Scientific Linux Security Update : kernel on SL5.x i386/x86_64

Low Nessus Plugin ID 71305


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


- An information leak flaw was found in the way the Xen hypervisor handled error conditions when reading guest memory during certain guest-originated operations, such as port or memory mapped I/O writes. A privileged user in a fully-virtualized guest could use this flaw to leak hypervisor stack memory to a guest. (CVE-2013-4355, Moderate)

This update also fixes the following bugs :

- A previous fix to the kernel did not contain a memory barrier in the percpu_up_write() function. Consequently, under certain circumstances, a race condition could occur leading to memory corruption and a subsequent kernel panic. This update introduces a new memory barrier pair, light_mb() and heavy_mb(), for per-CPU basis read and write semaphores (percpu-rw- semaphores) ensuring that the race condition can no longer occur. In addition, the read path performance of 'percpu-rw-semaphores' has been improved.

- Due to a bug in the tg3 driver, systems that had the Wake-on-LAN (WOL) feature enabled on their NICs could not have been woken up from suspension or hibernation using WOL. A missing pci_wake_from_d3() function call has been added to the tg3 driver, which ensures that WOL functions properly by setting the PME_ENABLE bit.

- Due to an incorrect test condition in the mpt2sas driver, the driver was unable to catch failures to map a SCSI scatter-gather list. The test condition has been corrected so that the mpt2sas driver now handles SCSI scatter-gather mapping failures as expected.

- A previous patch to the kernel introduced the 'VLAN tag re-insertion' workaround to resolve a problem with incorrectly handled VLAN-tagged packets with no assigned VLAN group while the be2net driver was in promiscuous mode. However, this solution led to packet corruption and a subsequent kernel oops if such a processed packed was a GRO packet. Therefore, a patch has been applied to restrict VLAN tag re-insertion only to non-GRO packets.
The be2net driver now processes VLAN-tagged packets with no assigned VLAN group correctly in this situation.

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


Update the affected packages.

See Also

Plugin Details

Severity: Low

ID: 71305

File Name: sl_20131205_kernel_on_SL5_x.nasl

Version: $Revision: 1.1 $

Type: local

Agent: unix

Published: 2013/12/10

Modified: 2013/12/10

Dependencies: 12634

Risk Information

Risk Factor: Low


Base Score: 1.5

Vector: CVSS2#AV:L/AC:M/Au:S/C:P/I:N/A:N

Vulnerability Information

CPE: x-cpe:/o:fermilab:scientific_linux

Required KB Items: Host/local_checks_enabled, Host/cpu, Host/RedHat/release, Host/RedHat/rpm-list

Patch Publication Date: 2013/12/05

Reference Information

CVE: CVE-2013-4355