The Linux kernel before 4.5 allows local users to bypass file-descriptor limits and cause a denial of service (memory consumption) by leveraging incorrect tracking of descriptor ownership and sending each descriptor over a UNIX socket before closing it. NOTE: this vulnerability exists because of an incorrect fix for CVE-2013-4312.

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.

According to the versions of the kernel packages installed, the EulerOS Virtualization for ARM 64 installation on the remote host is affected by the following vulnerabilities :

  - The offset2lib patch as used in the Linux Kernel     contains a vulnerability that allows a PIE binary to be     execve()'ed with 1GB of arguments or environmental     strings then the stack occupies the address 0x80000000     and the PIE binary is mapped above 0x40000000     nullifying the protection of the offset2lib patch. This     affects Linux Kernel version 4.11.5 and earlier. This     is a different issue than CVE-2017-1000371. This issue     appears to be limited to i386 based     systems.(CVE-2017-1000370i1/4%0

  - Integer overflow in the LZ4 algorithm implementation,     as used in Yann Collet LZ4 before r118 and in the     lz4_uncompress function in lib/lz4/lz4_decompress.c in     the Linux kernel before 3.15.2, on 32-bit platforms     might allow context-dependent attackers to cause a     denial of service (memory corruption) or possibly have     unspecified other impact via a crafted Literal Run that     would be improperly handled by programs not complying     with an API limitation, a different vulnerability than     CVE-2014-4715.(CVE-2014-4611i1/4%0

  - The replace_map_fd_with_map_ptr function in     kernel/bpf/verifier.c in the Linux kernel before 4.5.5     does not properly maintain an fd data structure, which     allows local users to gain privileges or cause a denial     of service (use-after-free) via crafted BPF     instructions that reference an incorrect file     descriptor.(CVE-2016-4557i1/4%0

  - The usb_destroy_configuration() function, in     'drivers/usb/core/config.c' in the USB core subsystem,     in the Linux kernel through 4.14.5 does not consider     the maximum number of configurations and interfaces     before attempting to release resources. This allows     local users to cause a denial of service, due to     out-of-bounds write access, or possibly have     unspecified other impact via a crafted USB device. Due     to the nature of the flaw, privilege escalation cannot     be fully ruled out, although we believe it is     unlikely.(CVE-2017-17558i1/4%0

  - The cdrom_ioctl_media_changed function in     drivers/cdrom/cdrom.c in the Linux kernel before 4.16.6     allows local attackers to use a incorrect bounds check     in the CDROM driver CDROM_MEDIA_CHANGED ioctl to read     out kernel memory.(CVE-2018-10940i1/4%0

  - It was found that the parse_rock_ridge_inode_internal()     function of the Linux kernel's ISOFS implementation did     not correctly check relocated directories when     processing Rock Ridge child link (CL) tags. An attacker     with physical access to the system could use a     specially crafted ISO image to crash the system or,     potentially, escalate their privileges on the     system.(CVE-2014-5471i1/4%0

  - A flaw was found in the Linux kernel's implementation     of Unix sockets. A server polling for client-socket     data could put the peer socket on a wait list the peer     socket could then close the connection, making the     reference on the wait list no longer valid. This could     lead to bypassing the permissions on a Unix socket and     packets being injected into the stream, and could also     panic the machine (denial of service).(CVE-2013-7446i1/4%0

  - The do_check function in kernel/bpf/verifier.c in the     Linux kernel before 4.11.1 does not make the     allow_ptr_leaks value available for restricting the     output of the print_bpf_insn function, which allows     local users to obtain sensitive address information via     crafted bpf system calls.(CVE-2017-9150i1/4%0

  - The WLAN (aka Wi-Fi) driver for the Linux kernel 3.x     and 4.x, as used in Qualcomm Innovation Center (QuIC)     Android contributions for MSM devices and other     products, does not verify authorization for private SET     IOCTL calls, which allows attackers to gain privileges     via a crafted application, related to     wlan_hdd_hostapd.c and     wlan_hdd_wext.c.(CVE-2015-0571i1/4%0

