Buffer overflow in virt/kvm/irq_comm.c in the KVM subsystem in the Linux kernel before 3.2.24 allows local users to cause a denial of service (crash) and possibly execute arbitrary code via vectors related to Message Signaled Interrupts (MSI), irq routing entries, and an incorrect check by the setup_routing_entry function before invoking the kvm_set_irq function.

The remote OracleVM system is missing necessary patches to address critical security updates :

  - Fix bug number for commit 'cciss: Update HPSA_BOUNDARY'     (Joe Jin) [Orabug: 14681166]

  - cciss: Update HPSA_BOUNDARY. (Joe Jin) [Orabug:
    14319765]

  - KVM: introduce kvm_for_each_memslot macro (Maxim Uvarov)     [Bugdb: 13966]

  - dl2k: Clean up rio_ioctl (Jeff Mahoney) [Orabug:
    14126896] (CVE-2012-2313)

  - NFSv4: include bitmap in nfsv4 get acl data (Andy     Adamson) (CVE-2011-4131)

  - KVM: Fix buffer overflow in kvm_set_irq (Avi Kivity)     [Bugdb: 13966] (CVE-2012-2137)

  - net: sock: validate data_len before allocating skb in     sock_alloc_send_pskb (Jason Wang) [Bugdb: 13966]     (CVE-2012-2136)

  - mm: pmd_read_atomic: fix 32bit PAE pmd walk vs     pmd_populate SMP race condition (Andrea Arcangeli)     [Bugdb: 13966] (CVE-2012-2373)

  - KVM: lock slots_lock around device assignment (Alex     Williamson) [Bugdb: 13966] (CVE-2012-2121)

  - KVM: unmap pages from the iommu when slots are removed     (Maxim Uvarov) [Bugdb: 13966] (CVE-2012-2121)

  - fcaps: clear the same personality flags as suid when     fcaps are used (Eric Paris) [Bugdb: 13966]     (CVE-2012-2123)

  - tilegx: enable SYSCALL_WRAPPERS support (Chris Metcalf)     (CVE-2009-0029)

  - drm/i915: fix integer overflow in i915_gem_do_execbuffer     (Xi Wang) [Orabug: 14107456] (CVE-2012-2384)

  - drm/i915: fix integer overflow in i915_gem_execbuffer2     (Xi Wang) [Orabug: 14107445] (CVE-2012-2383)

  - [dm] do not forward ioctls from logical volumes to the     underlying device (Joe Jin) (CVE-2011-4127)

  - [block] fail SCSI passthrough ioctls on partition     devices (Joe Jin) (CVE-2011-4127)

  - [block] add and use scsi_blk_cmd_ioctl (Joe Jin)     [Orabug: 14056755] (CVE-2011-4127)

  - KVM: Ensure all vcpus are consistent with in-kernel     irqchip settings (Avi Kivity) [Bugdb: 13871]     (CVE-2012-1601)

  - regset: Return -EFAULT, not -EIO, on host-side memory     fault (H. Peter Anvin) (CVE-2012-1097)

  - regset: Prevent null pointer reference on readonly     regsets (H. Peter Anvin) (CVE-2012-1097)

  - cifs: fix dentry refcount leak when opening a FIFO on     lookup (Jeff Layton) (CVE-2012-1090)

  - mm: thp: fix pmd_bad triggering in code paths holding     mmap_sem read mode (Andrea Arcangeli) (CVE-2012-1179)

  - ext4: fix undefined behavior in ext4_fill_flex_info (Xi     Wang) (CVE-2009-4307)

  - ocfs2: clear unaligned io flag when dio fails (Junxiao     Bi) [Orabug: 14063941]

  - aio: make kiocb->private NUll in init_sync_kiocb     (Junxiao Bi) [Orabug: 14063941]

  - igb: Fix for Alt MAC Address feature on 82580 and later     devices (Carolyn Wyborny) [Orabug: 14258706]

  - igb: Alternate MAC Address Updates for Func2&3 (Akeem G.
    Abodunrin) [Orabug: 14258706]

  - igb: Alternate MAC Address EEPROM Updates (Akeem G.
    Abodunrin) [Orabug: 14258706]

  - cciss: only enable cciss_allow_hpsa when for ol5 (Joe     Jin) [Orabug: 14106006]

  - Revert 'cciss: remove controllers supported by hpsa'     (Joe Jin) [Orabug: 14106006]

