Ubuntu 1696-2: Linux kernel regression

    Date01 Feb 2013
    Posted ByLinuxSecurity Advisories
    USN-1696-1 introduced a regression in the Linux kernel.
    Ubuntu Security Notice USN-1696-2
    February 01, 2013
    linux regression
    A security issue affects these releases of Ubuntu and its derivatives:
    - Ubuntu 12.04 LTS
    USN-1696-1 introduced a regression in the Linux kernel.
    Software Description:
    - linux: Linux kernel
    USN-1696-1 fixed vulnerabilities in the Linux kernel. Due to an unrelated
    regression inotify/fanotify stopped working after upgrading. This update
    fixes the problem.
    We apologize for the inconvenience.
    Original advisory details:
     Jon Howell reported a flaw in the Linux kernel's KVM (Kernel-based virtual
     machine) subsystem's handling of the XSAVE feature. On hosts, using qemu
     userspace, without the XSAVE feature an unprivileged local attacker could
     exploit this flaw to crash the system. (CVE-2012-4461)
     A flaw was discovered in the Linux kernel's handling of script execution
     when module loading is enabled. A local attacker could exploit this flaw to
     cause a leak of kernel stack contents. (CVE-2012-4530)
     Florian Weimer discovered that hypervkvpd, which is distributed in the
     Linux kernel, was not correctly validating source addresses of netlink
     packets. An untrusted local user can cause a denial of service by causing
     hypervkvpd to exit. (CVE-2012-5532)
    Update instructions:
    The problem can be corrected by updating your system to the following
    package versions:
    Ubuntu 12.04 LTS:
      linux-image-3.2.0-37-generic    3.2.0-37.58
      linux-image-3.2.0-37-generic-pae  3.2.0-37.58
      linux-image-3.2.0-37-highbank   3.2.0-37.58
      linux-image-3.2.0-37-omap       3.2.0-37.58
      linux-image-3.2.0-37-powerpc-smp  3.2.0-37.58
      linux-image-3.2.0-37-powerpc64-smp  3.2.0-37.58
      linux-image-3.2.0-37-virtual    3.2.0-37.58
    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.
    Package Information:
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