  - arch/arm64/kvm/guest.c in KVM in the Linux kernel     before 4.18.12 on the arm64 platform mishandles the     KVM_SET_ON_REG ioctl. This is exploitable by attackers     who can create virtual machines. An attacker can     arbitrarily redirect the hypervisor flow of control     (with full register control). An attacker can also     cause a denial of service (hypervisor panic) via an     illegal exception return. This occurs because of     insufficient restrictions on userspace access to the     core register file, and because PSTATE.M validation     does not prevent unintended execution     modes.(CVE-2018-18021i1/4%0

  - A resource-exhaustion vulnerability was found in the     kernel, where an unprivileged process could allocate     and accumulate far more file descriptors than the     process' limit. A local, unauthenticated user could     exploit this flaw by sending file descriptors over a     Unix socket and then closing them to keep the process'     fd count low, thereby creating kernel-memory or     file-descriptors exhaustion (denial of     service).(CVE-2016-2550i1/4%0

  - The Linux kernel before 3.12.4 updates certain length     values before ensuring that associated data structures     have been initialized, which allows local users to     obtain sensitive information from kernel stack memory     via a (1) recvfrom, (2) recvmmsg, or (3) recvmsg system     call, related to net/ipv4/ping.c, net/ipv4/raw.c,     net/ipv4/udp.c, net/ipv6/raw.c, and     net/ipv6/udp.c.(CVE-2013-7263i1/4%0

  - It is possible for a single process to cause an OOM     condition by filling large pipes with data that are     never read. A typical process filling 4096 pipes with 1     MB of data will use 4 GB of memory and there can be     multiple such processes, up to a     per-user-limit.(CVE-2016-2847i1/4%0

  - The __get_user_asm_ex macro in     arch/x86/include/asm/uaccess.h in the Linux kernel     before 4.7.5 does not initialize a certain integer     variable, which allows local users to obtain sensitive     information from kernel stack memory by triggering     failure of a get_user_ex call.(CVE-2016-9178i1/4%0

  - It was found that the x86 ISA (Instruction Set     Architecture) is prone to a denial of service attack     inside a virtualized environment in the form of an     infinite loop in the microcode due to the way     (sequential) delivering of benign exceptions such as     #DB (debug exception) is handled. A privileged user     inside a guest could use this flaw to create denial of     service conditions on the host kernel.(CVE-2015-8104i1/4%0

  - The Direct Rendering Manager (DRM) subsystem in the     Linux kernel through 4.x mishandles requests for     Graphics Execution Manager (GEM) objects, which allows     context-dependent attackers to cause a denial of     service (memory consumption) via an application that     processes graphics data, as demonstrated by JavaScript     code that creates many CANVAS elements for rendering by     Chrome or Firefox.(CVE-2013-7445i1/4%0

  - A flaw was found in the Linux kernel which does not     initialize certain data structures used by DMA transfer     on ARM64 based systems. This could allow local users to     obtain sensitive information from kernel memory by     triggering a dma_mmap call and reconstructing the     data.(CVE-2015-8950i1/4%0

  - A race condition was found in the Linux kernel before     version 4.11-rc1 in 'fs/timerfd.c' file which allows a     local user to cause a kernel list corruption or     use-after-free via simultaneous operations with a file     descriptor which leverage improper 'might_cancel'     queuing. An unprivileged local user could use this flaw     to cause a denial of service of the system. Due to the     nature of the flaw, privilege escalation cannot be     fully ruled out, although we believe it is     unlikely.(CVE-2017-10661i1/4%0

  - The sg_ioctl() function in 'drivers/scsi/sg.c' in the     Linux kernel, from version 4.12-rc1 to 4.14-rc2, allows     local users to obtain sensitive information from     uninitialized kernel heap-memory locations via an     SG_GET_REQUEST_TABLE ioctl call for     '/dev/sg0'.(CVE-2017-14991i1/4%0

  - A race condition in the ip4_datagram_release_cb     function in net/ipv4/datagram.c in the Linux kernel     allows local users to gain privileges or cause a denial     of service (use-after-free) by leveraging incorrect     expectations about locking during multithreaded access     to internal data structures for IPv4 UDP     sockets.(CVE-2014-9914i1/4%0

