Oracle Linux 5 : kernel (ELSA-2015-1042)

This script is Copyright (C) 2015-2016 Tenable Network Security, Inc.

Synopsis :

The remote Oracle Linux host is missing one or more security updates.

Description :

From Red Hat Security Advisory 2015:1042 :

Updated kernel packages that fix one security issue and several bugs
are now available for Red Hat Enterprise Linux 5.

Red Hat Product Security has rated this update as having Important
security impact. A Common Vulnerability Scoring System (CVSS) base
score, which gives a detailed severity rating, is available from the
CVE link in the References section.

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

* It was found that the Linux kernel's implementation of vectored pipe
read and write functionality did not take into account the I/O vectors
that were already processed when retrying after a failed atomic access
operation, potentially resulting in memory corruption due to an I/O
vector array overrun. A local, unprivileged user could use this flaw
to crash the system or, potentially, escalate their privileges on the
system. (CVE-2015-1805, Important)

The security impact of this issue was discovered by Red Hat.

This update fixes the following bugs :

* Due to a bug in the lpfc_device_reset_handler() function, a scsi
command timeout could lead to a system crash. With this update,
lpfc_device_reset_handler recovers storage without crashing.

* Due to the code decrementing the reclaim_in_progress counter without
having incremented it first, severe spinlock contention occurred in
the shrink_zone() function even though the vm.max_reclaims_in_progress
feature was set to 1. This update provides a patch fixing the
underlying source code, and spinlock contention no longer occurs in
this scenario. (BZ#1164105)

* A TCP socket using SACK that had a retransmission but recovered from
it, failed to reset the retransmission timestamp. As a consequence, on
certain connections, if a packet had to be re-transmitted, the
retrans_stamp variable was only cleared when the next acked packet was
received. This could lead to an early abortion of the TCP connection
if this next packet also got lost. With this update, the socket clears
retrans_stamp when the recovery is completed, thus fixing the bug.

* Previously, the signal delivery paths did not clear the TS_USEDFPU
flag, which could cause problems in the switch_to() function and lead
to floating-point unit (FPU) corruption. With this update, TS_USEDFPU
is cleared as expected, and FPU is no longer under threat of
corruption. (BZ#1193505)

* A race condition in the exit_sem() function previously caused the
semaphore undo list corruption. As a consequence, a kernel crash could
occur. The corruption in the semaphore undo list has been fixed, and
the kernel no longer crashes in this situation. (BZ#1124574)

* Previously, when running the 'virsh blockresize [Device] [Newsize]'
command to resize the disk, the new size was not reflected in a Red
Hat Enterprise Linux 5 Virtual Machine (VM). With this update, the new
size is now reflected online immediately in a Red Hat Enterprise Linux
5 VM so it is no longer necessary to reboot the VM to see the new disk
size. (BZ#1200855)

All kernel users are advised to upgrade to these updated packages,
which contain backported patches to correct these issues. The system
must be rebooted for this update to take effect.

See also :

Solution :

Update the affected kernel packages.

Risk factor :

High / CVSS Base Score : 7.2
CVSS Temporal Score : 6.0
Public Exploit Available : true

Family: Oracle Linux Local Security Checks

Nessus Plugin ID: 83985 ()

Bugtraq ID: 74951

CVE ID: CVE-2015-1805

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