Debian DSA-2389-1 : linux-2.6 - privilege escalation/denial of service/information leak
Medium Nessus Plugin ID 57583
SynopsisThe remote Debian host is missing a security-related update.
DescriptionSeveral 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
Andrea Righi reported an issue in KSM, a memory-saving
de-duplication feature. By exploiting a race with
exiting tasks, local users can cause a kernel oops,
resulting in a denial of service.
Dan Rosenberg discovered an issue in the INET socket
monitoring interface. Local users could cause a denial
of service by injecting code and causing the kernel to
execute an infinite loop.
Eric Dumazet reported an information leak in the raw
packet socket implementation.
Han-Wen Nienhuys reported a local denial of service
issue in the FUSE (Filesystem in Userspace) support in
the Linux kernel. Local users could cause a buffer
overflow, leading to a kernel oops and resulting in a
denial of service.
Carlos Maiolino reported an issue in the XFS filesystem.
A local user with the ability to mount a filesystem
could corrupt memory resulting in a denial of service or
possibly gain elevated privileges.
David Howells reported an issue in the kernel's access
key retention system which allow local users to cause a
kernel oops leading to a denial of service.
Paolo Bonzini of Red Hat reported an issue in the ioctl
passthrough support for SCSI devices. Users with
permission to access restricted portions of a device
(e.g. a partition or a logical volume) can obtain access
to the entire device by way of the SG_IO ioctl. This
could be exploited by a local user or privileged VM
guest to achieve a privilege escalation.
Maynard Johnson reported an issue with the perf support
on POWER7 systems that allows local users to cause a
denial of service.
Jan Kiszka reported an issue in the KVM PIT timer
support. Local users with the permission to use KVM can
cause a denial of service by starting a PIT timer
without first setting up the irqchip.
Ben Hutchings reported various bounds checking issues
within the ROSE protocol support in the kernel. Remote
users could possibly use this to gain access to
sensitive memory or cause a denial of service.
SolutionUpgrade the linux-2.6 and user-mode-linux packages.
For the stable distribution (squeeze), this problem has been fixed in
version 2.6.32-39squeeze1. Updates for issues impacting the oldstable
distribution (lenny) will be available soon.
The following matrix lists additional source packages that were
rebuilt for compatibility with or to take advantage of this update :
Debian 6.0 (squeeze)