Ubuntu 2759-1: Linux kernel vulnerabilities

    Date01 Oct 2015
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    Ubuntu Security Notice USN-2759-1
    October 01, 2015
    linux vulnerabilities
    A security issue affects these releases of Ubuntu and its derivatives:
    - Ubuntu 12.04 LTS
    Several security issues were fixed in the kernel.
    Software Description:
    - linux: Linux kernel
    It was discovered that an integer overflow error existed in the SCSI
    generic (sg) driver in the Linux kernel. A local attacker with write
    permission to a SCSI generic device could use this to cause a denial of
    service (system crash) or potentially escalate their privileges.
    Marc-André Lureau discovered that the vhost driver did not properly
    release the userspace provided log file descriptor. A privileged attacker
    could use this to cause a denial of service (resource exhaustion).
    It was discovered that the Linux kernel's perf subsystem did not bound
    callchain backtraces on PowerPC 64. A local attacker could use this to
    cause a denial of service. (CVE-2015-6526)
    Update instructions:
    The problem can be corrected by updating your system to the following
    package versions:
    Ubuntu 12.04 LTS:
      linux-image-3.2.0-91-generic    3.2.0-91.129
      linux-image-3.2.0-91-generic-pae  3.2.0-91.129
      linux-image-3.2.0-91-highbank   3.2.0-91.129
      linux-image-3.2.0-91-omap       3.2.0-91.129
      linux-image-3.2.0-91-powerpc-smp  3.2.0-91.129
      linux-image-3.2.0-91-powerpc64-smp  3.2.0-91.129
      linux-image-3.2.0-91-virtual    3.2.0-91.129
    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.
      CVE-2015-5707, CVE-2015-6252, CVE-2015-6526
    Package Information:
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