The em_syscall function in arch/x86/kvm/emulate.c in the KVM implementation in the Linux kernel before 3.2.14 does not properly handle the 0f05 (aka syscall) opcode, which allows guest OS users to cause a denial of service (guest OS crash) via a crafted application, as demonstrated by an NASM file.

The remote Redhat Enterprise Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2012:0422 advisory.

    The rhev-hypervisor6 package provides a Red Hat Enterprise Virtualization     Hypervisor ISO disk image. The Red Hat Enterprise Virtualization Hypervisor     is a dedicated Kernel-based Virtual Machine (KVM) hypervisor. It includes     everything necessary to run and manage virtual machines: A subset of the     Red Hat Enterprise Linux operating environment and the Red Hat Enterprise     Virtualization Agent.

    Note: Red Hat Enterprise Virtualization Hypervisor is only available for     the Intel 64 and AMD64 architectures with virtualization extensions.

    A flaw was found in the way the Linux kernel's KVM hypervisor     implementation emulated the syscall instruction for 32-bit guests. An     unprivileged guest user could trigger this flaw to crash the guest.
    (CVE-2012-0045)

    A divide-by-zero flaw was found in the Linux kernel's igmp_heard_query()     function. An attacker able to send certain IGMP (Internet Group Management     Protocol) packets to a target system could use this flaw to cause a denial     of service. (CVE-2012-0207)

    Red Hat would like to thank Stephan Brwolf for reporting CVE-2012-0045,     and Simon McVittie for reporting CVE-2012-0207.

    This updated package provides updated components that include fixes for     various security issues. These issues have no security impact on Red Hat     Enterprise Virtualization Hypervisor itself, however. The security fixes     included in this update address the following CVE numbers:

    CVE-2011-4077, CVE-2011-4081, CVE-2011-4132, CVE-2011-4347, CVE-2011-4594,     CVE-2011-4611, CVE-2011-4622 and CVE-2012-0038 (kernel issues)

    CVE-2012-0444 (libvorbis issue)

    CVE-2012-0841 (libxml2 issue)

    This update also fixes the following bug:

    * The rhev-hypervisor5 and rhev-hypervisor6 packages sometimes updated the     symbolic links in the /usr/share/rhev-hypervisor/ directory with incorrect     targets. The packages have been updated, they now always update the     symbolic links with the correct targets. (BZ#784706)

    Users of Red Hat Enterprise Virtualization Hypervisor are advised to     upgrade to this updated package, which fixes these issues.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

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

A buffer overflow flaw was found in the way the Linux kernel's XFS file system implementation handled links with overly long path names.
A local, unprivileged user could use this flaw to cause a denial of service or escalate their privileges by mounting a specially crafted disk. (CVE-2011-4077 , Moderate)

Flaws in ghash_update() and ghash_final() could allow a local, unprivileged user to cause a denial of service. (CVE-2011-4081 , Moderate)

A flaw was found in the Linux kernel's Journaling Block Device (JBD).
A local, unprivileged user could use this flaw to crash the system by mounting a specially crafted ext3 or ext4 disk. (CVE-2011-4132 , Moderate)

It was found that the kvm_vm_ioctl_assign_device() function in the KVM (Kernel-based Virtual Machine) subsystem of a Linux kernel did not check if the user requesting device assignment was privileged or not.
A local, unprivileged user on the host could assign unused PCI devices, or even devices that were in use and whose resources were not properly claimed by the respective drivers, which could result in the host crashing. (CVE-2011-4347 , Moderate)

Two flaws were found in the way the Linux kernel's __sys_sendmsg() function, when invoked via the sendmmsg() system call, accessed user-space memory. A local, unprivileged user could use these flaws to cause a denial of service. (CVE-2011-4594 , Moderate)

A previous update introduced an integer overflow flaw in the Linux kernel. On PowerPC systems, a local, unprivileged user could use this flaw to cause a denial of service. (CVE-2011-4611 , Moderate)

A flaw was found in the way the KVM subsystem of a Linux kernel handled PIT (Programmable Interval Timer) IRQs (interrupt requests) when there was no virtual interrupt controller set up. A local, unprivileged user on the host could force this situation to occur, resulting in the host crashing. (CVE-2011-4622 , Moderate)

A flaw was found in the way the Linux kernel's XFS file system implementation handled on-disk Access Control Lists (ACLs). A local, unprivileged user could use this flaw to cause a denial of service or escalate their privileges by mounting a specially crafted disk.
(CVE-2012-0038 , Moderate)

A flaw was found in the way the Linux kernel's KVM hypervisor implementation emulated the syscall instruction for 32-bit guests. An unprivileged guest user could trigger this flaw to crash the guest.
(CVE-2012-0045 , Moderate)

A divide-by-zero flaw was found in the Linux kernel's igmp_heard_query() function. An attacker able to send certain IGMP (Internet Group Management Protocol) packets to a target system could use this flaw to cause a denial of service. (CVE-2012-0207 , Moderate)

The remote Oracle Linux 5 / 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2012-2003 advisory.

    - [fs] xfs: Fix possible memory corruption in xfs_readlink (Carlos Maiolino) {CVE-2011-4077}
    - crypto: ghash - Avoid null pointer dereference if no key is set (Nick Bowler) {CVE-2011-4081}
    - jbd/jbd2: validate sb->s_first in journal_get_superblock() (Eryu Guan) {CVE-2011-4132}
    - KVM: Device assignment permission checks (Joe Jin) {CVE-2011-4347}
    - KVM: x86: Prevent starting PIT timers in the absence of irqchip support (Jan Kiszka) {CVE-2011-4622}
    - xfs: validate acl count (Joe Jin) {CVE-2012-0038}
    - KVM: x86: fix missing checks in syscall emulation (Joe Jin) {CVE-2012-0045}
    - KVM: x86: extend 'struct x86_emulate_ops' with 'get_cpuid' (Joe Jin) {CVE-2012-0045}
    - igmp: Avoid zero delay when receiving odd mixture of IGMP queries (Ben Hutchings) {CVE-2012-0207}

Tenable has extracted the preceding description block directly from the Oracle Linux 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 Oracle Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2012-0350 advisory.

    - [fs] xfs: Fix missing xfs_iunlock() on error recovery path in xfs_readlink() (Carlos Maiolino) [749161     694702] {CVE-2011-4077}
    - [fs] xfs: Fix memory corruption in xfs_readlink (Carlos Maiolino) [749161 694702] {CVE-2011-4077}
    - [net] igmp: Avoid zero delay when receiving odd mixture of IGMP queries (Jiri Pirko) [772870 772871]     {CVE-2012-0207}
    - [fs] xfs: validate acl count (Eric Sandeen) [773282 773283] {CVE-2012-0038}
    - [virt] kvm: x86: fix missing checks in syscall emulation (Marcelo Tosatti) [773390 773391]     {CVE-2012-0045}
    - [virt] kvm: x86: extend 'struct x86_emulate_ops' with 'get_cpuid' (Marcelo Tosatti) [773390 773391]     {CVE-2012-0045}
    - [kernel] crypto: ghash - Avoid null pointer dereference if no key is set (Jiri Benc) [749481 749482]     {CVE-2011-4081}
    - [fs] jbd2: validate sb->s_first in journal_get_superblock() (Eryu Guan) [753344 693981] {CVE-2011-4132}
    - [net] fix unsafe pointer access in sendmmsg (Jiri Benc) [761668 760798] {CVE-2011-4594}
    - [perf] powerpc: Handle events that raise an exception without overflowing (Steve Best) [767917 755737]     {CVE-2011-4611}
    - [virt] x86: Prevent starting PIT timers in the absence of irqchip support (Marcelo Tosatti) [769634     769550] {CVE-2011-4622}
    - [virt] KVM: Device assignment permission checks (Alex Williamson) [756092 756093] {CVE-2011-4347}
    - [virt] KVM: Remove ability to assign a device without iommu support (Alex Williamson) [756092 756093]     {CVE-2011-4347}

Tenable has extracted the preceding description block directly from the Oracle Linux 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 SUSE Linux Enterprise 11 SP1 kernel has been updated to the 2.6.32.59 stable release to fix a lot of bugs and security issues.

