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Test ID:
Category:Red Hat Local Security Checks
Title:RedHat Update for kernel RHSA-2015:1042-01
Summary:The remote host is missing an update for the 'kernel'; package(s) announced via the referenced advisory.
The remote host is missing an update for the 'kernel'
package(s) announced via the referenced advisory.

Vulnerability Insight:
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,

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. (BZ#1070964)

* 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.

* 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. (BZ#1205521)

* 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.

* 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 t ...

Description truncated, please see the referenced URL(s) for more information.

Affected Software/OS:
kernel on Red Hat Enterprise Linux (v. 5 server)

Please Install the Updated Packages.

CVSS Score:

CVSS Vector:

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2015-1805
BugTraq ID: 74951
Debian Security Information: DSA-3290 (Google Search)
RedHat Security Advisories: RHSA-2015:1042
RedHat Security Advisories: RHSA-2015:1081
RedHat Security Advisories: RHSA-2015:1082
RedHat Security Advisories: RHSA-2015:1120
RedHat Security Advisories: RHSA-2015:1137
RedHat Security Advisories: RHSA-2015:1138
RedHat Security Advisories: RHSA-2015:1190
RedHat Security Advisories: RHSA-2015:1199
RedHat Security Advisories: RHSA-2015:1211
SuSE Security Announcement: SUSE-SU-2015:1224 (Google Search)
SuSE Security Announcement: SUSE-SU-2015:1324 (Google Search)
SuSE Security Announcement: SUSE-SU-2015:1478 (Google Search)
SuSE Security Announcement: SUSE-SU-2015:1487 (Google Search)
SuSE Security Announcement: SUSE-SU-2015:1488 (Google Search)
SuSE Security Announcement: SUSE-SU-2015:1489 (Google Search)
SuSE Security Announcement: SUSE-SU-2015:1490 (Google Search)
SuSE Security Announcement: SUSE-SU-2015:1491 (Google Search)
SuSE Security Announcement: SUSE-SU-2015:1592 (Google Search)
SuSE Security Announcement: SUSE-SU-2015:1611 (Google Search)
CopyrightCopyright (C) 2015 Greenbone Networks GmbH

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