  - [scsi] hpsa: add all support devices for ol5 (Joe Jin)     [Orabug: 14106006]

  - Disable VLAN 0 tagging for none VLAN traffic (Adnan     Misherfi) [Orabug: 14406424]

  - x86: Add Xen kexec control code size check to linker     script (Daniel Kiper)

  - drivers/xen: Export vmcoreinfo through sysfs (Daniel     Kiper)

  - x86/xen/enlighten: Add init and crash kexec/kdump hooks     (Maxim Uvarov)

  - x86/xen: Add kexec/kdump makefile rules (Daniel Kiper)

  - x86/xen: Add x86_64 kexec/kdump implementation (Daniel     Kiper)

  - x86/xen: Add placeholder for i386 kexec/kdump     implementation (Daniel Kiper)

  - x86/xen: Register resources required by kexec-tools     (Daniel Kiper)

  - x86/xen: Introduce architecture dependent data for     kexec/kdump (Daniel Kiper)

  - xen: Introduce architecture independent data for     kexec/kdump (Daniel Kiper)

  - x86/kexec: Add extra pointers to transition page table     PGD, PUD, PMD and PTE (Daniel Kiper)

  - kexec: introduce kexec_ops struct (Daniel Kiper)

  - SPEC: replace DEFAULTKERNEL from kernel-ovs to     kernel-uek

Multiple vulnerabilities has been found and corrected in the Linux kernel :

kernel/auditsc.c in the Linux kernel through 3.14.5, when CONFIG_AUDITSYSCALL is enabled with certain syscall rules, allows local users to obtain potentially sensitive single-bit values from kernel memory or cause a denial of service (OOPS) via a large value of a syscall number (CVE-2014-3917).

The futex_requeue function in kernel/futex.c in the Linux kernel through 3.14.5 does not ensure that calls have two different futex addresses, which allows local users to gain privileges via a crafted FUTEX_REQUEUE command that facilitates unsafe waiter modification (CVE-2014-3153).

Race condition in the ath_tx_aggr_sleep function in drivers/net/wireless/ath/ath9k/xmit.c in the Linux kernel before 3.13.7 allows remote attackers to cause a denial of service (system crash) via a large amount of network traffic that triggers certain list deletions (CVE-2014-2672).

The (1) BPF_S_ANC_NLATTR and (2) BPF_S_ANC_NLATTR_NEST extension implementations in the sk_run_filter function in net/core/filter.c in the Linux kernel through 3.14.3 do not check whether a certain length value is sufficiently large, which allows local users to cause a denial of service (integer underflow and system crash) via crafted BPF instructions. NOTE: the affected code was moved to the
__skb_get_nlattr and __skb_get_nlattr_nest functions before the vulnerability was announced (CVE-2014-3144).

The BPF_S_ANC_NLATTR_NEST extension implementation in the sk_run_filter function in net/core/filter.c in the Linux kernel through 3.14.3 uses the reverse order in a certain subtraction, which allows local users to cause a denial of service (over-read and system crash) via crafted BPF instructions. NOTE: the affected code was moved to the __skb_get_nlattr_nest function before the vulnerability was announced (CVE-2014-3145).

Integer overflow in the ping_init_sock function in net/ipv4/ping.c in the Linux kernel through 3.14.1 allows local users to cause a denial of service (use-after-free and system crash) or possibly gain privileges via a crafted application that leverages an improperly managed reference counter (CVE-2014-2851).

The n_tty_write function in drivers/tty/n_tty.c in the Linux kernel through 3.14.3 does not properly manage tty driver access in the LECHO !OPOST case, which allows local users to cause a denial of service (memory corruption and system crash) or gain privileges by triggering a race condition involving read and write operations with long strings (CVE-2014-0196).

The raw_cmd_copyout function in drivers/block/floppy.c in the Linux kernel through 3.14.3 does not properly restrict access to certain pointers during processing of an FDRAWCMD ioctl call, which allows local users to obtain sensitive information from kernel heap memory by leveraging write access to a /dev/fd device (CVE-2014-1738).

The raw_cmd_copyin function in drivers/block/floppy.c in the Linux kernel through 3.14.3 does not properly handle error conditions during processing of an FDRAWCMD ioctl call, which allows local users to trigger kfree operations and gain privileges by leveraging write access to a /dev/fd device (CVE-2014-1737).