The following security issues have been fixed :

  - A use after free bug in hugetlb support could be used by     local attackers to crash the system. (CVE-2012-2133)

  - A NULL pointer dereference bug in the regsets proc file     could be used by local attackers to perhaps crash the     system. With mmap_min_addr is set and enabled,     exploitation is unlikely. (CVE-2012-1097)

  - A reference counting issue in CLONE_IO could be used by     local attackers to cause a denial of service (out of     memory). (CVE-2012-0879)

  - A file handle leak in CIFS code could be used by local     attackers to crash the system. (CVE-2012-1090)

  - Large nested epoll chains could be used by local     attackers to cause a denial of service (excessive CPU     consumption). (CVE-2011-1083)

  - When using KVM, programming a PIT timer without a     irqchip configuration, can be used to crash the kvm     guest. This likely can be done only by a privileged     guest user. (CVE-2011-4622)

  - A KVM 32bit guest crash in 'syscall' opcode handling was     fixed that could be caused by local attackers.
    (CVE-2012-0045)

  - Fixed a oops in jbd/jbd2 that could be caused by     specific filesystem access patterns. The following     non-security issues have been fixed:. (CVE-2011-4086)

X86 :

  - x86: fix the initialization of physnode_map.
    (bnc#748112)

  - x86: Allow bootmem reserves at greater than 8G node     offset within a node. (bnc#740895)

  - x86, tsc: Fix SMI induced variation in     quick_pit_calibrate(). (bnc#751322)

  - x86, efi: Work around broken firmware. (bnc#714507)     BONDING :

  - bonding: update speed/duplex for NETDEV_CHANGE.
    (bnc#752634)

  - bonding: comparing a u8 with -1 is always false.
    (bnc#752634)

  - bonding: start slaves with link down for ARP monitor.
    (bnc#752634)

  - bonding: send gratuitous ARP for all addresses     (bnc#752491). XFS :

  - xfs: Fix excessive inode syncing when project quota is     exceeded. (bnc#756448)

  - xfs: Fix oops on IO error during     xlog_recover_process_iunlinks() (bnc#716850). SCSI :

  - scsi/ses: Handle non-unique element descriptors.
    (bnc#749342, bnc#617344)

  - scsi/sd: mark busy sd majors as allocated (bug#744658).

  - scsi: Check for invalid sdev in scsi_prep_state_check()     (bnc#734300). MD/RAID :

  - md: fix possible corruption of array metadata on     shutdown.

  - md: ensure changes to write-mostly are reflected in     metadata. (bnc#755178)

  - md: do not set md arrays to readonly on shutdown     (bnc#740180, bnc#713148, bnc#734900). XEN :

  - smpboot: adjust ordering of operations.

  - x86-64: provide a memset() that can deal with 4Gb or     above at a time. (bnc#738528)

  - blkfront: properly fail packet requests. (bnc#745929)

  - Update Xen patches to 2.6.32.57.

  - xenbus: Reject replies with payload >     XENSTORE_PAYLOAD_MAX.

  - xenbus_dev: add missing error checks to watch handling.

  - Refresh other Xen patches. (bnc#652942, bnc#668194,     bnc#688079)

  - fix Xen-specific kABI issue in Linux 2.6.19. NFS :

  - NFSD: Fill in WCC data for REMOVE, RMDIR, MKNOD, and     MKDIR. (bnc#751880)

  - nfs: Include SYNC flag when comparing mount options with     NOAC flag. (bnc#745422)

  - NFS returns EIO for EDQUOT and others. (bnc#747028)

  - lockd: fix arg parsing for grace_period and timeout.
    (bnc#733761)

  - nfs: allow nfs4leasetime to be set before starting     servers. (bnc#733761)

  - nfs: handle d_revalidate of dot correctly (bnc#731809).
    S/390 :

  - ctcmpc: use correct idal word list for ctcmpc     (bnc#750171,LTC#79264).

  - qeth: synchronize discipline module loading     (bnc#747430,LTC#78788).

  - qdio: avoid race leading to stall when tolerating CQ     (bnc#737326,LTC#76599).

  - kernel: no storage key operations for invalid page table     entries (bnc#737326,LTC#77697). OTHER :

  - tlan: add cast needed for proper 64 bit operation.
    (bnc#756840)

  - dl2k: Tighten ioctl permissions. (bnc#758813)

  - tg3: Fix RSS ring refill race condition. (bnc#757917)

  - usbhid: fix error handling of not enough bandwidth.
    (bnc#704280)

  - pagecache limit: Fix the shmem deadlock. (bnc#755537)

  - tty_audit: fix tty_audit_add_data live lock on audit     disabled. (bnc#721366)

  - ixgbe: driver sets all WOL flags upon initialization so     that machine is powered on as soon at it is switched     off. (bnc#693639)

  - PCI: Set device power state to PCI_D0 for device without     native PM support. (bnc#752972)

