[SECURITY] [DSA 3128-1] linux security update

Debian Security Advisory DSA-3128-1                   security@debian.org
http://www.debian.org/security/                      Salvatore Bonaccorso
January 15, 2015                       http://www.debian.org/security/faq
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Package        : linux
CVE ID         : CVE-2013-6885 CVE-2014-8133 CVE-2014-9419 CVE-2014-9529
                 CVE-2014-9584

Several vulnerabilities have been discovered in the Linux kernel that
may lead to a denial of service or information leaks.

CVE-2013-6885

    It was discovered that under specific circumstances, a combination
    of write operations to write-combined memory and locked CPU
    instructions may cause a core hang on AMD 16h 00h through 0Fh
    processors. A local user can use this flaw to mount a denial of
    service (system hang) via a crafted application.

    For more information please refer to the AMD CPU erratum 793 in
    http://support.amd.com/TechDocs/51810_16h_00h-0Fh_Rev_Guide.pdf

CVE-2014-8133

    It was found that the espfix funcionality can be bypassed by
    installing a 16-bit RW data segment into GDT instead of LDT (which
    espfix checks for) and using it for stack. A local unprivileged user
    could potentially use this flaw to leak kernel stack addresses and
    thus allowing to bypass the ASLR protection mechanism.

CVE-2014-9419

    It was found that on Linux kernels compiled with the 32 bit
    interfaces (CONFIG_X86_32) a malicious user program can do a
    partial ASLR bypass through TLS base addresses leak when attacking
    other programs.

CVE-2014-9529

    It was discovered that the Linux kernel is affected by a race
    condition flaw when doing key garbage collection, allowing local
    users to cause a denial of service (memory corruption or panic).

CVE-2014-9584

    It was found that the Linux kernel does not validate a length value
    in the Extensions Reference (ER) System Use Field, which allows
    local users to obtain sensitive information from kernel memory via a
    crafted iso9660 image.

For the stable distribution (wheezy), these problems have been fixed in
version 3.2.65-1+deb7u1. Additionally this update fixes a suspend/resume
regression introduced with 3.2.65.

For the upcoming stable distribution (jessie) and the unstable
distribution (sid), these problems will be fixed soon.

We recommend that you upgrade your linux packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

Mailing list: debian-security-announce@lists.debian.org