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

According to the versions of the kernel packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

  - The snd_timer_interrupt function in sound/core/timer.c     in the Linux kernel before 4.4.1 does not properly     maintain a certain linked list, which allows local     users to cause a denial of service (race condition and     system crash) via a crafted ioctl call.(CVE-2016-2545)

  - sound/core/timer.c in the Linux kernel before 4.4.1     uses an incorrect type of mutex, which allows local     users to cause a denial of service (race condition,     use-after-free, and system crash) via a crafted ioctl     call.(CVE-2016-2546)

  - sound/core/timer.c in the Linux kernel before 4.4.1     employs a locking approach that does not consider slave     timer instances, which allows local users to cause a     denial of service (race condition, use-after-free, and     system crash) via a crafted ioctl call.(CVE-2016-2547)

  - sound/core/timer.c in the Linux kernel before 4.4.1     retains certain linked lists after a close or stop     action, which allows local users to cause a denial of     service (system crash) via a crafted ioctl call,     related to the (1) snd_timer_close and (2)
    _snd_timer_stop functions.(CVE-2016-2548)

  - sound/core/hrtimer.c in the Linux kernel before 4.4.1     does not prevent recursive callback access, which     allows local users to cause a denial of service     (deadlock) via a crafted ioctl call.(CVE-2016-2549)

  - A resource-exhaustion vulnerability was found in the     kernel, where an unprivileged process could allocate     and accumulate far more file descriptors than the     process' limit. A local, unauthenticated user could     exploit this flaw by sending file descriptors over a     Unix socket and then closing them to keep the process'     fd count low, thereby creating kernel-memory or     file-descriptors exhaustion (denial of     service).(CVE-2016-2550)

  - It is possible for a single process to cause an OOM     condition by filling large pipes with data that are     never read. A typical process filling 4096 pipes with 1     MB of data will use 4 GB of memory and there can be     multiple such processes, up to a     per-user-limit.(CVE-2016-2847)

  - A security flaw was found in the Linux kernel that an     attempt to move page mapped by AIO ring buffer to the     other node triggers NULL pointer dereference at     trace_writeback_dirty_page(), because     aio_fs_backing_dev_info.dev is 0.(CVE-2016-3070)

  - A security flaw was found in the Linux kernel in the     mark_source_chains() function in     'net/ipv4/netfilter/ip_tables.c'. It is possible for a     user-supplied 'ipt_entry' structure to have a large     'next_offset' field. This field is not bounds checked     prior to writing to a counter value at the supplied     offset.(CVE-2016-3134)

  - An integer overflow vulnerability was found in the     Linux kernel in xt_alloc_table_info, which on 32-bit     systems can lead to small structure allocation and a     copy_from_user based heap corruption.(CVE-2016-3135)

  - The mct_u232_msr_to_state function in     drivers/usb/serial/mct_u232.c in the Linux kernel     before 4.5.1 allows physically proximate attackers to     cause a denial of service (NULL pointer dereference and     system crash) via a crafted USB device without two     interrupt-in endpoint descriptors.(CVE-2016-3136)

  - drivers/usb/serial/cypress_m8.c in the Linux kernel     before 4.5.1 allows physically proximate attackers to     cause a denial of service (NULL pointer dereference and     system crash) via a USB device without both an     interrupt-in and an interrupt-out endpoint descriptor,     related to the cypress_generic_port_probe and     cypress_open functions.(CVE-2016-3137)

  - The acm_probe function in drivers/usb/class/cdc-acm.c     in the Linux kernel before 4.5.1 allows physically     proximate attackers to cause a denial of service (NULL     pointer dereference and system crash) via a USB device     without both a control and a data endpoint     descriptor.(CVE-2016-3138)

  - The wacom_probe function in     drivers/input/tablet/wacom_sys.c in the Linux kernel     before 3.17 allows physically proximate attackers to     cause a denial of service (NULL pointer dereference and     system crash) via a crafted endpoints value in a USB     device descriptor.(CVE-2016-3139)