  - dlm: Do not allocate a fd for peeloff. (bnc#729247)

  - sctp: Export sctp_do_peeloff. (bnc#729247)

  - epoll: Do not limit non-nested epoll paths. (bnc#676204)

  - mlx4: Limit MSI-X vector allocation. (bnc#624072)

  - mlx4: Changing interrupt scheme. (bnc#624072)

  - mlx4_en: Assigning TX irq per ring. (bnc#624072)

  - mlx4_en: Restoring RX buffer pointer in case of failure.
    (bnc#624072)

  - mlx4_en: using new mlx4 interrupt scheme. (bnc#624072)

  - igb: Fix for Alt MAC Address feature on 82580 and later     devices. (bnc#746980)

  - igb: Power down link when interface is down.
    (bnc#745699)

  - igb: use correct bits to identify if managability is     enabled. (bnc#743209)

  - intel_agp: Do not oops with zero stolen memory.
    (bnc#738679)

  - agp: fix scratch page cleanup. (bnc#738679)

  - hugetlb: add generic definition of NUMA_NO_NODE.
    (bnc#751844)

  - sched: Fix proc_sched_set_task(). (bnc#717994)

  - PM: Print a warning if firmware is requested when tasks     are frozen. (bnc#749886)

  - PM / Sleep: Fix freezer failures due to racy     usermodehelper_is_disabled(). (bnc#749886)

  - PM / Sleep: Fix read_unlock_usermodehelper() call.
    (bnc#749886)

  - firmware loader: allow builtin firmware load even if     usermodehelper is disabled. (bnc#749886)

  - PM / Hibernate: Enable usermodehelpers in     software_resume() error path. (bnc#744163)

  - ipv6: Allow inet6_dump_addr() to handle more than 64     addresses. (bnc#748279)

  - ipv6: fix refcnt problem related to POSTDAD state.
    (bnc#743619)

  - be2net: change to show correct physical link status.
    (bnc#727834)

  - be2net: changes to properly provide phy details.
    (bnc#727834)

  - aio: fix race between io_destroy() and io_submit().
    (bnc#747445 / bnc#611264)

  - intel-iommu: Check for identity mapping candidate using     system dma mask. (bnc#700449)

  - intel-iommu: Dont cache iova above 32bit. (bnc#700449)

  - intel-iommu: Add domain check in     domain_remove_one_dev_info. (bnc#700449)

  - intel-iommu: Provide option to enable 64-bit IOMMU pass     through mode. (bnc#700449)

  - intel-iommu: Remove Host Bridge devices from identity     mapping. (bnc#700449)

  - intel-iommu: Speed up processing of the identity_mapping     function. (bnc#700449)

  - intel-iommu: Use coherent DMA mask when requested.
    (bnc#700449)

  - 1: Fix accounting of softirq time when idle.
    (bnc#719793)

  - driver-core: fix race between device_register and     driver_register. (bnc#742358)

  - dcache: patches.fixes/large-hash-dcache_init-fix.patch:
    Fix oops when initializing large hash on > 16TB machine.
    (bnc#742210)

  - kdump: Save PG_compound or PG_head value in VMCOREINFO.
    (bnc#738503)

  - Update config files: disable NET_9P_RDMA. (bnc#720374)

  - cdc-wdm: fix race leading leading to memory corruption.
    (bnc#759544)

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

This update fixes the following security issues :

  - A buffer overflow flaw was found in the way the Linux     kernel's XFS file system implementation handled links     with overly long path names. A local, unprivileged user     could use this flaw to cause a denial of service or     escalate their privileges by mounting a specially     crafted disk. (CVE-2011-4077, Moderate)

  - Flaws in ghash_update() and ghash_final() could allow a     local, unprivileged user to cause a denial of service.
    (CVE-2011-4081, Moderate)

  - A flaw was found in the Linux kernel's Journaling Block     Device (JBD). A local, unprivileged user could use this     flaw to crash the system by mounting a specially crafted     ext3 or ext4 disk. (CVE-2011-4132, Moderate)

  - It was found that the kvm_vm_ioctl_assign_device()     function in the KVM (Kernel-based Virtual Machine)     subsystem of a Linux kernel did not check if the user     requesting device assignment was privileged or not. A     local, unprivileged user on the host could assign unused     PCI devices, or even devices that were in use and whose     resources were not properly claimed by the respective     drivers, which could result in the host crashing.
    (CVE-2011-4347, Moderate)

