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HistoryMar 16, 2010 - 12:00 a.m.

(RHSA-2010:0149) Important: kernel security and bug fix update






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

This update fixes the following security issues:

  • a deficiency was found in the fasync_helper() implementation. This could
    allow a local, unprivileged user to leverage a use-after-free of locked,
    asynchronous file descriptors to cause a denial of service or privilege
    escalation. (CVE-2009-4141, Important)

  • a NULL pointer dereference flaw was found in the sctp_rcv_ootb() function
    in the Linux kernel Stream Control Transmission Protocol (SCTP)
    implementation. A remote attacker could send a specially-crafted SCTP
    packet to a target system, resulting in a denial of service.
    (CVE-2010-0008, Important)

  • a NULL pointer dereference flaw was found in the ip6_dst_lookup_tail()
    function in the Linux kernel. An attacker on the local network could
    trigger this flaw by sending IPv6 traffic to a target system, leading to a
    system crash (kernel OOPS) if dst->neighbour is NULL on the target system
    when receiving an IPv6 packet. (CVE-2010-0437, Important)

This update also fixes the following bugs:

  • programs compiled on x86, and that also call sched_rr_get_interval(),
    were silently corrupted when run on 64-bit systems. With this update, when
    such programs attempt to call sched_rr_get_interval() on 64-bit systems,
    sys32_sched_rr_get_interval() is called instead, which resolves this issue.

  • the fix for CVE-2009-4538 provided by RHSA-2010:0053 introduced a
    regression, preventing Wake on LAN (WoL) working for network devices using
    the Intel PRO/1000 Linux driver, e1000e. Attempting to configure WoL for
    such devices resulted in the following error, even when configuring valid

“Cannot set new wake-on-lan settings: Operation not supported
not setting wol”

This update resolves this regression, and WoL now works as expected for
network devices using the e1000e driver. (BZ#559334)

  • a number of bugs have been fixed in the copy_user routines for Intel 64
    and AMD64 systems, one of which could have possibly led to data corruption.

  • on some systems, a race condition in the inode-based file event
    notifications implementation caused soft lockups and the following

“BUG: warning at fs/inotify.c:181/set_dentry_child_flags()”
“BUG: soft lockup - CPU#[x] stuck for 10s!”

This update resolves this race condition, and also removes the inotify
debugging code from the kernel, due to race conditions in that code.

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.