Synopsis:          Moderate: kernel security and bug fix update
Advisory ID:       SLSA-2014:0926-1
Issue Date:        2014-07-23
CVE Numbers:       CVE-2014-2678
                   CVE-2014-4021
--

* A NULL pointer dereference flaw was found in the rds_iw_laddr_check()
function in the Linux kernel's implementation of Reliable Datagram Sockets
(RDS). A local, unprivileged user could use this flaw to crash the system.
(CVE-2014-2678, Moderate)

* It was found that the Xen hypervisor implementation did not properly
clean memory pages previously allocated by the hypervisor. A privileged
guest user could potentially use this flaw to read data relating to other
guests or the hypervisor itself. (CVE-2014-4021, Moderate)

This update also fixes the following bugs:

* A bug in the journaling block device (jbd and jbd2) code could, under
certain circumstances, trigger a BUG_ON() assertion and result in a kernel
oops. This happened when an application performed an extensive number of
commits to the journal of the ext3 file system and there was no currently
active transaction while synchronizing the file's in-core state. This
problem has been resolved by correcting respective test conditions in the
jbd and jbd2 code.

* After a statically defined gateway became unreachable and its
corresponding neighbor entry entered a FAILED state, the gateway stayed in
the FAILED state even after it became reachable again. As a consequence,
traffic was not routed through that gateway. This update allows probing
such a gateway automatically so that the traffic can be routed through
this gateway again once it becomes reachable.

* Due to an incorrect condition check in the IPv6 code, the ipv6 driver
was unable to correctly assemble incoming packet fragments, which resulted
in a high IPv6 packet loss rate. This update fixes the said check for a
fragment overlap and ensures that incoming IPv6 packet fragments are now
processed as expected.

* Recent changes in the d_splice_alias() function introduced a bug that
allowed d_splice_alias() to return a dentry from a different directory
than the directory being looked up. As a consequence in cluster
environment, a kernel panic could be triggered when a directory was being
removed while a concurrent cross-directory operation was performed on this
directory on another cluster node. This update avoids the kernel panic in
this situation by correcting the search logic in the d_splice_alias()
function so that the function can no longer return a dentry from an
incorrect directory.

* The NFSv4 server did not handle multiple OPEN operations to the same
file separately, which could cause the NFSv4 client to repeatedly send
CLOSE requests with the same state ID, even though the NFS server rejected
the request with an NFS4ERR_OLD_STATEID (10024) error code. This update
ensures that the NFSv4 client no longer re-sends the same CLOSE request
after receiving NFS4ERR_OLD_STATEID.

The system must be rebooted for this update to take effect.
--

SL5
  x86_64
    kernel-2.6.18-371.11.1.el5.x86_64.rpm
    kernel-debug-2.6.18-371.11.1.el5.x86_64.rpm
    kernel-debug-debuginfo-2.6.18-371.11.1.el5.x86_64.rpm
    kernel-debug-devel-2.6.18-371.11.1.el5.x86_64.rpm
    kernel-debuginfo-2.6.18-371.11.1.el5.x86_64.rpm
    kernel-debuginfo-common-2.6.18-371.11.1.el5.x86_64.rpm
    kernel-devel-2.6.18-371.11.1.el5.x86_64.rpm
    kernel-headers-2.6.18-371.11.1.el5.x86_64.rpm
    kernel-xen-2.6.18-371.11.1.el5.x86_64.rpm
    kernel-xen-debuginfo-2.6.18-371.11.1.el5.x86_64.rpm
    kernel-xen-devel-2.6.18-371.11.1.el5.x86_64.rpm
  i386
    kernel-2.6.18-371.11.1.el5.i686.rpm
    kernel-PAE-2.6.18-371.11.1.el5.i686.rpm
    kernel-PAE-debuginfo-2.6.18-371.11.1.el5.i686.rpm
    kernel-PAE-devel-2.6.18-371.11.1.el5.i686.rpm
    kernel-debug-2.6.18-371.11.1.el5.i686.rpm
    kernel-debug-debuginfo-2.6.18-371.11.1.el5.i686.rpm
    kernel-debug-devel-2.6.18-371.11.1.el5.i686.rpm
    kernel-debuginfo-2.6.18-371.11.1.el5.i686.rpm
    kernel-debuginfo-common-2.6.18-371.11.1.el5.i686.rpm
    kernel-devel-2.6.18-371.11.1.el5.i686.rpm
    kernel-headers-2.6.18-371.11.1.el5.i386.rpm
    kernel-xen-2.6.18-371.11.1.el5.i686.rpm
    kernel-xen-debuginfo-2.6.18-371.11.1.el5.i686.rpm
    kernel-xen-devel-2.6.18-371.11.1.el5.i686.rpm
  noarch
    kernel-doc-2.6.18-371.11.1.el5.noarch.rpm

- Scientific Linux Development Team