net     namespace, which allowed local users to obtain sensitive     information by leveraging the CAP_NET_ADMIN capability     to sniff an nlmon interface for all Netlink activity on     the system (bnc#1071694).

  - CVE-2017-17448: net/netfilter/nfnetlink_cthelper.c in     the Linux kernel did not require the CAP_NET_ADMIN     capability for new, get, and del operations, which     allowed local users to bypass intended access     restrictions because the nfnl_cthelper_list data     structure is shared across all net namespaces     (bnc#1071693).

  - CVE-2017-8824: The dccp_disconnect function in     net/dccp/proto.c in the Linux kernel allowed local users     to gain privileges or cause a denial of service     (use-after-free) via an AF_UNSPEC connect system call     during the DCCP_LISTEN state (bnc#1070771).

  - CVE-2017-15115: The sctp_do_peeloff function in     net/sctp/socket.c in the Linux kernel did not check     whether the intended netns is used in a peel-off action,     which allowed local users to cause a denial of service     (use-after-free and system crash) or possibly have     unspecified other impact via crafted system calls     (bnc#1068671).

  - CVE-2017-11600: net/xfrm/xfrm_policy.c in the Linux     kernel through 4.12.3, when CONFIG_XFRM_MIGRATE is     enabled, did not ensure that the dir value of     xfrm_userpolicy_id is XFRM_POLICY_MAX or less, which     allowed local users to cause a denial of service     (out-of-bounds access) or possibly have unspecified     other impact via an XFRM_MSG_MIGRATE xfrm Netlink     message (bnc#1050231).

  - CVE-2017-16534: The cdc_parse_cdc_header function in     drivers/usb/core/message.c in the Linux kernel allowed     local users to cause a denial of service (out-of-bounds     read and system crash) or possibly have unspecified     other impact via a crafted USB device (bnc#1066693).

The update package also includes non-security fixes. See advisory for details.

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

An update for kernel-rt is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.

Security Fix(es) :

* It was found that the Linux kernel's IPv6 implementation mishandled socket options. A local attacker could abuse concurrent access to the socket options to escalate their privileges, or cause a denial of service (use-after-free and system crash) via a crafted sendmsg system call. (CVE-2016-3841, Important)

* Several Moderate and Low impact security issues were found in the Linux kernel. Space precludes documenting each of these issues in this advisory. Refer to the CVE links in the References section for a description of each of these vulnerabilities. (CVE-2013-4312, CVE-2015-8374, CVE-2015-8543, CVE-2015-8812, CVE-2015-8844, CVE-2015-8845, CVE-2016-2053, CVE-2016-2069, CVE-2016-2847, CVE-2016-3156, CVE-2016-4581, CVE-2016-4794, CVE-2016-5829, CVE-2016-6136, CVE-2016-6198, CVE-2016-6327, CVE-2016-6480, CVE-2015-8746, CVE-2015-8956, CVE-2016-2117, CVE-2016-2384, CVE-2016-3070, CVE-2016-3699, CVE-2016-4569, CVE-2016-4578)

Red Hat would like to thank Philip Pettersson (Samsung) for reporting CVE-2016-2053; Tetsuo Handa for reporting CVE-2016-2847; the Virtuozzo kernel team and Solar Designer (Openwall) for reporting CVE-2016-3156;
Justin Yackoski (Cryptonite) for reporting CVE-2016-2117; and Linn Crosetto (HP) for reporting CVE-2016-3699. The CVE-2015-8812 issue was discovered by Venkatesh Pottem (Red Hat Engineering); the CVE-2015-8844 and CVE-2015-8845 issues were discovered by Miroslav Vadkerti (Red Hat Engineering); the CVE-2016-4581 issue was discovered by Eric W. Biederman (Red Hat); the CVE-2016-6198 issue was discovered by CAI Qian (Red Hat); and the CVE-2016-3070 issue was discovered by Jan Stancek (Red Hat).

Additional Changes :

For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.3 Release Notes linked from the References section.

