Ubuntu 2464-1: Linux kernel (OMAP4) vulnerabilities

    Date13 Jan 2015
    CategoryUbuntu
    50
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Ubuntu Security Notice USN-2464-1
    January 13, 2015
    
    linux-ti-omap4 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-ti-omap4: Linux kernel for OMAP4
    
    Details:
    
    Andy Lutomirski discovered that the Linux kernel does not properly handle
    faults associated with the Stack Segment (SS) register in the x86
    architecture. A local attacker could exploit this flaw to gain
    administrative privileges. (CVE-2014-9322)
    
    An information leak in the Linux kernel was discovered that could leak the
    high 16 bits of the kernel stack address on 32-bit Kernel Virtual Machine
    (KVM) paravirt guests. A user in the guest OS could exploit this leak to
    obtain information that could potentially be used to aid in attacking the
    kernel. (CVE-2014-8134)
    
    A race condition with MMIO and PIO transactions in the KVM (Kernel Virtual
    Machine) subsystem of the Linux kernel was discovered. A guest OS user
    could exploit this flaw to cause a denial of service (guest OS crash) via a
    specially crafted application. (CVE-2014-7842)
    
    The KVM (kernel virtual machine) subsystem of the Linux kernel
    miscalculates the number of memory pages during the handling of a mapping
    failure. A guest OS user could exploit this to cause a denial of service
    (host OS page unpinning) or possibly have unspecified other impact by
    leveraging guest OS privileges. (CVE-2014-8369)
    
    Andy Lutomirski discovered that the Linux kernel does not properly handle
    faults associated with the Stack Segment (SS) register on the x86
    architecture. A local attacker could exploit this flaw to cause a denial of
    service (panic). (CVE-2014-9090)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 12.04 LTS:
      linux-image-3.2.0-1458-omap4    3.2.0-1458.78
    
    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-2464-1
      CVE-2014-7842, CVE-2014-8134, CVE-2014-8369, CVE-2014-9090,
      CVE-2014-9322
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux-ti-omap4/3.2.0-1458.78
    
    
    
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