  - Two flaws were found in the way the Linux kernel's
    __sys_sendmsg() function, when invoked via the     sendmmsg() system call, accessed user-space memory. A     local, unprivileged user could use these flaws to cause     a denial of service. (CVE-2011-4594, Moderate)

  - A flaw was found in the way the KVM subsystem of a Linux     kernel handled PIT (Programmable Interval Timer) IRQs     (interrupt requests) when there was no virtual interrupt     controller set up. A local, unprivileged user on the     host could force this situation to occur, resulting in     the host crashing. (CVE-2011-4622, Moderate)

  - A flaw was found in the way the Linux kernel's XFS file     system implementation handled on-disk Access Control     Lists (ACLs). A local, unprivileged user could use this     flaw to cause a denial of service or escalate their     privileges by mounting a specially crafted disk.
    (CVE-2012-0038, Moderate)

  - A flaw was found in the way the Linux kernel's KVM     hypervisor implementation emulated the syscall     instruction for 32-bit guests. An unprivileged guest     user could trigger this flaw to crash the guest.
    (CVE-2012-0045, Moderate)

  - A divide-by-zero flaw was found in the Linux kernel's     igmp_heard_query() function. An attacker able to send     certain IGMP (Internet Group Management Protocol)     packets to a target system could use this flaw to cause     a denial of service. (CVE-2012-0207, Moderate)

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.

A flaw was found in the Linux's kernels ext4 file system when mounted with a journal. A local, unprivileged user could exploit this flaw to cause a denial of service. (CVE-2011-4086)

Sasha Levin discovered a flaw in the permission checking for device assignments requested via the kvm ioctl in the Linux kernel. A local user could use this flaw to crash the system causing a denial of service. (CVE-2011-4347)

Stephan Barwolf discovered a flaw in the KVM (kernel-based virtual machine) subsystem of the Linux kernel. A local unprivileged user can crash use this flaw to crash VMs causing a deny of service.
(CVE-2012-0045)

A flaw was discovered in the Linux kernel's cifs file system. An unprivileged local user could exploit this flaw to crash the system leading to a denial of service. (CVE-2012-1090)

H. Peter Anvin reported a flaw in the Linux kernel that could crash the system. A local user could exploit this flaw to crash the system.
(CVE-2012-1097)

A flaw was discovered in the Linux kernel's cgroups subset. A local attacker could use this flaw to crash the system. (CVE-2012-1146)

A flaw was found in the Linux kernel's ext4 file system when mounting a corrupt filesystem. A user-assisted remote attacker could exploit this flaw to cause a denial of service. (CVE-2012-2100)

Tetsuo Handa reported a flaw in the OOM (out of memory) killer of the Linux kernel. A local unprivileged user can exploit this flaw to cause system unstability and denial of services. (CVE-2012-4398).

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 the Linux's kernels ext4 file system when mounted with a journal. A local, unprivileged user could exploit this flaw to cause a denial of service. (CVE-2011-4086)

Sasha Levin discovered a flaw in the permission checking for device assignments requested via the kvm ioctl in the Linux kernel. A local user could use this flaw to crash the system causing a denial of service. (CVE-2011-4347)

Stephan Barwolf discovered a flaw in the KVM (kernel-based virtual machine) subsystem of the Linux kernel. A local unprivileged user can crash use this flaw to crash VMs causing a deny of service.
(CVE-2012-0045)

A flaw was discovered in the Linux kernel's cifs file system. An unprivileged local user could exploit this flaw to crash the system leading to a denial of service. (CVE-2012-1090)

H. Peter Anvin reported a flaw in the Linux kernel that could crash the system. A local user could exploit this flaw to crash the system.
(CVE-2012-1097)

A flaw was discovered in the Linux kernel's cgroups subset. A local attacker could use this flaw to crash the system. (CVE-2012-1146)

A flaw was found in the Linux kernel's handling of paged memory. A local unprivileged user, or a privileged user within a KVM guest, could exploit this flaw to crash the system. (CVE-2012-1179)

Tetsuo Handa reported a flaw in the OOM (out of memory) killer of the Linux kernel. A local unprivileged user can exploit this flaw to cause system unstability and denial of services. (CVE-2012-4398).

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.