  - The digi_port_init function in     drivers/usb/serial/digi_acceleport.c in the Linux     kernel before 4.5.1 allows physically proximate     attackers to cause a denial of service (NULL pointer     dereference and system crash) via a crafted endpoints     value in a USB device descriptor.(CVE-2016-3140)

  - 'A security flaw was found in the Linux kernel's     networking subsystem that destroying the network     interface with huge number of ipv4 addresses assigned     keeps ''rtnl_lock'' spinlock for a very long time (up     to hour). This blocks many network-related operations,     including creation of new incoming ssh connections.

  - The problem is especially important for containers, as     the container owner has enough permissions to trigger     this and block a network access on a whole host,     outside the container.(CVE-2016-3156)'

  - A weakness was found in the Linux ASLR implementation.
    Any user able to running 32-bit applications in a x86     machine can disable ASLR by setting the RLIMIT_STACK     resource to unlimited.(CVE-2016-3672)

  - The ims_pcu_parse_cdc_data function in     drivers/input/misc/ims-pcu.c in the Linux kernel before     4.5.1 allows physically proximate attackers to cause a     denial of service (system crash) via a USB device     without both a master and a slave     interface.(CVE-2016-3689)

  - 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)

  - The usbip_recv_xbuff function in     drivers/usb/usbip/usbip_common.c in the Linux kernel     before 4.5.3 allows remote attackers to cause a denial     of service (out-of-bounds write) or possibly have     unspecified other impact via a crafted length value in     a USB/IP packet.(CVE-2016-3955)

  - A flaw was found in the Linux kernel's keyring handling     code: the key_reject_and_link() function could be     forced to free an arbitrary memory block. An attacker     could use this flaw to trigger a use-after-free     condition on the system, potentially allowing for     privilege escalation.(CVE-2016-4470)

  - The proc_connectinfo() function in     'drivers/usb/core/devio.c' in the Linux kernel through     4.6 does not initialize a certain data structure, which     allows local users to obtain sensitive information from     kernel stack memory via a crafted USBDEVFS_CONNECTINFO     ioctl call. The stack object 'ci' has a total size of 8     bytes. Its last 3 bytes are padding bytes which are not     initialized and are leaked to userland.(CVE-2016-4482)

  - A flaw was found in the way certain interfaces of the     Linux kernel's Infiniband subsystem used write() as     bi-directional ioctl() replacement, which could lead to     insufficient memory security checks when being invoked     using the splice() system call. A local unprivileged     user on a system with either Infiniband hardware     present or RDMA Userspace Connection Manager Access     module explicitly loaded, could use this flaw to     escalate their privileges on the system.(CVE-2016-4565)

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

The remote Ubuntu 14.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-2949-1 advisory.

    Venkatesh Pottem discovered a use-after-free vulnerability in the Linux kernel's CXGB3 driver. A local     attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.
    (CVE-2015-8812)

    Xiaofei Rex Guo discovered a timing side channel vulnerability in the Linux Extended Verification Module     (EVM). An attacker could use this to affect system integrity. (CVE-2016-2085)

    David Herrmann discovered that the Linux kernel incorrectly accounted file descriptors to the original     opener for in-flight file descriptors sent over a unix domain socket. A local attacker could use this to     cause a denial of service (resource exhaustion). (CVE-2016-2550)

    It was discovered that the Linux kernel did not enforce limits on the amount of data allocated to buffer     pipes. A local attacker could use this to cause a denial of service (resource exhaustion). (CVE-2016-2847)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 14.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-2948-1 advisory.

