Lucene search

K
redhat
RedHatRHSA-2008:0957
HistoryNov 04, 2008 - 12:00 a.m.

(RHSA-2008:0957) Important: kernel security and bug fix update

2008-11-0400:00:00
access.redhat.com
29

7.1 High

CVSS2

Access Vector

NETWORK

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

AV:N/AC:M/Au:N/C:N/I:N/A:C

0.663 Medium

EPSS

Percentile

97.6%

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

  • the Xen implementation did not prevent applications running in a
    para-virtualized guest from modifying CR4 TSC. This could cause a local
    denial of service. (CVE-2007-5907, Important)

  • Tavis Ormandy reported missing boundary checks in the Virtual Dynamic
    Shared Objects (vDSO) implementation. This could allow a local unprivileged
    user to cause a denial of service or escalate privileges. (CVE-2008-3527,
    Important)

  • the do_truncate() and generic_file_splice_write() functions did not clear
    the setuid and setgid bits. This could allow a local unprivileged user to
    obtain access to privileged information. (CVE-2008-4210, CVE-2008-3833,
    Important)

  • a flaw was found in the Linux kernel splice implementation. This could
    cause a local denial of service when there is a certain failure in the
    add_to_page_cache_lru() function. (CVE-2008-4302, Important)

  • a flaw was found in the Linux kernel when running on AMD64 systems.
    During a context switch, EFLAGS were being neither saved nor restored. This
    could allow a local unprivileged user to cause a denial of service.
    (CVE-2006-5755, Low)

  • a flaw was found in the Linux kernel virtual memory implementation. This
    could allow a local unprivileged user to cause a denial of service.
    (CVE-2008-2372, Low)

  • an integer overflow was discovered in the Linux kernel Datagram
    Congestion Control Protocol (DCCP) implementation. This could allow a
    remote attacker to cause a denial of service. By default, remote DCCP is
    blocked by SELinux. (CVE-2008-3276, Low)

In addition, these updated packages fix the following bugs:

  • random32() seeding has been improved.

  • in a multi-core environment, a race between the QP async event-handler
    and the destro_qp() function could occur. This led to unpredictable results
    during invalid memory access, which could lead to a kernel crash.

  • a format string was omitted in the call to the request_module() function.

  • a stack overflow caused by an infinite recursion bug in the binfmt_misc
    kernel module was corrected.

  • the ata_scsi_rbuf_get() and ata_scsi_rbuf_put() functions now check for
    scatterlist usage before calling kmap_atomic().

  • a sentinel NUL byte was added to the device_write() function to ensure
    that lspace.name is NUL-terminated.

  • in the character device driver, a range_is_allowed() check was added to
    the read_mem() and write_mem() functions. It was possible for an
    illegitimate application to bypass these checks, and access /dev/mem beyond
    the 1M limit by calling mmap_mem() instead. Also, the parameters of
    range_is_allowed() were changed to cleanly handle greater than 32-bits of
    physical address on 32-bit architectures.

  • some of the newer Nehalem-based systems declare their CPU DSDT entries as
    type “Alias”. During boot, this caused an “Error attaching device data”
    message to be logged.

  • the evtchn event channel device lacked locks and memory barriers. This
    has led to xenstore becoming unresponsive on the Itanium® architecture.

  • sending of gratuitous ARP packets in the Xen frontend network driver is
    now delayed until the backend signals that its carrier status has been
    processed by the stack.

  • on forcedeth devices, whenever setting ethtool parameters for link speed,
    the device could stop receiving interrupts.

  • the CIFS ‘forcedirectio’ option did not allow text to be appended to files.

  • the gettimeofday() function returned a backwards time on Intel® 64.

  • residual-count corrections during UNDERRUN handling were added to the
    qla2xxx driver.

  • the fix for a small quirk was removed for certain Adaptec controllers for
    which it caused problems.

  • the “xm trigger init” command caused a domain panic if a userland
    application was running on a guest on the Intel® 64 architecture.

Users of kernel should upgrade to these updated packages, which contain
backported patches to correct these issues.

How to protect your server from attacks?

7.1 High

CVSS2

Access Vector

NETWORK

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

AV:N/AC:M/Au:N/C:N/I:N/A:C

0.663 Medium

EPSS

Percentile

97.6%

Related for RHSA-2008:0957