Debian Security Advisory
DSA-2443-1 linux-2.6 -- privilege escalation/denial of service
- Date Reported:
- 26 Mar 2012
- Affected Packages:
- Security database references:
- In Mitre's CVE dictionary: CVE-2009-4307, CVE-2011-1833, CVE-2011-4347, CVE-2012-0045, CVE-2012-1090, CVE-2012-1097.
- More information:
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:
Nageswara R Sastry reported an issue in the ext4 filesystem. Local users with the privileges to mount a filesystem can cause a denial of service (BUG) by providing a s_log_groups_per_flex value greater than 31.
Vasiliy Kulikov of Openwall and Dan Rosenberg discovered an information leak in the eCryptfs filesystem. Local users were able to mount arbitrary directories.
Sasha Levin reported an issue in the device assignment functionality in KVM. Local users with permission to access /dev/kvm could assign unused pci devices to a guest and cause a denial of service (crash).
Stephan Barwolf reported an issue in KVM. Local users in a 32-bit guest running on a 64-bit system can crash the guest with a syscall instruction.
CAI Qian reported an issue in the CIFS filesystem. A reference count leak can occur during the lookup of special files, resulting in a denial of service (oops) on umount.
H. Peter Anvin reported an issue in the regset infrastructure. Local users can cause a denial of service (NULL pointer dereference) by triggering the write methods of readonly regsets.
For the stable distribution (squeeze), this problem has been fixed in version 2.6.32-41squeeze2.
The following matrix lists additional source packages that were rebuilt for compatibility with or to take advantage of this update:
Debian 6.0 (squeeze) user-mode-linux 2.6.32-1um-4+41squeeze2
We recommend that you upgrade your linux-2.6 and user-mode-linux packages.
Thanks to Micah Anderson for proof reading this text.