    Ralf Spenneberg discovered that the USB driver for Clie devices in the Linux kernel did not properly     validate the endpoints reported by the device. An attacker with physical access could cause a denial of     service (system crash). (CVE-2015-7566)

    Ralf Spenneberg discovered that the usbvision driver in the Linux kernel did not properly validate the     interfaces and endpoints reported by the device. An attacker with physical access could cause a denial of     service (system crash). (CVE-2015-7833)

    Venkatesh Pottem discovered a use-after-free vulnerability in the Linux kernel's CXGB3 driver. A local     attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.
    (CVE-2015-8812)

    It was discovered that a race condition existed in the ioctl handler for the TTY driver in the Linux     kernel. A local attacker could use this to cause a denial of service (system crash) or expose sensitive     information. (CVE-2016-0723)

    Xiaofei Rex Guo discovered a timing side channel vulnerability in the Linux Extended Verification Module     (EVM). An attacker could use this to affect system integrity. (CVE-2016-2085)

    David Herrmann discovered that the Linux kernel incorrectly accounted file descriptors to the original     opener for in-flight file descriptors sent over a unix domain socket. A local attacker could use this to     cause a denial of service (resource exhaustion). (CVE-2016-2550)

    Ralf Spenneberg discovered that the USB driver for Treo devices in the Linux kernel did not properly     validate the endpoints reported by the device. An attacker with physical access could cause a denial of     service (system crash). (CVE-2016-2782)

    It was discovered that the Linux kernel did not enforce limits on the amount of data allocated to buffer     pipes. A local attacker could use this to cause a denial of service (resource exhaustion). (CVE-2016-2847)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Ralf Spenneberg discovered that the usbvision driver in the Linux kernel did not properly sanity check the interfaces and endpoints reported by the device. An attacker with physical access could cause a denial of service (system crash). (CVE-2015-7833)

Venkatesh Pottem discovered a use-after-free vulnerability in the Linux kernel's CXGB3 driver. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.
(CVE-2015-8812)

Xiaofei Rex Guo discovered a timing side channel vulnerability in the Linux Extended Verification Module (EVM). An attacker could use this to affect system integrity. (CVE-2016-2085)

It was discovered that the extended Berkeley Packet Filter (eBPF) implementation in the Linux kernel did not correctly compute branch offsets for backward jumps after ctx expansion. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2016-2383)

David Herrmann discovered that the Linux kernel incorrectly accounted file descriptors to the original opener for in-flight file descriptors sent over a unix domain socket. A local attacker could use this to cause a denial of service (resource exhaustion). (CVE-2016-2550)

It was discovered that the Linux kernel did not enforce limits on the amount of data allocated to buffer pipes. A local attacker could use this to cause a denial of service (resource exhaustion).
(CVE-2016-2847).

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

The remote Ubuntu 14.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-2947-2 advisory.

    Ralf Spenneberg discovered that the usbvision driver in the Linux kernel did not properly validate the     interfaces and endpoints reported by the device. An attacker with physical access could cause a denial of     service (system crash). (CVE-2015-7833)

    Venkatesh Pottem discovered a use-after-free vulnerability in the Linux kernel's CXGB3 driver. A local     attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.
    (CVE-2015-8812)

    Xiaofei Rex Guo discovered a timing side channel vulnerability in the Linux Extended Verification Module     (EVM). An attacker could use this to affect system integrity. (CVE-2016-2085)

    It was discovered that the extended Berkeley Packet Filter (eBPF) implementation in the Linux kernel did     not correctly compute branch offsets for backward jumps after ctx expansion. A local attacker could use     this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2016-2383)

    David Herrmann discovered that the Linux kernel incorrectly accounted file descriptors to the original     opener for in-flight file descriptors sent over a unix domain socket. A local attacker could use this to     cause a denial of service (resource exhaustion). (CVE-2016-2550)

    It was discovered that the Linux kernel did not enforce limits on the amount of data allocated to buffer     pipes. A local attacker could use this to cause a denial of service (resource exhaustion). (CVE-2016-2847)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Venkatesh Pottem discovered a use-after-free vulnerability in the Linux kernel's CXGB3 driver. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.
(CVE-2015-8812)

Xiaofei Rex Guo discovered a timing side channel vulnerability in the Linux Extended Verification Module (EVM). An attacker could use this to affect system integrity. (CVE-2016-2085)

David Herrmann discovered that the Linux kernel incorrectly accounted file descriptors to the original opener for in-flight file descriptors sent over a unix domain socket. A local attacker could use this to cause a denial of service (resource exhaustion). (CVE-2016-2550)

It was discovered that the Linux kernel did not enforce limits on the amount of data allocated to buffer pipes. A local attacker could use this to cause a denial of service (resource exhaustion).
(CVE-2016-2847).

