- --------------------------------------------------------------------------Debian Security Advisory DSA 1381-1                    security@debian.org
http://www.debian.org/security/                               Dann Frazier
October 2nd, 2007                       http://www.debian.org/security/faq
- --------------------------------------------------------------------------Package        : linux-2.6
Vulnerability  : several
Problem-Type   : local
Debian-specific: no
CVE ID         : CVE-2006-5755 CVE-2007-4133 CVE-2007-4573 CVE-2007-5093

Several local vulnerabilities have been discovered in the Linux kernel
that may lead to a denial of service or the execution of arbitrary
code. The Common Vulnerabilities and Exposures project identifies the
following problems:

CVE-2006-5755

    The NT bit maybe leaked into the next task which can local attackers
    to cause a Denial of Service (crash) on systems which run the 'amd64'
    flavour kernel. The stable distribution ('etch') was not believed to
    be vulnerable to this issue at the time of release, however Bastian
    Blank discovered that this issue still applied to the 'xen-amd64' and
    'xen-vserver-amd64' flavours, and is resolved by this DSA.

CVE-2007-4133

    Hugh Dickins discovered a potential local DoS (panic) in hugetlbfs.
    A misconversion of hugetlb_vmtruncate_list to prio_tree may allow
    local users to trigger a BUG_ON() call in exit_mmap.

CVE-2007-4573

    Wojciech Purczynski discovered a vulnerability that can be exploited
    by a local user to obtain superuser privileges on x86_64 systems.
    This resulted from improper clearing of the high bits of registers
    during ia32 system call emulation. This vulnerability is relevant
    to the Debian amd64 port as well as users of the i386 port who run
    the amd64 linux-image flavour.

    DSA-1378 resolved this problem for the 'amd64' flavour kernels, but
    Tim Wickberg and Ralf Hemmenst