Ubuntu 1380-1: Linux kernel vulnerabilities

    Date28 Feb 2012
    CategoryUbuntu
    65
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Ubuntu Security Notice USN-1380-1
    February 29, 2012
    
    linux vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 11.04
    
    Summary:
    
    Several security issues were fixed in the kernel.
    
    Software Description:
    - linux: Linux kernel
    
    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)
    
    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 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 11.04:
      linux-image-2.6.38-13-generic   2.6.38-13.56
      linux-image-2.6.38-13-generic-pae  2.6.38-13.56
      linux-image-2.6.38-13-omap      2.6.38-13.56
      linux-image-2.6.38-13-powerpc   2.6.38-13.56
      linux-image-2.6.38-13-powerpc-smp  2.6.38-13.56
      linux-image-2.6.38-13-powerpc64-smp  2.6.38-13.56
      linux-image-2.6.38-13-server    2.6.38-13.56
      linux-image-2.6.38-13-versatile  2.6.38-13.56
      linux-image-2.6.38-13-virtual   2.6.38-13.56
    
    After a standard system update you need to reboot your computer to make
    all the necessary changes.
    
    References:
      http://www.ubuntu.com/usn/usn-1380-1
      CVE-2011-2498, CVE-2011-2518, CVE-2011-4097, CVE-2012-0207
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/2.6.38-13.56
    
    
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