Debian: DSA-2469-1 Critical: Linux-2.6 Privilege Escalation DoS

Several vulnerabilities have been discovered in the Linux kernel that may lead
to a denial of service or privilege escalation. The Common Vulnerabilities and
Exposures project identifies the following problems:

CVE-2011-4086

Eric Sandeen reported an issue in the journaling layer for EXT4 filesystems
(jbd2). Local users can cause buffers to be accessed after they have been
torn down, resulting in a denial of service (DoS) due to a system crash.

CVE-2012-0879

Louis Rilling reported two reference counting issues in the CLONE_IO
feature of the kernel. Local users can prevent io context structures
from being freed, resulting in a denial of service.

CVE-2012-1601

Michael Ellerman reported an issue in the KVM subsystem. Local users could
cause a denial of service (NULL pointer dereference) by creating VCPUs
before a call to KVM_CREATE_IRQCHIP.

CVE-2012-2123

Steve Grubb reported in an issue in fcaps, a filesystem-based capabilities
system. Personality flags set us...