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redhatRedHatRHSA-2010:0380
HistoryApr 27, 2010 - 12:00 a.m.

(RHSA-2010:0380) Important: kernel security and bug fix update

2010-04-2700:00:00
access.redhat.com
27

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

0.053 Low

EPSS

Percentile

92.3%

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

Security fixes:

  • a race condition was found in the mac80211 implementation, a framework
    used for writing drivers for wireless devices. An attacker could trigger
    this flaw by sending a Delete Block ACK (DELBA) packet to a target system,
    resulting in a remote denial of service. Note: This issue only affected
    users on 802.11n networks, and that also use the iwlagn driver with Intel
    wireless hardware. (CVE-2009-4027, Important)

  • a use-after-free flaw was found in the tcp_rcv_state_process() function
    in the Linux kernel TCP/IP protocol suite implementation. If a system using
    IPv6 had the IPV6_RECVPKTINFO option set on a listening socket, a remote
    attacker could send an IPv6 packet to that system, causing a kernel panic
    (denial of service). (CVE-2010-1188, Important)

  • a flaw was found in the gfs2_lock() implementation. The GFS2 locking code
    could skip the lock operation for files that have the S_ISGID bit
    (set-group-ID on execution) in their mode set. A local, unprivileged user
    on a system that has a GFS2 file system mounted could use this flaw to
    cause a kernel panic (denial of service). (CVE-2010-0727, Moderate)

  • a divide-by-zero flaw was found in the ext4 file system code. A local
    attacker could use this flaw to cause a denial of service by mounting a
    specially-crafted ext4 file system. (CVE-2009-4307, Low)

Bug fixes:

  • if a program that calls posix_fadvise() were compiled on x86, and then
    run on a 64-bit system, that program could experience various problems,
    including performance issues and the call to posix_fadvise() failing,
    causing the program to not run as expected or even abort. With this update,
    when such programs attempt to call posix_fadvise() on 64-bit systems,
    sys32_fadvise64() is called instead, which resolves this issue. This update
    also fixes other 32-bit system calls that were mistakenly called on 64-bit
    systems (including systems running the kernel-xen kernel). (BZ#569597)

  • on some systems able to set a P-State limit via the BIOS, it was not
    possible to set the limit to a higher frequency if the system was rebooted
    while a low limit was set:
    “/sys/devices/system/cpu/cpu[x]/cpufreq/scaling_max_freq” would retain the
    low limit in these situations. With this update, limits are correctly set,
    even after being changed after a system reboot. (BZ#569727)

  • certain Intel ICH hardware (using the e1000e driver) has an NFS filtering
    capability that did not work as expected, causing memory corruption, which
    could lead to kernel panics, or other unexpected behavior. In a reported
    case, a panic occurred when running NFS connection tests. This update
    resolves this issue by disabling the filtering capability. (BZ#569797)

  • if “open(/proc/[PID]/[xxxx])” was called at the same time the process was
    exiting, the call would fail with an EINVAL error (an incorrect error for
    this situation). With this update, the correct error, ENOENT, is returned
    in this situation. (BZ#571362)

  • multiqueue is used for transmitting data, but a single queue transmit
    ON/OFF scheme was used. This led to a race condition on systems with the
    bnx2x driver in situations where one queue became full, but not stopped,
    and the other queue enabled transmission. With this update, only a single
    queue is used. (BZ#576951)

  • the “/proc/sys/vm/mmap_min_addr” tunable helps prevent unprivileged
    users from creating new memory mappings below the minimum address. The
    sysctl value for mmap_min_addr could be changed by a process or user that
    has an effective user ID (euid) of 0, even if the process or user does not
    have the CAP_SYS_RAWIO capability. This update adds a capability check for
    the CAP_SYS_RAWIO capability before allowing the mmap_min_addr value to be
    changed. (BZ#577206)

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

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

0.053 Low

EPSS

Percentile

92.3%