The rds_iw_laddr_check function in net/rds/iw.c in the Linux kernel through 3.14 allows local users to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact via a bind system call for an RDS socket on a system that lacks RDS transports (CVE-2014-2678).

drivers/vhost/net.c in the Linux kernel before 3.13.10, when mergeable buffers are disabled, does not properly validate packet lengths, which allows guest OS users to cause a denial of service (memory corruption and host OS crash) or possibly gain privileges on the host OS via crafted packets, related to the handle_rx and get_rx_bufs functions (CVE-2014-0077).

The ip6_route_add function in net/ipv6/route.c in the Linux kernel through 3.13.6 does not properly count the addition of routes, which allows remote attackers to cause a denial of service (memory consumption) via a flood of ICMPv6 Router Advertisement packets (CVE-2014-2309).

Multiple array index errors in drivers/hid/hid-multitouch.c in the Human Interface Device (HID) subsystem in the Linux kernel through 3.11, when CONFIG_HID_MULTITOUCH is enabled, allow physically proximate attackers to cause a denial of service (heap memory corruption, or NULL pointer dereference and OOPS) via a crafted device (CVE-2013-2897).

net/netfilter/nf_conntrack_proto_dccp.c in the Linux kernel through 3.13.6 uses a DCCP header pointer incorrectly, which allows remote attackers to cause a denial of service (system crash) or possibly execute arbitrary code via a DCCP packet that triggers a call to the (1) dccp_new, (2) dccp_packet, or (3) dccp_error function (CVE-2014-2523).

Race condition in the mac80211 subsystem in the Linux kernel before 3.13.7 allows remote attackers to cause a denial of service (system crash) via network traffic that improperly interacts with the WLAN_STA_PS_STA state (aka power-save mode), related to sta_info.c and tx.c (CVE-2014-2706).

The sctp_sf_do_5_1D_ce function in net/sctp/sm_statefuns.c in the Linux kernel through 3.13.6 does not validate certain auth_enable and auth_capable fields before making an sctp_sf_authenticate call, which allows remote attackers to cause a denial of service (NULL pointer dereference and system crash) via an SCTP handshake with a modified INIT chunk and a crafted AUTH chunk before a COOKIE_ECHO chunk (CVE-2014-0101).

The cifs_iovec_write function in fs/cifs/file.c in the Linux kernel through 3.13.5 does not properly handle uncached write operations that copy fewer than the requested number of bytes, which allows local users to obtain sensitive information from kernel memory, cause a denial of service (memory corruption and system crash), or possibly gain privileges via a writev system call with a crafted pointer (CVE-2014-0069).

arch/s390/kernel/head64.S in the Linux kernel before 3.13.5 on the s390 platform does not properly handle attempted use of the linkage stack, which allows local users to cause a denial of service (system crash) by executing a crafted instruction (CVE-2014-2039).

Buffer overflow in virt/kvm/irq_comm.c in the KVM subsystem in the Linux kernel before 3.2.24 allows local users to cause a denial of service (crash) and possibly execute arbitrary code via vectors related to Message Signaled Interrupts (MSI), irq routing entries, and an incorrect check by the setup_routing_entry function before invoking the kvm_set_irq function (CVE-2012-2137).

The security_context_to_sid_core function in security/selinux/ss/services.c in the Linux kernel before 3.13.4 allows local users to cause a denial of service (system crash) by leveraging the CAP_MAC_ADMIN capability to set a zero-length security context (CVE-2014-1874).

The updated packages provides a solution for these security issues.

Description of changes:

* CVE-2012-2123: Privilege escalation when assigning permissions using fcaps.

If a process increases permissions using fcaps, all of the dangerous personality flags which are cleared for suid apps are not cleared. This has allowed programs that gained elevated permissions using fcaps to disable the address space randomization of other processes.


* CVE-2012-2121: Memory leak in KVM device assignment.

KVM uses memory slots to track and map guest regions of memory.  When device assignment is used, the pages backing these slots are pinned in memory and mapped into the iommu.  The problem is that when a memory slot is destroyed the pages for the associated memory slot are neither unpinned nor unmapped from the iommu.


* Memory corruption in KVM device assignment slot handling.

A race condition in the KVM device assignment slot handling caused by missing locks around the unmapping of memory slots could cause a memory corruption.