The remote Redhat Enterprise Linux 5 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - kernel: netfilter: use-after-free in tcpmss_mangle_packet function in net/netfilter/xt_TCPMSS.c     (CVE-2017-18017)

  - The ia64 subsystem in the Linux kernel before 2.6.26 allows local users to cause a denial of service     (stack consumption and system crash) via a crafted application that leverages the mishandling of invalid     Register Stack Engine (RSE) state. (CVE-2006-3635)

  - drivers/media/video/videobuf-vmalloc.c in the Linux kernel before 2.6.24 does not initialize     videobuf_mapping data structures, which allows local users to trigger an incorrect count value and     videobuf leak via unspecified vectors, a different vulnerability than CVE-2010-5321. (CVE-2007-6761)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

The SUSE Linux Enterprise 11 SP3 LTSS kernel was updated to receive various security and bugfixes. This update adds mitigations for various side channel attacks against modern CPUs that could disclose content of otherwise unreadable memory (bnc#1068032).

  - CVE-2017-5753: Local attackers on systems with modern     CPUs featuring deep instruction pipelining could use     attacker controllable speculative execution over code     patterns in the Linux Kernel to leak content from     otherwise not readable memory in the same address space,     allowing retrieval of passwords, cryptographic keys and     other secrets. This problem is mitigated by adding     speculative fencing on affected code paths throughout     the Linux kernel.

  - CVE-2017-5715: Local attackers on systems with modern     CPUs featuring branch prediction could use mispredicted     branches to speculatively execute code patterns that in     turn could be made to leak other non-readable content in     the same address space, an attack similar to     CVE-2017-5753. This problem is mitigated by disabling     predictive branches, depending on CPU architecture     either by firmware updates and/or fixes in the     user-kernel privilege boundaries. Please contact your     CPU / hardware vendor for potential microcode or BIOS     updates needed for this fix. As this feature can have a     performance impact, it can be disabled using the     'nospec' kernel commandline option.

  - CVE-2017-5754: Local attackers on systems with modern     CPUs featuring deep instruction pipelining could use     code patterns in userspace to speculative executive code     that would read otherwise read protected memory, an     attack similar to CVE-2017-5753. This problem is     mitigated by unmapping the Linux Kernel from the user     address space during user code execution, following a     approach called 'KAISER'. The terms used here are     'KAISER' / 'Kernel Address Isolation' and 'PTI' / 'Page     Table Isolation'. This feature is disabled on unaffected     architectures. This feature can be enabled / disabled by     the 'pti=[on|off|auto]' or 'nopti' commandline options.
    The following security bugs were fixed :

  - CVE-2017-1000251: The native Bluetooth stack in the     Linux Kernel (BlueZ) was vulnerable to a stack overflow     vulnerability in the processing of L2CAP configuration     responses resulting in Remote code execution in kernel     space (bnc#1057389).

  - CVE-2017-11600: net/xfrm/xfrm_policy.c in the Linux     kernel did not ensure that the dir value of     xfrm_userpolicy_id is XFRM_POLICY_MAX or less, which     allowed local users to cause a denial of service     (out-of-bounds access) or possibly have unspecified     other impact via an XFRM_MSG_MIGRATE xfrm Netlink     message (bnc#1050231).

  - CVE-2017-13080: Wi-Fi Protected Access (WPA and WPA2)     allowed reinstallation of the Group Temporal Key (GTK)     during the group key handshake, allowing an attacker     within radio range to replay frames from access points     to clients (bnc#1063667).

  - CVE-2017-13167: An elevation of privilege vulnerability     in the kernel sound timer was fixed. (bnc#1072876).

  - CVE-2017-14106: The tcp_disconnect function in     net/ipv4/tcp.c in the Linux kernel allowed local users     to cause a denial of service (__tcp_select_window     divide-by-zero error and system crash) by triggering a     disconnect within a certain tcp_recvmsg code path     (bnc#1056982).

  - CVE-2017-14140: The move_pages system call in     mm/migrate.c in the Linux kernel didn't check the     effective uid of the target process, enabling a local     attacker to learn the memory layout of a setuid     executable despite ASLR (bnc#1057179).

  - CVE-2017-14340: The XFS_IS_REALTIME_INODE macro in     fs/xfs/xfs_linux.h in the Linux kernel did not verify     that a filesystem has a realtime device, which allowed     local users to cause a denial of service (NULL pointer     dereference and OOPS) via vectors related to setting an     RHINHERIT flag on a directory (bnc#1058524).

  - CVE-2017-15102: The tower_probe function in     drivers/usb/misc/legousbtower.c in the Linux kernel     allowed local users (who are physically proximate for     inserting a crafted USB device) to gain privileges by     leveraging a write-what-where condition that occurs     after a race condition and a NULL pointer dereference     (bnc#1066705).