Sasha Levin discovered a flaw in the permission checking for device assignments requested via the kvm ioctl in the Linux kernel. A local user could use this flaw to crash the system causing a denial of service. (CVE-2011-4347)

Stephan Barwolf discovered a flaw in the KVM (kernel-based virtual machine) subsystem of the Linux kernel. A local unprivileged user can crash use this flaw to crash VMs causing a deny of service.
(CVE-2012-0045)

A flaw was discovered in the Linux kernel's cifs file system. An unprivileged local user could exploit this flaw to crash the system leading to a denial of service. (CVE-2012-1090)

H. Peter Anvin reported a flaw in the Linux kernel that could crash the system. A local user could exploit this flaw to crash the system.
(CVE-2012-1097)

Tetsuo Handa reported a flaw in the OOM (out of memory) killer of the Linux kernel. A local unprivileged user can exploit this flaw to cause system unstability and denial of services. (CVE-2012-4398).

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.

Sasha Levin discovered a flaw in the permission checking for device assignments requested via the kvm ioctl in the Linux kernel. A local user could use this flaw to crash the system causing a denial of service. (CVE-2011-4347)

Stephan Barwolf discovered a flaw in the KVM (kernel-based virtual machine) subsystem of the Linux kernel. A local unprivileged user can crash use this flaw to crash VMs causing a deny of service.
(CVE-2012-0045)

H. Peter Anvin reported a flaw in the Linux kernel that could crash the system. A local user could exploit this flaw to crash the system.
(CVE-2012-1097)

A flaw was discovered in the Linux kernel's cgroups subset. A local attacker could use this flaw to crash the system. (CVE-2012-1146).

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.

This USN was released in error and has been removed.

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.

Paolo Bonzini discovered a flaw in Linux's handling of the SG_IO ioctl command. A local user, or user in a VM could exploit this flaw to bypass restrictions and gain read/write access to all data on the affected block device. (CVE-2011-4127)

A flaw was found in the Linux kernel's ext4 file system when mounting a corrupt filesystem. A user-assisted remote attacker could exploit this flaw to cause a denial of service. (CVE-2012-2100).

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.

Several vulnerabilities have been discovered in the Linux kernel that may lead to a denial of service or privilege escalation. The Common Vulnerabilities and Exposures project identifies the following problems :

  - CVE-2009-4307     Nageswara R Sastry reported an issue in the ext4     filesystem. Local users with the privileges to mount a     filesystem can cause a denial of service (BUG) by     providing a s_log_groups_per_flex value greater than 31.

  - CVE-2011-1833     Vasiliy Kulikov of Openwall and Dan Rosenberg discovered     an information leak in the eCryptfs filesystem. Local     users were able to mount arbitrary directories.

  - CVE-2011-4347     Sasha Levin reported an issue in the device assignment     functionality in KVM. Local users with permission to     access /dev/kvm could assign unused pci devices to a     guest and cause a denial of service (crash).

  - CVE-2012-0045     Stephan Barwolf reported an issue in KVM. Local users in     a 32-bit guest running on a 64-bit system can crash the     guest with a syscall instruction.

  - CVE-2012-1090     CAI Qian reported an issue in the CIFS filesystem. A     reference count leak can occur during the lookup of     special files, resulting in a denial of service (oops)     on umount.

  - CVE-2012-1097     H. Peter Anvin reported an issue in the regset     infrastructure. Local users can cause a denial of     service (NULL pointer dereference) by triggering the     write methods of readonly regsets.

Updated kernel packages that fix various 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 moderate 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 buffer overflow flaw was found in the way the Linux kernel's XFS file system implementation handled links with overly long path names.
A local, unprivileged user could use this flaw to cause a denial of service or escalate their privileges by mounting a specially crafted disk. (CVE-2011-4077, Moderate)

* Flaws in ghash_update() and ghash_final() could allow a local, unprivileged user to cause a denial of service. (CVE-2011-4081, Moderate)

* A flaw was found in the Linux kernel's Journaling Block Device (JBD). A local, unprivileged user could use this flaw to crash the system by mounting a specially crafted ext3 or ext4 disk.
(CVE-2011-4132, Moderate)

* It was found that the kvm_vm_ioctl_assign_device() function in the KVM (Kernel-based Virtual Machine) subsystem of a Linux kernel did not check if the user requesting device assignment was privileged or not.
A local, unprivileged user on the host could assign unused PCI devices, or even devices that were in use and whose resources were not properly claimed by the respective drivers, which could result in the host crashing. (CVE-2011-4347, Moderate)