* CVE-2012-2136: Privilege escalation in TUN/TAP virtual device.

The length of packet fragments to be sent wasn't validated before use, leading to heap overflow. A user having access to TUN/TAP virtual device could use this flaw to crash the system or to potentially escalate their privileges.


* CVE-2012-2137: Buffer overflow in KVM MSI routing entry handler.

A buffer overflow flaw was found in the setup_routing_entry() function in the KVM subsystem of the Linux kernel in the way the Message Signaled Interrupts (MSI) routing entry was handled. A local, unprivileged user could use this flaw to cause a denial of service or, possibly, escalate their privileges.


* CVE-2012-1179 and CVE-2012-2373: Hugepage denial of service.

CVE-2012-1179: Denial of service in page mapping of the hugepage subsystem.

In some cases, the hugepage subsystem would allocate new PMDs when not expected by the memory management subsystem. A privileged user in the KVM guest can use this flaw to crash the host, an unprivileged local user could use this flaw to crash the system.

CVE-2012-2373: Denial of service in PAE page tables.

On a PAE system, a non-atomic load could be corrupted by a page fault resulting in a kernel crash, triggerable by an unprivileged user.


* Regression in handling of bind() with AF_UNSPEC family sockets.

Legacy applications used to bind() with AF_UNSPEC instead of AF_INET. Allow them to continue doing so, but verify that the address is indeed INADDR_ANY.


[2.6.39-100.10.1.el6uek]
- thp: avoid atomic64_read in pmd_read_atomic for 32bit PAE (Andrea Arcangeli)    [Orabug: 14217003]

[2.6.39-100.9.1.el6uek]
- mm: pmd_read_atomic: fix 32bit PAE pmd walk vs pmd_populate SMP race    condition (Andrea Arcangeli) [Bugdb: 13966] {CVE-2012-2373}
- mm: thp: fix pmd_bad() triggering in code paths holding mmap_sem read mode    (Andrea Arcangeli)  {CVE-2012-1179}
- KVM: Fix buffer overflow in kvm_set_irq() (Avi Kivity) [Bugdb: 13966]    {CVE-2012-2137}
- net: sock: validate data_len before allocating skb in sock_alloc_send_pskb()    (Jason Wang) [Bugdb: 13966] {CVE-2012-2136}
- KVM: lock slots_lock around device assignment (Alex Williamson) [Bugdb:
   13966] {CVE-2012-2121}
- KVM: unmap pages from the iommu when slots are removed (Alex Williamson)    [Bugdb: 13966] {CVE-2012-2121}
- KVM: introduce kvm_for_each_memslot macro (Xiao Guangrong) [Bugdb: 13966]
- fcaps: clear the same personality flags as suid when fcaps are used (Eric    Paris) [Bugdb: 13966] {CVE-2012-2123}

[2.6.39-100.8.1.el6uek]
- net: ipv4: relax AF_INET check in bind() (Eric Dumazet) [Orabug: 14054411]

The remote Oracle Linux 5 / 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2012-2020 advisory.

  - The sock_alloc_send_pskb function in net/core/sock.c in the Linux kernel before 3.4.5 does not properly     validate a certain length value, which allows local users to cause a denial of service (heap-based buffer     overflow and system crash) or possibly gain privileges by leveraging access to a TUN/TAP device.
    (CVE-2012-2136)

  - The cap_bprm_set_creds function in security/commoncap.c in the Linux kernel before 3.3.3 does not properly     handle the use of file system capabilities (aka fcaps) for implementing a privileged executable file,     which allows local users to bypass intended personality restrictions via a crafted application, as     demonstrated by an attack that uses a parent process to disable ASLR. (CVE-2012-2123)

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

The remote Oracle Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2012-0743 advisory.