  - CVE-2017-15115: The sctp_do_peeloff function in     net/sctp/socket.c in the Linux kernel did not check     whether the intended netns is used in a peel-off action,     which allowed local users to cause a denial of service     (use-after-free and system crash) or possibly have     unspecified other impact via crafted system calls     (bnc#1068671).

  - CVE-2017-15265: Race condition in the ALSA subsystem in     the Linux kernel allowed local users to cause a denial     of service (use-after-free) or possibly have unspecified     other impact via crafted /dev/snd/seq ioctl calls,     related to sound/core/seq/seq_clientmgr.c and     sound/core/seq/seq_ports.c (bnc#1062520).

  - CVE-2017-15274: security/keys/keyctl.c in the Linux     kernel did not consider the case of a NULL payload in     conjunction with a nonzero length value, which allowed     local users to cause a denial of service (NULL pointer     dereference and OOPS) via a crafted add_key or keyctl     system call, a different vulnerability than     CVE-2017-12192 (bnc#1045327).

  - CVE-2017-15868: The bnep_add_connection function in     net/bluetooth/bnep/core.c in the Linux kernel did not     ensure that an l2cap socket is available, which allowed     local users to gain privileges via a crafted application     (bnc#1071470).

  - CVE-2017-16525: The usb_serial_console_disconnect     function in drivers/usb/serial/console.c in the Linux     kernel allowed local users to cause a denial of service     (use-after-free and system crash) or possibly have     unspecified other impact via a crafted USB device,     related to disconnection and failed setup (bnc#1066618).

  - CVE-2017-16527: sound/usb/mixer.c in the Linux kernel     allowed local users to cause a denial of service     (snd_usb_mixer_interrupt use-after-free and system     crash) or possibly have unspecified other impact via a     crafted USB device (bnc#1066625).

  - CVE-2017-16529: The snd_usb_create_streams function in     sound/usb/card.c in the Linux kernel allowed local users     to cause a denial of service (out-of-bounds read and     system crash) or possibly have unspecified other impact     via a crafted USB device (bnc#1066650).

  - CVE-2017-16531: drivers/usb/core/config.c in the Linux     kernel allowed local users to cause a denial of service     (out-of-bounds read and system crash) or possibly have     unspecified other impact via a crafted USB device,     related to the USB_DT_INTERFACE_ASSOCIATION descriptor     (bnc#1066671).

  - CVE-2017-16534: The cdc_parse_cdc_header function in     drivers/usb/core/message.c in the Linux kernel allowed     local users to cause a denial of service (out-of-bounds     read and system crash) or possibly have unspecified     other impact via a crafted USB device (bnc#1066693).

  - CVE-2017-16535: The usb_get_bos_descriptor function in     drivers/usb/core/config.c in the Linux kernel allowed     local users to cause a denial of service (out-of-bounds     read and system crash) or possibly have unspecified     other impact via a crafted USB device (bnc#1066700).

  - CVE-2017-16536: The cx231xx_usb_probe function in     drivers/media/usb/cx231xx/cx231xx-cards.c in the Linux     kernel allowed local users to cause a denial of service     (NULL pointer dereference and system crash) or possibly     have unspecified other impact via a crafted USB device     (bnc#1066606).

  - CVE-2017-16537: The imon_probe function in     drivers/media/rc/imon.c in the Linux kernel allowed     local users to cause a denial of service (NULL pointer     dereference and system crash) or possibly have     unspecified other impact via a crafted USB device     (bnc#1066573).

  - CVE-2017-16538: drivers/media/usb/dvb-usb-v2/lmedm04.c     in the Linux kernel allowed local users to cause a     denial of service (general protection fault and system     crash) or possibly have unspecified other impact via a     crafted USB device, related to a missing warm-start     check and incorrect attach timing     (dm04_lme2510_frontend_attach versus dm04_lme2510_tuner)     (bnc#1066569).

  - CVE-2017-16649: The usbnet_generic_cdc_bind function in     drivers/net/usb/cdc_ether.c in the Linux kernel allowed     local users to cause a denial of service (divide-by-zero     error and system crash) or possibly have unspecified     other impact via a crafted USB device (bnc#1067085).