* Two flaws were found in the way the Linux kernel's __sys_sendmsg() function, when invoked via the sendmmsg() system call, accessed user-space memory. A local, unprivileged user could use these flaws to cause a denial of service. (CVE-2011-4594, Moderate)

* The RHSA-2011:1530 kernel update introduced an integer overflow flaw in the Linux kernel. On PowerPC systems, a local, unprivileged user could use this flaw to cause a denial of service. (CVE-2011-4611, Moderate)

* A flaw was found in the way the KVM subsystem of a Linux kernel handled PIT (Programmable Interval Timer) IRQs (interrupt requests) when there was no virtual interrupt controller set up. A local, unprivileged user on the host could force this situation to occur, resulting in the host crashing. (CVE-2011-4622, Moderate)

* A flaw was found in the way the Linux kernel's XFS file system implementation handled on-disk Access Control Lists (ACLs). A local, unprivileged user could use this flaw to cause a denial of service or escalate their privileges by mounting a specially crafted disk.
(CVE-2012-0038, Moderate)

* A flaw was found in the way the Linux kernel's KVM hypervisor implementation emulated the syscall instruction for 32-bit guests. An unprivileged guest user could trigger this flaw to crash the guest.
(CVE-2012-0045, Moderate)

* A divide-by-zero flaw was found in the Linux kernel's igmp_heard_query() function. An attacker able to send certain IGMP (Internet Group Management Protocol) packets to a target system could use this flaw to cause a denial of service. (CVE-2012-0207, Moderate)

Red Hat would like to thank Nick Bowler for reporting CVE-2011-4081;
Sasha Levin for reporting CVE-2011-4347; Tetsuo Handa for reporting CVE-2011-4594; Maynard Johnson for reporting CVE-2011-4611; Wang Xi for reporting CVE-2012-0038; Stephan Barwolf for reporting CVE-2012-0045; and Simon McVittie for reporting CVE-2012-0207.
Upstream acknowledges Mathieu Desnoyers as the original reporter of CVE-2011-4594.

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-2012:0350 advisory.

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

    This update fixes the following security issues:

    * A buffer overflow flaw was found in the way the Linux kernel's XFS file     system implementation handled links with overly long path names. A local,     unprivileged user could use this flaw to cause a denial of service or     escalate their privileges by mounting a specially-crafted disk.
    (CVE-2011-4077, Moderate)

    * Flaws in ghash_update() and ghash_final() could allow a local,     unprivileged user to cause a denial of service. (CVE-2011-4081, Moderate)

    * A flaw was found in the Linux kernel's Journaling Block Device (JBD). A     local, unprivileged user could use this flaw to crash the system by     mounting a specially-crafted ext3 or ext4 disk. (CVE-2011-4132, Moderate)

    * It was found that the kvm_vm_ioctl_assign_device() function in the KVM     (Kernel-based Virtual Machine) subsystem of a Linux kernel did not check if     the user requesting device assignment was privileged or not. A local,     unprivileged user on the host could assign unused PCI devices, or even     devices that were in use and whose resources were not properly claimed by     the respective drivers, which could result in the host crashing.
    (CVE-2011-4347, Moderate)

    * Two flaws were found in the way the Linux kernel's __sys_sendmsg()     function, when invoked via the sendmmsg() system call, accessed user-space     memory. A local, unprivileged user could use these flaws to cause a denial     of service. (CVE-2011-4594, Moderate)

    * The RHSA-2011:1530 kernel update introduced an integer overflow flaw in     the Linux kernel. On PowerPC systems, a local, unprivileged user could use     this flaw to cause a denial of service. (CVE-2011-4611, Moderate)

    * A flaw was found in the way the KVM subsystem of a Linux kernel handled     PIT (Programmable Interval Timer) IRQs (interrupt requests) when there was     no virtual interrupt controller set up. A local, unprivileged user on the     host could force this situation to occur, resulting in the host crashing.
    (CVE-2011-4622, Moderate)

    * A flaw was found in the way the Linux kernel's XFS file system     implementation handled on-disk Access Control Lists (ACLs). A local,     unprivileged user could use this flaw to cause a denial of service or     escalate their privileges by mounting a specially-crafted disk.
    (CVE-2012-0038, Moderate)