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

The remote Ubuntu 14.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-2946-1 advisory.

    Venkatesh Pottem discovered a use-after-free vulnerability in the Linux kernel's CXGB3 driver. A local     attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.
    (CVE-2015-8812)

    Xiaofei Rex Guo discovered a timing side channel vulnerability in the Linux Extended Verification Module     (EVM). An attacker could use this to affect system integrity. (CVE-2016-2085)

    David Herrmann discovered that the Linux kernel incorrectly accounted file descriptors to the original     opener for in-flight file descriptors sent over a unix domain socket. A local attacker could use this to     cause a denial of service (resource exhaustion). (CVE-2016-2550)

    It was discovered that the Linux kernel did not enforce limits on the amount of data allocated to buffer     pipes. A local attacker could use this to cause a denial of service (resource exhaustion). (CVE-2016-2847)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

When running as a Xen 64-bit PV guest, user mode processes not supposed to be able to access I/O ports may be granted such permission, potentially resulting in one or more of in-guest privilege escalation, guest crashes (Denial of Service), or in-guest information leaks. (CVE-2016-3157)

In some cases, the kernel did not correctly fix backward jumps in a new eBPF program, which could allow arbitrary reads. (CVE-2016-2383)

The kernel incorrectly accounted for the number of in-flight fds over a unix domain socket to the original opener of the file descriptor.
Another process could arbitrarily deplete the original file opener's maximum open files resource limit. (CVE-2016-2550)

A resource-exhaustion vulnerability was found in the kernel, where an unprivileged process could allocate and accumulate far more file descriptors than the process' limit. A local, unauthenticated user could exploit this flaw by sending file descriptors over a Unix socket and then closing them to keep the process' fd count low, thereby creating kernel-memory or file-descriptors exhaustion (denial of service). (CVE-2016-2847)

The 4.4.3 update contains a number of important fixes across the tree

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

Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service, information leak or data loss.

  - CVE-2013-4312, CVE-2016-2847     Tetsuo Handa discovered that users can use pipes queued     on local (Unix) sockets to allocate an unfair share of     kernel memory, leading to denial-of-service (resource     exhaustion).

  This issue was previously mitigated for the stable suite by limiting   the total number of files queued by each user on local sockets. The   new kernel version in both suites includes that mitigation plus   limits on the total size of pipe buffers allocated for each user.

  - CVE-2015-7566     Ralf Spenneberg of OpenSource Security reported that the     visor driver crashes when a specially crafted USB device     without bulk-out endpoint is detected.

  - CVE-2015-8767     An SCTP denial-of-service was discovered which can be     triggered by a local attacker during a heartbeat timeout     event after the 4-way handshake.

  - CVE-2015-8785     It was discovered that local users permitted to write to     a file on a FUSE filesystem could cause a denial of     service (unkillable loop in the kernel).

  - CVE-2015-8812     A flaw was found in the iw_cxgb3 Infiniband driver.
    Whenever it could not send a packet because the network     was congested, it would free the packet buffer but later     attempt to send the packet again. This use-after-free     could result in a denial of service (crash or hang),     data loss or privilege escalation.

  - CVE-2015-8816     A use-after-free vulnerability was discovered in the USB     hub driver. This may be used by a physically present     user for privilege escalation.

  - CVE-2015-8830     Ben Hawkes of Google Project Zero reported that the AIO     interface permitted reading or writing 2 GiB of data or     more in a single chunk, which could lead to an integer     overflow when applied to certain filesystems, socket or     device types. The full security impact has not been     evaluated.

  - CVE-2016-0723     A use-after-free vulnerability was discovered in the     TIOCGETD ioctl. A local attacker could use this flaw for     denial-of-service.