  - CVE-2017-16939: The XFRM dump policy implementation in     net/xfrm/xfrm_user.c in the Linux kernel allowed local     users to gain privileges or cause a denial of service     (use-after-free) via a crafted SO_RCVBUF setsockopt     system call in conjunction with XFRM_MSG_GETPOLICY     Netlink messages (bnc#1069702 1069708).

  - CVE-2017-17450: net/netfilter/xt_osf.c in the Linux     kernel did not require the CAP_NET_ADMIN capability for     add_callback and remove_callback operations, which     allowed local users to bypass intended access     restrictions because the xt_osf_fingers data structure     is shared across all net namespaces (bnc#1071695     1074033).

  - CVE-2017-17558: The usb_destroy_configuration function     in drivers/usb/core/config.c in the USB core subsystem     in the Linux kernel did not consider the maximum number     of configurations and interfaces before attempting to     release resources, which allowed local users to cause a     denial of service (out-of-bounds write access) or     possibly have unspecified other impact via a crafted USB     device (bnc#1072561).

  - CVE-2017-17805: The Salsa20 encryption algorithm in the     Linux kernel did not correctly handle zero-length     inputs, allowing a local attacker able to use the     AF_ALG-based skcipher interface     (CONFIG_CRYPTO_USER_API_SKCIPHER) to cause a denial of     service (uninitialized-memory free and kernel crash) or     have unspecified other impact by executing a crafted     sequence of system calls that use the blkcipher_walk     API. Both the generic implementation     (crypto/salsa20_generic.c) and x86 implementation     (arch/x86/crypto/salsa20_glue.c) of Salsa20 were     vulnerable (bnc#1073792).

  - CVE-2017-17806: The HMAC implementation (crypto/hmac.c)     in the Linux kernel did not validate that the underlying     cryptographic hash algorithm is unkeyed, allowing a     local attacker able to use the AF_ALG-based hash     interface (CONFIG_CRYPTO_USER_API_HASH) and the SHA-3     hash algorithm (CONFIG_CRYPTO_SHA3) to cause a kernel     stack-based buffer overflow by executing a crafted     sequence of system calls that encounter a missing SHA-3     initialization (bnc#1073874).

  - CVE-2017-7472: The KEYS subsystem in the Linux kernel     allowed local users to cause a denial of service (memory     consumption) via a series of     KEY_REQKEY_DEFL_THREAD_KEYRING keyctl_set_reqkey_keyring     calls (bnc#1034862).

  - CVE-2017-8824: The dccp_disconnect function in     net/dccp/proto.c in the Linux kernel allowed local users     to gain privileges or cause a denial of service     (use-after-free) via an AF_UNSPEC connect system call     during the DCCP_LISTEN state (bnc#1070771).

The update package also includes non-security fixes. See advisory for details.

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The SUSE Linux Enterprise 12 SP1 LTSS kernel was updated to receive various security and bugfixes. This update adds mitigations for various side channel attacks against modern CPUs that could disclose content of otherwise unreadable memory (bnc#1068032).

  - CVE-2017-5753 / 'SpectreAttack': Local attackers on     systems with modern CPUs featuring deep instruction     pipelining could use attacker controllable speculative     execution over code patterns in the Linux Kernel to leak     content from otherwise not readable memory in the same     address space, allowing retrieval of passwords,     cryptographic keys and other secrets. This problem is     mitigated by adding speculative fencing on affected code     paths throughout the Linux kernel. This issue is     addressed for the x86_64, IBM Power and IBM zSeries     architecture.

  - CVE-2017-5715 / 'SpectreAttack': Local attackers on     systems with modern CPUs featuring branch prediction     could use mispredicted branches to speculatively execute     code patterns that in turn could be made to leak other     non-readable content in the same address space, an     attack similar to CVE-2017-5753. This problem is     mitigated by disabling predictive branches, depending on     CPU architecture either by firmware updates and/or fixes     in the user-kernel privilege boundaries. This is done     with help of Linux Kernel fixes on the Intel/AMD x86_64     and IBM zSeries architectures. On x86_64, this requires     also updates of the CPU microcode packages, delivered in     separate updates. For IBM Power and zSeries the required     firmware updates are supplied over regular channels by     IBM. As this feature can have a performance impact, it     can be disabled using the 'nospec' kernel commandline     option.

