Ubuntu 1386-1: Linux kernel (Natty backport) vulnerabilities

    Date06 Mar 2012
    CategoryUbuntu
    34
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Ubuntu Security Notice USN-1386-1
    March 06, 2012
    
    linux-lts-backport-natty vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 10.04 LTS
    
    Summary:
    
    Several security issues were fixed in the kernel.
    
    Software Description:
    - linux-lts-backport-natty: Linux kernel backport from Natty
    
    Details:
    
    The linux kernel did not properly account for PTE pages when deciding which
    task to kill in out of memory conditions. A local, unprivileged could
    exploit this flaw to cause a denial of service. (CVE-2011-2498)
    
    A flaw was discovered in the TOMOYO LSM's handling of mount system calls.
    An unprivileged user could oops the system causing a denial of service.
    (CVE-2011-2518)
    
    Han-Wen Nienhuys reported a flaw in the FUSE kernel module. A local user
    who can mount a FUSE file system could cause a denial of service.
    (CVE-2011-3353)
    
    A bug was discovered in the Linux kernel's calculation of OOM (Out of
    memory) scores, that would result in the wrong process being killed. A user
    could use this to kill the process with the highest OOM score, even if that
    process belongs to another user or the system. (CVE-2011-4097)
    
    A flaw was found in KVM's Programmable Interval Timer (PIT). When a virtual
    interrupt control is not available a local user could use this to cause a
    denial of service by starting a timer. (CVE-2011-4622)
    
    A flaw was discovered in the XFS filesystem. If a local user mounts a
    specially crafted XFS image it could potential execute arbitrary code on
    the system. (CVE-2012-0038)
    
    Chen Haogang discovered an integer overflow that could result in memory
    corruption. A local unprivileged user could use this to crash the system.
    (CVE-2012-0044)
    
    A flaw was found in the linux kernels IPv4 IGMP query processing. A remote
    attacker could exploit this to cause a denial of service. (CVE-2012-0207)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 10.04 LTS:
      linux-image-2.6.38-13-generic   2.6.38-13.56~lucid1
      linux-image-2.6.38-13-generic-pae  2.6.38-13.56~lucid1
      linux-image-2.6.38-13-server    2.6.38-13.56~lucid1
      linux-image-2.6.38-13-virtual   2.6.38-13.56~lucid1
    
    After a standard system update you need to reboot your computer to make
    all the necessary changes.
    
    ATTENTION: Due to an unavoidable ABI change the kernel updates have
    been given a new version number, which requires you to recompile and
    reinstall all third party kernel modules you might have installed. If
    you use linux-restricted-modules, you have to update that package as
    well to get modules which work with the new kernel version. Unless you
    manually uninstalled the standard kernel metapackages (e.g. linux-generic,
    linux-server, linux-powerpc), a standard system upgrade will automatically
    perform this as well.
    
    References:
      http://www.ubuntu.com/usn/usn-1386-1
      CVE-2011-2498, CVE-2011-2518, CVE-2011-3353, CVE-2011-4097,
      CVE-2011-4622, CVE-2012-0038, CVE-2012-0044, CVE-2012-0207
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux-lts-backport-natty/2.6.38-13.56~lucid1
    
    
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