  - The KVM implementation in the Linux kernel before 3.3.4 does not properly manage the relationships between     memory slots and the iommu, which allows guest OS users to cause a denial of service (memory leak and host     OS crash) by leveraging administrative access to the guest OS to conduct hotunplug and hotplug operations     on devices. (CVE-2012-2121)

  - The sock_alloc_send_pskb function in net/core/sock.c in the Linux kernel before 3.4.5 does not properly     validate a certain length value, which allows local users to cause a denial of service (heap-based buffer     overflow and system crash) or possibly gain privileges by leveraging access to a TUN/TAP device.
    (CVE-2012-2136)

  - Integer overflow in the drm_mode_dirtyfb_ioctl function in drivers/gpu/drm/drm_crtc.c in the Direct     Rendering Manager (DRM) subsystem in the Linux kernel before 3.1.5 allows local users to gain privileges     or cause a denial of service (memory corruption) via a crafted ioctl call. (CVE-2012-0044)

  - The Linux kernel before 3.3.1, when KVM is used, allows guest OS users to cause a denial of service (host     OS crash) by leveraging administrative access to the guest OS, related to the pmd_none_or_clear_bad     function and page faults for huge pages. (CVE-2012-1179)

  - Buffer overflow in the macvtap device driver in the Linux kernel before 3.4.5, when running in certain     configurations, allows privileged KVM guest users to cause a denial of service (crash) via a long     descriptor with a long vector length. (CVE-2012-2119)

  - The cap_bprm_set_creds function in security/commoncap.c in the Linux kernel before 3.3.3 does not properly     handle the use of file system capabilities (aka fcaps) for implementing a privileged executable file,     which allows local users to bypass intended personality restrictions via a crafted application, as     demonstrated by an attack that uses a parent process to disable ASLR. (CVE-2012-2123)

  - Buffer overflow in virt/kvm/irq_comm.c in the KVM subsystem in the Linux kernel before 3.2.24 allows local     users to cause a denial of service (crash) and possibly execute arbitrary code via vectors related to     Message Signaled Interrupts (MSI), irq routing entries, and an incorrect check by the setup_routing_entry     function before invoking the kvm_set_irq function. (CVE-2012-2137)

  - The rds_ib_xmit function in net/rds/ib_send.c in the Reliable Datagram Sockets (RDS) protocol     implementation in the Linux kernel 3.7.4 and earlier allows local users to cause a denial of service     (BUG_ON and kernel panic) by establishing an RDS connection with the source IP address equal to the IPoIB     interface's own IP address, as demonstrated by rds-ping. (CVE-2012-2372)

  - The Linux kernel before 3.4.5 on the x86 platform, when Physical Address Extension (PAE) is enabled, does     not properly use the Page Middle Directory (PMD), which allows local users to cause a denial of service     (panic) via a crafted application that triggers a race condition. (CVE-2012-2373)

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

A flaw was found in how the Linux kernel's KVM (Kernel-based Virtual Machine) subsystem handled MSI (Message Signaled Interrupts). A local unprivileged user could exploit this flaw to cause a denial of service or potentially elevate privileges.

Vadim Ponomarev discovered a flaw in the Linux kernel causing a reference leak when PID namespaces are used. A remote attacker could exploit this flaw causing a denial of service. (CVE-2012-2127)

A flaw was found in how the Linux kernel's KVM (Kernel-based Virtual Machine) subsystem handled MSI (Message Signaled Interrupts). A local unprivileged user could exploit this flaw to cause a denial of service or potentially elevate privileges. (CVE-2012-2137).

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.

A flaw was found in how the Linux kernel's KVM (Kernel-based Virtual Machine) subsystem handled MSI (Message Signaled Interrupts). A local unprivileged user could exploit this flaw to cause a denial of service or potentially elevate privileges. (CVE-2012-2137)

A flaw was found in how the Linux kernel passed the replacement session keyring to a child process. An unprivileged local user could exploit this flaw to cause a denial of service (panic).
(CVE-2012-2745).

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.

A flaw was discovered in the Linux kernel's macvtap device driver, which is used in KVM (Kernel-based Virtual Machine) to create a network bridge between host and guest. A privleged user in a guest could exploit this flaw to crash the host, if the vhost_net module is loaded with the experimental_zcopytx option enabled. (CVE-2012-2119)

An error was discovered in the Linux kernel's network TUN/TAP device implementation. A local user with access to the TUN/TAP interface (which is not available to unprivileged users until granted by a root user) could exploit this flaw to crash the system or potential gain administrative privileges. (CVE-2012-2136)

A flaw was found in how the Linux kernel's KVM (Kernel-based Virtual Machine) subsystem handled MSI (Message Signaled Interrupts). A local unprivileged user could exploit this flaw to cause a denial of service or potentially elevate privileges. (CVE-2012-2137)

A flaw was found in the Linux kernel's Reliable Datagram Sockets (RDS) protocol implementation. A local, unprivileged user could use this flaw to cause a denial of service. (CVE-2012-2372)