  - CVE-2017-5754 / 'MeltdownAttack': Local attackers on     systems with modern CPUs featuring deep instruction     pipelining could use code patterns in userspace to     speculative executive code that would read otherwise     read protected memory, an attack similar to     CVE-2017-5753. This problem is mitigated by unmapping     the Linux Kernel from the user address space during user     code execution, following a approach called 'KAISER'.
    The terms used here are 'KAISER' / 'Kernel Address     Isolation' and 'PTI' / 'Page Table Isolation'. This     update does this on the x86_64 architecture, it is not     required on the IBM zSeries architecture. This feature     can be enabled / disabled by the 'pti=[on|off|auto]' or     'nopti' commandline options. The following security bugs     were fixed :

  - CVE-2017-15868: The bnep_add_connection function in     net/bluetooth/bnep/core.c in the Linux kernel did not     ensure that an l2cap socket is available, which allowed     local users to gain privileges via a crafted application     (bnc#1071470).

  - CVE-2017-13167: An elevation of privilege vulnerability     in the kernel sound timer. (bnc#1072876).

  - CVE-2017-16538: drivers/media/usb/dvb-usb-v2/lmedm04.c     in the Linux kernel allowed local users to cause a     denial of service (general protection fault and system     crash) or possibly have unspecified other impact via a     crafted USB device, related to a missing warm-start     check and incorrect attach timing     (dm04_lme2510_frontend_attach versus dm04_lme2510_tuner)     (bnc#1066569).

  - CVE-2017-17558: The usb_destroy_configuration function     in drivers/usb/core/config.c in the USB core subsystem     in the Linux kernel did not consider the maximum number     of configurations and interfaces before attempting to     release resources, which allowed local users to cause a     denial of service (out-of-bounds write access) or     possibly have unspecified other impact via a crafted USB     device (bnc#1072561).

  - CVE-2017-17450: net/netfilter/xt_osf.c in the Linux     kernel did not require the CAP_NET_ADMIN capability for     add_callback and remove_callback operations, which     allowed local users to bypass intended access     restrictions because the xt_osf_fingers data structure     is shared across all net namespaces (bnc#1071695).

  - CVE-2017-17449: The __netlink_deliver_tap_skb function     in net/netlink/af_netlink.c in the Linux kernel through     4.14.4, when CONFIG_NLMON is enabled, did not restrict     observations of Netlink messages to a single net     namespace, which allowed local users to obtain sensitive     information by leveraging the CAP_NET_ADMIN capability     to sniff an nlmon interface for all Netlink activity on     the system (bnc#1071694).

  - CVE-2017-17448: net/netfilter/nfnetlink_cthelper.c in     the Linux kernel did not require the CAP_NET_ADMIN     capability for new, get, and del operations, which     allowed local users to bypass intended access     restrictions because the nfnl_cthelper_list data     structure is shared across all net namespaces     (bnc#1071693).

  - CVE-2017-8824: The dccp_disconnect function in     net/dccp/proto.c in the Linux kernel allowed local users     to gain privileges or cause a denial of service     (use-after-free) via an AF_UNSPEC connect system call     during the DCCP_LISTEN state (bnc#1070771).

  - CVE-2017-15115: The sctp_do_peeloff function in     net/sctp/socket.c in the Linux kernel did not check     whether the intended netns is used in a peel-off action,     which allowed local users to cause a denial of service     (use-after-free and system crash) or possibly have     unspecified other impact via crafted system calls     (bnc#1068671).

  - CVE-2017-11600: net/xfrm/xfrm_policy.c in the Linux     kernel through 4.12.3, when CONFIG_XFRM_MIGRATE is     enabled, did not ensure that the dir value of     xfrm_userpolicy_id is XFRM_POLICY_MAX or less, which     allowed local users to cause a denial of service     (out-of-bounds access) or possibly have unspecified     other impact via an XFRM_MSG_MIGRATE xfrm Netlink     message (bnc#1050231).

  - CVE-2017-16534: The cdc_parse_cdc_header function in     drivers/usb/core/message.c in the Linux kernel allowed     local users to cause a denial of service (out-of-bounds     read and system crash) or possibly have unspecified     other impact via a crafted USB device (bnc#1066693).

The update package also includes non-security fixes. See advisory for details.

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The SUSE Linux Enterprise 11 SP4 kernel was updated to receive various security and bugfixes. This update adds mitigations for various side channel attacks against modern CPUs that could disclose content of otherwise unreadable memory (bnc#1068032).

