Ubuntu 1452-1: Linux kernel vulnerabilities

    Date25 May 2012
    CategoryUbuntu
    48
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Ubuntu Security Notice USN-1452-1
    May 25, 2012
    
    linux vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 11.10
    
    Summary:
    
    Several security issues were fixed in the kernel.
    
    Software Description:
    - linux: Linux kernel
    
    Details:
    
    A flaw was found in the Linux kernel's KVM (Kernel Virtual Machine) virtual
    cpu setup. An unprivileged local user could exploit this flaw to crash the
    system leading to a denial of service. (CVE-2012-1601)
    
    Steve Grubb reported a flaw with Linux fscaps (file system base
    capabilities) when used to increase the permissions of a process. For
    application on which fscaps are in use a local attacker can disable address
    space randomization to make attacking the process with raised privileges
    easier. (CVE-2012-2123)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 11.10:
      linux-image-3.0.0-20-generic    3.0.0-20.34
      linux-image-3.0.0-20-generic-pae  3.0.0-20.34
      linux-image-3.0.0-20-omap       3.0.0-20.34
      linux-image-3.0.0-20-powerpc    3.0.0-20.34
      linux-image-3.0.0-20-powerpc-smp  3.0.0-20.34
      linux-image-3.0.0-20-powerpc64-smp  3.0.0-20.34
      linux-image-3.0.0-20-server     3.0.0-20.34
      linux-image-3.0.0-20-virtual    3.0.0-20.34
    
    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-1452-1
      CVE-2012-1601, CVE-2012-2123
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/3.0.0-20.34
    
    
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