Ulrich Obergfell discovered an error in the Linux kernel's memory management subsystem on 32 bit PAE systems with more than 4GB of memory installed. A local unprivileged user could exploit this flaw to crash the system. (CVE-2012-2373)

Dan Rosenberg discovered flaws in the Linux kernel's NCI (Near Field Communication Controller Interface). A remote attacker could exploit these flaws to crash the system or potentially execute privileged code. (CVE-2012-3364)

A flaw was discovered in the Linux kernel's epoll system call. An unprivileged local user could use this flaw to crash the system.
(CVE-2012-3375)

Some errors where discovered in the Linux kernel's UDF file system, which is used to mount some CD-ROMs and DVDs. An unprivileged local user could use these flaws to crash the system. (CVE-2012-3400)

A flaw was discovered in the madvise feature of the Linux kernel's memory subsystem. An unprivileged local use could exploit the flaw to cause a denial of service (crash the system). (CVE-2012-3511).

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.

A flaw was discovered in the Linux kernel's macvtap device driver, which is used in KVM (Kernel-based Virtual Machine) to create a network bridge between host and guest. A privleged user in a guest could exploit this flaw to crash the host, if the vhost_net module is loaded with the experimental_zcopytx option enabled. (CVE-2012-2119)

An error was discovered in the Linux kernel's network TUN/TAP device implementation. A local user with access to the TUN/TAP interface (which is not available to unprivileged users until granted by a root user) could exploit this flaw to crash the system or potential gain administrative privileges. (CVE-2012-2136)

A flaw was found in how the Linux kernel's KVM (Kernel-based Virtual Machine) subsystem handled MSI (Message Signaled Interrupts). A local unprivileged user could exploit this flaw to cause a denial of service or potentially elevate privileges. (CVE-2012-2137)

A flaw was found in the Linux kernel's Reliable Datagram Sockets (RDS) protocol implementation. A local, unprivileged user could use this flaw to cause a denial of service. (CVE-2012-2372)

Ulrich Obergfell discovered an error in the Linux kernel's memory management subsystem on 32 bit PAE systems with more than 4GB of memory installed. A local unprivileged user could exploit this flaw to crash the system. (CVE-2012-2373)

Dan Rosenberg discovered flaws in the Linux kernel's NCI (Near Field Communication Controller Interface). A remote attacker could exploit these flaws to crash the system or potentially execute privileged code. (CVE-2012-3364)

A flaw was discovered in the Linux kernel's epoll system call. An unprivileged local user could use this flaw to crash the system.
(CVE-2012-3375)

Some errors where discovered in the Linux kernel's UDF file system, which is used to mount some CD-ROMs and DVDs. An unprivileged local user could use these flaws to crash the system. (CVE-2012-3400)

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

This update fixes the following security issues :

  - A local, unprivileged user could use an integer overflow     flaw in drm_mode_dirtyfb_ioctl() to cause a denial of     service or escalate their privileges. (CVE-2012-0044,     Important)

  - A buffer overflow flaw was found in the macvtap device     driver, used for creating a bridged network between the     guest and the host in KVM (Kernel-based Virtual Machine)     environments. A privileged guest user in a KVM guest     could use this flaw to crash the host. Note: This issue     only affected hosts that have the vhost_net module     loaded with the experimental_zcopytx module option     enabled (it is not enabled by default), and that also     have macvtap configured for at least one guest.
    (CVE-2012-2119, Important)

  - When a set user ID (setuid) application is executed,     certain personality flags for controlling the     application's behavior are cleared (that is, a     privileged application will not be affected by those     flags). It was found that those flags were not cleared     if the application was made privileged via file system     capabilities. A local, unprivileged user could use this     flaw to change the behavior of such applications,     allowing them to bypass intended restrictions. Note that     for default installations, no application shipped by us     for Scientific Linux is made privileged via file system     capabilities. (CVE-2012-2123, Important)

  - It was found that the data_len parameter of the     sock_alloc_send_pskb() function in the Linux kernel's     networking implementation was not validated before use.
    A privileged guest user in a KVM guest could use this     flaw to crash the host or, possibly, escalate their     privileges on the host. (CVE-2012-2136, Important)

