Ubuntu 1812-1: Linux kernel (Quantal HWE) vulnerabilities

    Date01 May 2013
    CategoryUbuntu
    47
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Ubuntu Security Notice USN-1812-1
    May 01, 2013
    
    linux-lts-quantal vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 12.04 LTS
    
    Summary:
    
    Several security issues were fixed in the kernel.
    
    Software Description:
    - linux-lts-quantal: Linux hardware enablement kernel from Quantal
    
    Details:
    
    Mathias Krause discovered an information leak in the Linux kernel's UDF
    file system implementation. A local user could exploit this flaw to examine
    some of the kernel's heap memory. (CVE-2012-6548)
    
    Mathias Krause discovered an information leak in the Linux kernel's ISO
    9660 CDROM file system driver. A local user could exploit this flaw to
    examine some of the kernel's heap memory. (CVE-2012-6549)
    
    An integer overflow was discovered in the Direct Rendering Manager (DRM)
    subsystem for the i915 video driver in the Linux kernel. A local user could
    exploit this flaw to cause a denial of service (crash) or potentially
    escalate privileges. (CVE-2013-0913)
    
    Andrew Honig discovered a flaw in guest OS time updates in the Linux
    kernel's KVM (Kernel-based Virtual Machine). A privileged guest user could
    exploit this flaw to cause a denial of service (crash host system) or
    potentially escalate privilege to the host kernel level. (CVE-2013-1796)
    
    Andrew Honig discovered a use after free error in guest OS time updates in
    the Linux kernel's KVM (Kernel-based Virtual Machine). A privileged guest
    user could exploit this flaw to escalate privilege to the host kernel
    level. (CVE-2013-1797)
    
    Andrew Honig reported a flaw in the way KVM (Kernel-based Virtual Machine)
    emulated the IOAPIC. A privileged guest user could exploit this flaw to
    read host memory or cause a denial of service (crash the host).
    (CVE-2013-1798)
    
    A format-string bug was discovered in the Linux kernel's ext3 filesystem
    driver. A local user could exploit this flaw to possibly escalate
    privileges on the system. (CVE-2013-1848)
    
    A buffer overflow was discovered in the Linux Kernel's USB subsystem for
    devices reporting the cdc-wdm class. A specially crafted USB device when
    plugged-in could cause a denial of service (system crash) or possibly
    execute arbitrary code. (CVE-2013-1860)
    
    An information leak in the Linux kernel's dcb netlink interface was
    discovered. A local user could obtain sensitive information by examining
    kernel stack memory. (CVE-2013-2634)
    
    A kernel stack information leak was discovered in the RTNETLINK component
    of the Linux kernel. A local user could read sensitive information from the
    kernel stack. (CVE-2013-2635)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 12.04 LTS:
      linux-image-3.5.0-28-generic    3.5.0-28.48~precise1
    
    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-1812-1
      CVE-2012-6548, CVE-2012-6549, CVE-2013-0913, CVE-2013-1796,
      CVE-2013-1797, CVE-2013-1798, CVE-2013-1848, CVE-2013-1860,
      CVE-2013-2634, CVE-2013-2635
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux-lts-quantal/3.5.0-28.48~precise1
    
    
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