Synopsis: Low: kernel security and bug fix update
Issue Date: 2013-03-05
CVE Numbers: CVE-2012-3400
This update fixes the following security issues:
* Buffer overflow flaws were found in the udf_load_logicalvol() function
in the Universal Disk Format (UDF) file system implementation in the Linux
kernel. An attacker with physical access to a system could use these flaws
to cause a denial of service or escalate their privileges. (CVE-2012-3400,
This update also fixes the following bugs:
* Previously, race conditions could sometimes occur in interrupt handling
on the Emulex BladeEngine 2 (BE2) controllers, causing the network adapter
to become unresponsive. This update provides a series of patches for the
be2net driver, which prevents the race from occurring. The network cards
using BE2 chipsets no longer hang due to incorrectly handled interrupt
* A boot-time memory allocation pool (the DMI heap) is used to keep the
list of Desktop Management Interface (DMI) devices during the system boot.
Previously, the size of the DMI heap was only 2048 bytes on the AMD64 and
Intel 64 architectures and the DMI heap space could become easily depleted
on some systems, such as the IBM System x3500 M2. A subsequent OOM failure
could, under certain circumstances, lead to a NULL pointer entry being
stored in the DMI device list. Consequently, scanning of such a corrupted
DMI device list resulted in a kernel panic. The boot-time memory
allocation pool for the AMD64 and Intel 64 architectures has been enlarged
to 4096 bytes and the routines responsible for populating the DMI device
list have been modified to skip entries if their name string is NULL. The
kernel no longer panics in this scenario.
* The size of the buffer used to print the kernel taint output on kernel
panic was too small, which resulted in the kernel taint output not being
printed completely sometimes. With this update, the size of the buffer has
been adjusted and the kernel taint output is now displayed properly.
* The code to print the kernel taint output contained a typographical
error. Consequently, the kernel taint output, which is displayed on kernel
panic, could not provide taint error messages for unsupported hardware.
This update fixes the typo and the kernel taint output is now displayed
The system must be rebooted for this update to take effect.
– Scientific Linux Development Team