  - A buffer overflow flaw was found in the     setup_routing_entry() function in the KVM subsystem of     the Linux kernel in the way the Message Signaled     Interrupts (MSI) routing entry was handled. A local,     unprivileged user could use this flaw to cause a denial     of service or, possibly, escalate their privileges.
    (CVE-2012-2137, Important)

  - A race condition was found in the Linux kernel's memory     management subsystem in the way pmd_none_or_clear_bad(),     when called with mmap_sem in read mode, and Transparent     Huge Pages (THP) page faults interacted. A privileged     user in a KVM guest with the ballooning functionality     enabled could potentially use this flaw to crash the     host. A local, unprivileged user could use this flaw to     crash the system. (CVE-2012-1179, Moderate)

  - A flaw was found in the way device memory was handled     during guest device removal. Upon successful device     removal, memory used by the device was not properly     unmapped from the corresponding IOMMU or properly     released from the kernel, leading to a memory leak. A     malicious user on a KVM host who has the ability to     assign a device to a guest could use this flaw to crash     the host. (CVE-2012-2121, Moderate)

  - A flaw was found in the Linux kernel's Reliable Datagram     Sockets (RDS) protocol implementation. A local,     unprivileged user could use this flaw to cause a denial     of service. (CVE-2012-2372, Moderate)

  - A race condition was found in the Linux kernel's memory     management subsystem in the way pmd_populate() and     pte_offset_map_lock() interacted on 32-bit x86 systems     with more than 4GB of RAM. A local, unprivileged user     could use this flaw to cause a denial of service.
    (CVE-2012-2373, Moderate)

This update also fixes several bugs.

Users should upgrade to these updated packages, which contain backported patches to correct these issues. The system must be rebooted for this update to take effect.

Updated kernel packages that fix multiple security issues and several bugs are now available for Red Hat Enterprise Linux 6.

The Red Hat Security Response Team has rated this update as having important security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

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

This update fixes the following security issues :

* A local, unprivileged user could use an integer overflow flaw in drm_mode_dirtyfb_ioctl() to cause a denial of service or escalate their privileges. (CVE-2012-0044, Important)

* A buffer overflow flaw was found in the macvtap device driver, used for creating a bridged network between the guest and the host in KVM (Kernel-based Virtual Machine) environments. A privileged guest user in a KVM guest could use this flaw to crash the host. Note: This issue only affected hosts that have the vhost_net module loaded with the experimental_zcopytx module option enabled (it is not enabled by default), and that also have macvtap configured for at least one guest. (CVE-2012-2119, Important)

* When a set user ID (setuid) application is executed, certain personality flags for controlling the application's behavior are cleared (that is, a privileged application will not be affected by those flags). It was found that those flags were not cleared if the application was made privileged via file system capabilities. A local, unprivileged user could use this flaw to change the behavior of such applications, allowing them to bypass intended restrictions. Note that for default installations, no application shipped by Red Hat for Red Hat Enterprise Linux is made privileged via file system capabilities.
(CVE-2012-2123, Important)

* It was found that the data_len parameter of the sock_alloc_send_pskb() function in the Linux kernel's networking implementation was not validated before use. A privileged guest user in a KVM guest could use this flaw to crash the host or, possibly, escalate their privileges on the host. (CVE-2012-2136, Important)

* A buffer overflow flaw was found in the setup_routing_entry() function in the KVM subsystem of the Linux kernel in the way the Message Signaled Interrupts (MSI) routing entry was handled. A local, unprivileged user could use this flaw to cause a denial of service or, possibly, escalate their privileges. (CVE-2012-2137, Important)

* A race condition was found in the Linux kernel's memory management subsystem in the way pmd_none_or_clear_bad(), when called with mmap_sem in read mode, and Transparent Huge Pages (THP) page faults interacted. A privileged user in a KVM guest with the ballooning functionality enabled could potentially use this flaw to crash the host. A local, unprivileged user could use this flaw to crash the system. (CVE-2012-1179, Moderate)

* A flaw was found in the way device memory was handled during guest device removal. Upon successful device removal, memory used by the device was not properly unmapped from the corresponding IOMMU or properly released from the kernel, leading to a memory leak. A malicious user on a KVM host who has the ability to assign a device to a guest could use this flaw to crash the host. (CVE-2012-2121, Moderate)

* A flaw was found in the Linux kernel's Reliable Datagram Sockets (RDS) protocol implementation. A local, unprivileged user could use this flaw to cause a denial of service. (CVE-2012-2372, Moderate)

* A race condition was found in the Linux kernel's memory management subsystem in the way pmd_populate() and pte_offset_map_lock() interacted on 32-bit x86 systems with more than 4GB of RAM. A local, unprivileged user could use this flaw to cause a denial of service.
(CVE-2012-2373, Moderate)

Red Hat would like to thank Chen Haogang for reporting CVE-2012-0044.