  - CVE-2017-5753: Local attackers on systems with modern     CPUs featuring deep instruction pipelining could use     attacker controllable speculative execution over code     patterns in the Linux Kernel to leak content from     otherwise not readable memory in the same address space,     allowing retrieval of passwords, cryptographic keys and     other secrets. This problem is mitigated by adding     speculative fencing on affected code paths throughout     the Linux kernel. This issue is addressed for the     x86_64, the IBM Power and IBM zSeries architecture.

  - CVE-2017-5715: Local attackers on systems with modern     CPUs featuring branch prediction could use mispredicted     branches to speculatively execute code patterns that in     turn could be made to leak other non-readable content in     the same address space, an attack similar to     CVE-2017-5753. This problem is mitigated by disabling     predictive branches, depending on CPU architecture     either by firmware updates and/or fixes in the     user-kernel privilege boundaries. This is done with help     of Linux Kernel fixes on the Intel/AMD x86_64 and IBM     zSeries architectures. On x86_64, this requires also     updates of the CPU microcode packages, delivered in     separate updates. For IBM Power and zSeries the required     firmware updates are supplied over regular channels by     IBM. As this feature can have a performance impact, it     can be disabled using the 'nospec' kernel commandline     option.

  - CVE-2017-5754: Local attackers on systems with modern     CPUs featuring deep instruction pipelining could use     code patterns in userspace to speculative executive code     that would read otherwise read protected memory, an     attack similar to CVE-2017-5753. This problem is     mitigated by unmapping the Linux Kernel from the user     address space during user code execution, following a     approach called 'KAISER'. The terms used here are     'KAISER' / 'Kernel Address Isolation' and 'PTI' / 'Page     Table Isolation'. This update does this on the Intel     x86_64 and IBM Power architecture. Updates are also     necessary for the ARM architecture, but will be     delivered in the next round of updates. This feature can     be enabled / disabled by the 'pti=[on|off|auto]' or     'nopti' commandline options. The following security bugs     were fixed :

  - CVE-2017-17806: The HMAC implementation (crypto/hmac.c)     in the Linux kernel did not validate that the underlying     cryptographic hash algorithm is unkeyed, allowing a     local attacker able to use the AF_ALG-based hash     interface (CONFIG_CRYPTO_USER_API_HASH) and the SHA-3     hash algorithm (CONFIG_CRYPTO_SHA3) to cause a kernel     stack-based buffer overflow by executing a crafted     sequence of system calls that encounter a missing SHA-3     initialization (bnc#1073874).

  - CVE-2017-17805: The Salsa20 encryption algorithm in the     Linux kernel did not correctly handle zero-length     inputs, allowing a local attacker able to use the     AF_ALG-based skcipher interface     (CONFIG_CRYPTO_USER_API_SKCIPHER) to cause a denial of     service (uninitialized-memory free and kernel crash) or     have unspecified other impact by executing a crafted     sequence of system calls that use the blkcipher_walk     API. Both the generic implementation     (crypto/salsa20_generic.c) and x86 implementation     (arch/x86/crypto/salsa20_glue.c) of Salsa20 were     vulnerable (bnc#1073792).

  - CVE-2017-15868: The bnep_add_connection function in     net/bluetooth/bnep/core.c in the Linux kernel did not     ensure that an l2cap socket is available, which allowed     local users to gain privileges via a crafted application     (bnc#1071470).

  - CVE-2017-13167: An elevation of privilege vulnerability     in the kernel sound timer. (bnc#1072876).

  - CVE-2017-16538: drivers/media/usb/dvb-usb-v2/lmedm04.c     in the Linux kernel allowed local users to cause a     denial of service (general protection fault and system     crash) or possibly have unspecified other impact via a     crafted USB device, related to a missing warm-start     check and incorrect attach timing     (dm04_lme2510_frontend_attach versus dm04_lme2510_tuner)     (bnc#1066569).

  - CVE-2017-17558: The usb_destroy_configuration function     in drivers/usb/core/config.c in the USB core subsystem     in the Linux kernel did not consider the maximum number     of configurations and interfaces before attempting to     release resources, which allowed local users to cause a     denial of service (out-of-bounds write access) or     possibly have unspecified other impact via a crafted USB     device (bnc#1072561).