  - CVE-2016-0774     It was found that the fix for CVE-2015-1805 in kernel     versions older than Linux 3.16 did not correctly handle     the case of a partially failed atomic read. A local,     unprivileged user could use this flaw to crash the     system or leak kernel memory to user space.

  - CVE-2016-2069     Andy Lutomirski discovered a race condition in flushing     of the TLB when switching tasks on an x86 system. On an     SMP system this could possibly lead to a crash,     information leak or privilege escalation.

  - CVE-2016-2384     Andrey Konovalov found that a crafted USB MIDI device     with an invalid USB descriptor could trigger a     double-free. This may be used by a physically present     user for privilege escalation.

  - CVE-2016-2543     Dmitry Vyukov found that the core sound sequencer driver     (snd-seq) lacked a necessary check for a NULL pointer,     allowing a user with access to a sound sequencer device     to cause a denial-of service (crash).

  - CVE-2016-2544, CVE-2016-2546, CVE-2016-2547,     CVE-2016-2548

    Dmitry Vyukov found various race conditions in the sound     subsystem (ALSA)'s management of timers. A user with     access to sound devices could use these to cause a     denial-of-service (crash or hang) or possibly for     privilege escalation.

  - CVE-2016-2545     Dmitry Vyukov found a flaw in list manipulation in the     sound subsystem (ALSA)'s management of timers. A user     with access to sound devices could use this to cause a     denial-of-service (crash or hang) or possibly for     privilege escalation.

  - CVE-2016-2549     Dmitry Vyukov found a potential deadlock in the sound     subsystem (ALSA)'s use of high resolution timers. A user     with access to sound devices could use this to cause a     denial-of-service (hang).

  - CVE-2016-2550     The original mitigation of CVE-2013-4312, limiting the     total number of files a user could queue on local     sockets, was flawed. A user given a local socket opened     by another user, for example through the systemd socket     activation mechanism, could make use of the other user's     quota, again leading to a denial-of-service (resource     exhaustion). This is fixed by accounting queued files to     the sender rather than the socket opener.

ID	Name	Product	Family	Severity
199257	RHEL 5 : kernel (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	critical
124989	EulerOS Virtualization for ARM 64 3.0.1.0 : kernel (EulerOS-SA-2019-1536)	Nessus	Huawei Local Security Checks	high
124816	EulerOS Virtualization 3.0.1.0 : kernel (EulerOS-SA-2019-1492)	Nessus	Huawei Local Security Checks	critical
90406	Ubuntu 14.04 LTS : Linux kernel (Vivid HWE) vulnerabilities (USN-2949-1)	Nessus	Ubuntu Local Security Checks	critical
90405	Ubuntu 14.04 LTS : Linux kernel (Utopic HWE) vulnerabilities (USN-2948-1)	Nessus	Ubuntu Local Security Checks	critical
90404	Ubuntu 15.10 : linux-raspi2 vulnerabilities (USN-2947-3)	Nessus	Ubuntu Local Security Checks	critical
90403	Ubuntu 14.04 LTS : Linux kernel (Wily HWE) vulnerabilities (USN-2947-2)	Nessus	Ubuntu Local Security Checks	critical
90402	Ubuntu 15.10 : linux vulnerabilities (USN-2947-1)	Nessus	Ubuntu Local Security Checks	critical
90401	Ubuntu 12.04 LTS : linux-lts-trusty vulnerabilities (USN-2946-2)	Nessus	Ubuntu Local Security Checks	critical
90400	Ubuntu 14.04 LTS : Linux kernel vulnerabilities (USN-2946-1)	Nessus	Ubuntu Local Security Checks	critical
89966	Amazon Linux AMI : kernel (ALAS-2016-669)	Nessus	Amazon Linux Local Security Checks	high
89482	Fedora 23 : kernel-4.4.3-300.fc23 (2016-1642a20327)	Nessus	Fedora Local Security Checks	medium
89122	Debian DSA-3503-1 : linux - security update	Nessus	Debian Local Security Checks	critical

Detections

Analytics

CVE-2016-2550

medium

Tenable Plugins

critical

high

critical

critical

critical

critical

critical

critical

critical

critical

high

medium

critical