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Debian: Security update for Linux

Several vulnerabilities have been discovered in the Linux kernel that may lead to a denial of service or privilege escalation. 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.

Updated packages are available from security.debian.org.

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

- ----------------------------------------------------------------------
Debian Security Advisory DSA-2443-1                security@debian.org
http://www.debian.org/security/                           Dann Frazier
March 26, 2012                      http://www.debian.org/security/faq
- ----------------------------------------------------------------------

Package        : linux-2.6
Vulnerability  : privilege escalation/denial of service
Problem type   : local
Debian-specific: no
CVE Id(s)      : CVE-2009-4307 CVE-2011-1833 CVE-2011-4347 CVE-2012-0045
                CVE-2012-1090 CVE-2012-1097

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-2009-4307

   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.

CVE-2011-1833

   Vasiliy Kulikov of Openwall and Dan Rosenberg discovered an information
   leak in the eCryptfs filesystem. Local users were able to mount arbitrary
   directories.

CVE-2011-4347

   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).

CVE-2012-0045

   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.

CVE-2012-1090

   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.

CVE-2012-1097

   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.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: http://www.debian.org/security/

Mailing list: debian-security-announce@lists.debian.org
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