    * A flaw was found in the way the Linux kernel's KVM hypervisor     implementation emulated the syscall instruction for 32-bit guests. An     unprivileged guest user could trigger this flaw to crash the guest.
    (CVE-2012-0045, Moderate)

    * A divide-by-zero flaw was found in the Linux kernel's igmp_heard_query()     function. An attacker able to send certain IGMP (Internet Group Management     Protocol) packets to a target system could use this flaw to cause a denial     of service. (CVE-2012-0207, Moderate)

    Red Hat would like to thank Nick Bowler for reporting CVE-2011-4081; Sasha     Levin for reporting CVE-2011-4347; Tetsuo Handa for reporting     CVE-2011-4594; Maynard Johnson for reporting CVE-2011-4611; Wang Xi for     reporting CVE-2012-0038; Stephan Brwolf for reporting CVE-2012-0045; and     Simon McVittie for reporting CVE-2012-0207. Upstream acknowledges Mathieu     Desnoyers as the original reporter of CVE-2011-4594.

    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.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

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

- Update to Linux 3.1.9

    - Fix CVE-2012-0045

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.

The remote CentOS system is missing a security update which has been documented in Red Hat advisory RHSA-2012-0350.

ID	Name	Product	Family	Severity
79285	RHEL 6 : rhev-hypervisor6 (RHSA-2012:0422)	Nessus	Red Hat Local Security Checks	high
69662	Amazon Linux AMI : kernel (ALAS-2012-55)	Nessus	Amazon Linux Local Security Checks	high
68669	Oracle Linux 5 / 6 : Unbreakable Enterprise kernel (ELSA-2012-2003)	Nessus	Oracle Linux Local Security Checks	high
68491	Oracle Linux 6 : kernel (ELSA-2012-0350)	Nessus	Oracle Linux Local Security Checks	high
64173	SuSE 11.1 Security Update : Linux kernel (SAT Patch Numbers 6227 / 6229 / 6230)	Nessus	SuSE Local Security Checks	high
61277	Scientific Linux Security Update : kernel on SL6.x i386/x86_64 (20120306)	Nessus	Scientific Linux Local Security Checks	high
59034	Ubuntu 10.04 LTS : linux-lts-backport-natty vulnerabilities (USN-1440-1)	Nessus	Ubuntu Local Security Checks	critical
58947	Ubuntu 10.04 LTS : linux-lts-backport-oneiric vulnerabilities (USN-1433-1)	Nessus	Ubuntu Local Security Checks	critical
58946	Ubuntu 11.10 : linux vulnerabilities (USN-1431-1)	Nessus	Ubuntu Local Security Checks	critical
58871	Ubuntu 10.04 LTS : linux-ec2 vulnerabilities (USN-1426-1)	Nessus	Ubuntu Local Security Checks	high
58870	Ubuntu 10.04 LTS : linux vulnerabilities (USN-1425-1)	Nessus	Ubuntu Local Security Checks	high
58742	Ubuntu 11.04 : linux vulnerabilities (USN-1422-1)	Nessus	Ubuntu Local Security Checks	critical
58741	Ubuntu 10.04 LTS : linux-lts-backport-maverick vulnerabilities (USN-1421-1)	Nessus	Ubuntu Local Security Checks	critical
58495	Ubuntu 10.10 : linux vulnerabilities (USN-1407-1)	Nessus	Ubuntu Local Security Checks	critical
58494	Ubuntu 11.04 : linux vulnerabilities (USN-1406-1)	Nessus	Ubuntu Local Security Checks	critical
58493	Ubuntu 11.10 : linux vulnerabilities (USN-1405-1)	Nessus	Ubuntu Local Security Checks	critical
58486	Debian DSA-2443-1 : linux-2.6 - privilege escalation/denial of service	Nessus	Debian Local Security Checks	high
58275	CentOS 6 : kernel (CESA-2012:0350)	Nessus	CentOS Local Security Checks	high
58261	RHEL 6 : kernel (RHSA-2012:0350)	Nessus	Red Hat Local Security Checks	high
57548	Fedora 16 : kernel-3.1.9-1.fc16 (2012-0480)	Nessus	Fedora Local Security Checks	medium
801513	CentOS RHSA-2012-0350 Security Check	Log Correlation Engine	Generic	high

Detections

Analytics

CVE-2012-0045

high

Tenable Plugins

high

high

high

high

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high

critical

critical

critical

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critical

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critical

high

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medium

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