Ubuntu 1440-1: Linux kernel (Natty backport) vulnerabilities

    Date08 May 2012
    CategoryUbuntu
    64
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Ubuntu Security Notice USN-1440-1
    May 08, 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:
    
    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 Bärwolf 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)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 10.04 LTS:
      linux-image-2.6.38-15-generic   2.6.38-15.59~lucid1
      linux-image-2.6.38-15-generic-pae  2.6.38-15.59~lucid1
      linux-image-2.6.38-15-server    2.6.38-15.59~lucid1
      linux-image-2.6.38-15-virtual   2.6.38-15.59~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-1440-1
      CVE-2011-4086, CVE-2011-4347, CVE-2012-0045, CVE-2012-1090,
      CVE-2012-1097, CVE-2012-1146, CVE-2012-2100
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux-lts-backport-natty/2.6.38-15.59~lucid1
    
    
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