This update also fixes several bugs. Documentation for these changes will be available shortly from the Technical Notes document linked to in the References section.

Users should upgrade to these updated packages, which contain backported patches to correct these issues, and fix the bugs noted in the Technical Notes. The system must be rebooted for this update to take effect.

The remote Redhat Enterprise Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2012:0743 advisory.

  - kernel: drm: integer overflow in drm_mode_dirtyfb_ioctl() (CVE-2012-0044)

  - kernel: thp:__split_huge_page() mapcount != page_mapcount BUG_ON() (CVE-2012-1179)

  - kernel: macvtap: zerocopy: vector length is not validated before pinning user pages (CVE-2012-2119)

  - kvm: device assignment page leak (CVE-2012-2121)

  - kernel: fcaps: clear the same personality flags as suid when fcaps are used (CVE-2012-2123)

  - kernel: net: insufficient data_len validation in sock_alloc_send_pskb() (CVE-2012-2136)

  - kernel: kvm: buffer overflow in kvm_set_irq() (CVE-2012-2137)

  - kernel: rds-ping cause kernel panic (CVE-2012-2372)

  - kernel: mm: read_pmd_atomic: 32bit PAE pmd walk vs pmd_populate SMP race condition (CVE-2012-2373)

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

The remote CentOS system is missing a security update which has been documented in Red Hat advisory RHSA-2012-0743.

ID	Name	Product	Family	Severity
83611	SUSE SLES11 Security Update : kernel (SUSE-SU-2014:0287-1)	Nessus	SuSE Local Security Checks	high
79484	OracleVM 3.1 : kernel-uek (OVMSA-2012-0042)	Nessus	OracleVM Local Security Checks	high
74513	Mandriva Linux Security Advisory : kernel (MDVSA-2014:124)	Nessus	Mandriva Local Security Checks	critical
68676	Oracle Linux 5 / 6 : Unbreakable Enterprise kernel (ELSA-2012-2021)	Nessus	Oracle Linux Local Security Checks	high
68675	Oracle Linux 5 / 6 : Unbreakable Enterprise kernel (ELSA-2012-2020)	Nessus	Oracle Linux Local Security Checks	high
68544	Oracle Linux 6 : kernel (ELSA-2012-0743)	Nessus	Oracle Linux Local Security Checks	high
66344	SuSE 11.2 Security Update : Linux kernel (SAT Patch Numbers 7667 / 7669 / 7675)	Nessus	SuSE Local Security Checks	high
62546	USN-1609-1 : linux-ti-omap4 vulnerability	Nessus	Ubuntu Local Security Checks	medium
62514	Ubuntu 11.10 : linux vulnerabilities (USN-1607-1)	Nessus	Ubuntu Local Security Checks	medium
62513	Ubuntu 10.04 LTS : linux vulnerabilities (USN-1606-1)	Nessus	Ubuntu Local Security Checks	medium
62430	Ubuntu 10.04 LTS : linux-lts-backport-oneiric vulnerabilities (USN-1594-1)	Nessus	Ubuntu Local Security Checks	medium
61507	Ubuntu 12.04 LTS : linux vulnerabilities (USN-1529-1)	Nessus	Ubuntu Local Security Checks	high
61506	USN-1514-1 : linux-ti-omap4 vulnerabilities	Nessus	Ubuntu Local Security Checks	high
61331	Scientific Linux Security Update : kernel on SL6.x i386/x86_64 (20120618)	Nessus	Scientific Linux Local Security Checks	high
59609	CentOS 6 : kernel (CESA-2012:0743)	Nessus	CentOS Local Security Checks	high
59562	RHEL 6 : kernel (RHSA-2012:0743)	Nessus	Red Hat Local Security Checks	high
801519	CentOS RHSA-2012-0743 Security Check	Log Correlation Engine	Generic	high

Detections

Analytics

CVE-2012-2137

high

Tenable Plugins

high

high

critical

high

high

high

high

medium

medium

medium

medium

high

high

high

high

high

high