  - CVE-2017-17450: net/netfilter/xt_osf.c in the Linux     kernel did not require the CAP_NET_ADMIN capability for     add_callback and remove_callback operations, which     allowed local users to bypass intended access     restrictions because the xt_osf_fingers data structure     is shared across all net namespaces (bnc#1071695).

  - CVE-2017-8824: The dccp_disconnect function in     net/dccp/proto.c in the Linux kernel allowed local users     to gain privileges or cause a denial of service     (use-after-free) via an AF_UNSPEC connect system call     during the DCCP_LISTEN state (bnc#1070771).

  - CVE-2017-16939: The XFRM dump policy implementation in     net/xfrm/xfrm_user.c in the Linux kernel allowed local     users to gain privileges or cause a denial of service     (use-after-free) via a crafted SO_RCVBUF setsockopt     system call in conjunction with XFRM_MSG_GETPOLICY     Netlink messages (bnc#1069702).

  - CVE-2017-15115: The sctp_do_peeloff function in     net/sctp/socket.c in the Linux kernel did not check     whether the intended netns is used in a peel-off action,     which allowed local users to cause a denial of service     (use-after-free and system crash) or possibly have     unspecified other impact via crafted system calls     (bnc#1068671).

  - CVE-2017-14106: The tcp_disconnect function in     net/ipv4/tcp.c in the Linux kernel allowed local users     to cause a denial of service (__tcp_select_window     divide-by-zero error and system crash) by triggering a     disconnect within a certain tcp_recvmsg code path     (bnc#1056982).

  - CVE-2017-11600: net/xfrm/xfrm_policy.c in the Linux     kernel through 4.12.3, when CONFIG_XFRM_MIGRATE is     enabled, did not ensure that the dir value of     xfrm_userpolicy_id is XFRM_POLICY_MAX or less, which     allowed local users to cause a denial of service     (out-of-bounds access) or possibly have unspecified     other impact via an XFRM_MSG_MIGRATE xfrm Netlink     message (bnc#1050231).

  - CVE-2017-7472: The KEYS subsystem in the Linux kernel     allowed local users to cause a denial of service (memory     consumption) via a series of     KEY_REQKEY_DEFL_THREAD_KEYRING keyctl_set_reqkey_keyring     calls (bnc#1034862).

  - CVE-2017-16534: The cdc_parse_cdc_header function in     drivers/usb/core/message.c in the Linux kernel allowed     local users to cause a denial of service (out-of-bounds     read and system crash) or possibly have unspecified     other impact via a crafted USB device (bnc#1066693).

The update package also includes non-security fixes. See advisory for details.

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Published	Updated	Severity
94537	RHEL 7 : kernel (RHSA-2016:2574)	Nessus	Red Hat Local Security Checks	11/4/2016	10/24/2019	critical
96595	RHEL 6 : MRG (RHSA-2017:0113)	Nessus	Red Hat Local Security Checks	1/18/2017	10/24/2019	critical
131845	EulerOS 2.0 SP2 : kernel (EulerOS-SA-2019-2353)	Nessus	Huawei Local Security Checks	12/10/2019	4/5/2024	critical
106095	SUSE SLES12 Security Update : kernel (SUSE-SU-2018:0115-1) (Meltdown) (Spectre)	Nessus	SuSE Local Security Checks	1/17/2018	9/10/2019	high
94547	RHEL 7 : kernel-rt (RHSA-2016:2584)	Nessus	Red Hat Local Security Checks	11/4/2016	10/24/2019	critical
199257	RHEL 5 : kernel (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	6/3/2024	10/22/2024	critical
105685	SUSE SLES11 Security Update : kernel (SUSE-SU-2018:0040-1) (BlueBorne) (KRACK) (Meltdown) (Spectre)	Nessus	SuSE Local Security Checks	1/9/2018	1/19/2021	high
95321	CentOS 7 : kernel (CESA-2016:2574)	Nessus	CentOS Local Security Checks	11/28/2016	1/4/2021	critical
105647	SUSE SLES12 Security Update : kernel (SUSE-SU-2018:0031-1) (Meltdown) (Spectre)	Nessus	SuSE Local Security Checks	1/8/2018	9/10/2019	high
105575	SUSE SLES11 Security Update : kernel (SUSE-SU-2018:0011-1) (Meltdown) (Spectre)	Nessus	SuSE Local Security Checks	1/4/2018	1/19/2021	high

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