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centosCentOS ProjectCESA-2009:1193
HistoryAug 05, 2009 - 4:23 p.m.

kernel security update

CentOS Project

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CentOS Errata and Security Advisory CESA-2009:1193

The kernel packages contain the Linux kernel, the core of any Linux
operating system.

Security fixes:

  • the possibility of a timeout value overflow was found in the Linux kernel
    high-resolution timers functionality, hrtimers. This could allow a local,
    unprivileged user to execute arbitrary code, or cause a denial of service
    (kernel panic). (CVE-2007-5966, Important)

  • a flaw was found in the Intel PRO/1000 network driver in the Linux
    kernel. Frames with sizes near the MTU of an interface may be split across
    multiple hardware receive descriptors. Receipt of such a frame could leak
    through a validation check, leading to a corruption of the length check. A
    remote attacker could use this flaw to send a specially-crafted packet that
    would cause a denial of service or code execution. (CVE-2009-1385,

  • Michael Tokarev reported a flaw in the Realtek r8169 Ethernet driver in
    the Linux kernel. This driver allowed interfaces using this driver to
    receive frames larger than could be handled, which could lead to a remote
    denial of service or code execution. (CVE-2009-1389, Important)

  • the ADDR_COMPAT_LAYOUT and MMAP_PAGE_ZERO flags were not cleared when a
    setuid or setgid program was executed. A local, unprivileged user could use
    this flaw to bypass the mmap_min_addr protection mechanism and perform a
    NULL pointer dereference attack, or bypass the Address Space Layout
    Randomization (ASLR) security feature. (CVE-2009-1895, Important)

  • Ramon de Carvalho Valle reported two flaws in the Linux kernel eCryptfs
    implementation. A local attacker with permissions to perform an eCryptfs
    mount could modify the metadata of the files in that eCrypfts mount to
    cause a buffer overflow, leading to a denial of service or privilege
    escalation. (CVE-2009-2406, CVE-2009-2407, Important)

  • Konstantin Khlebnikov discovered a race condition in the ptrace
    implementation in the Linux kernel. This race condition can occur when the
    process tracing and the process being traced participate in a core dump. A
    local, unprivileged user could use this flaw to trigger a deadlock,
    resulting in a partial denial of service. (CVE-2009-1388, Moderate)

Bug fixes (see References below for a link to more detailed notes):

  • possible dom0 crash when a Xen para-virtualized guest was installed while
    another para-virtualized guest was rebooting. (BZ#497812)

  • no directory removal audit record if the directory and its subtree were
    recursively watched by an audit rule. (BZ#507561)

  • running “echo 1 > /proc/sys/vm/drop_caches” under high memory load could
    cause a kernel panic. (BZ#503692)

  • on 32-bit systems, core dumps for some multithreaded applications did not
    include all thread information. (BZ#505322)

  • a stack buffer used by get_event_name() was too small for nul terminator
    sprintf() writes. This could lead to an invalid pointer or kernel panic.

  • when using the aic94xx driver, systems with SATA drives may not boot due
    to a libsas bug. (BZ#506029)

  • Wacom Cintiq 21UX and Intuos stylus buttons were handled incorrectly when
    moved away from and back to these tablets. (BZ#508275)

  • CPU “soft lockup” messages and possibe system hangs on systems with
    certain Broadcom network devices and running the Linux kernel from the
    kernel-xen package. (BZ#503689)

  • on 64-bit PowerPC, getitimer() failed for programs using the ITIMER_REAL
    timer that were also compiled for 64-bit systems. This caused such programs
    to abort. (BZ#510018)

  • write operations could be blocked even when using O_NONBLOCK. (BZ#510239)

  • the “pci=nomsi” option was required for installing and booting Red Hat
    Enterprise Linux 5.2 on systems with VIA VT3364 chipsets. (BZ#507529)

  • shutting down, destroying, or migrating Xen guests with large amounts of
    memory could cause other guests to be temporarily unresponsive. (BZ#512311)

Users should upgrade to these updated packages, which contain backported
patches to correct these issues. Systems must be rebooted for this update
to take effect.

Merged security bulletin from advisories:

Affected packages:

Upstream details at: