USN-1243-1: Linux kernel vulnerabilities

25 October 2011

Several security issues were fixed in the kernel.

Releases

Packages

  • linux - Linux kernel

Details

It was discovered that the security fix for CVE-2010-4250 introduced a
regression. A remote attacker could exploit this to crash the system,
leading to a denial of service. (CVE-2011-1479)

Vasiliy Kulikov discovered that taskstats did not enforce access
restrictions. A local attacker could exploit this to read certain
information, leading to a loss of privacy. (CVE-2011-2494)

Vasiliy Kulikov discovered that /proc/PID/io did not enforce access
restrictions. A local attacker could exploit this to read certain
information, leading to a loss of privacy. (CVE-2011-2495)

It was discovered that the EXT4 filesystem contained multiple off-by-one
flaws. A local attacker could exploit this to crash the system, leading to
a denial of service. (CVE-2011-2695)

Christian Ohm discovered that the perf command looks for configuration
files in the current directory. If a privileged user were tricked into
running perf in a directory containing a malicious configuration file, an
attacker could run arbitrary commands and possibly gain privileges.
(CVE-2011-2905)

Vasiliy Kulikov discovered that the Comedi driver did not correctly clear
memory. A local attacker could exploit this to read kernel stack memory,
leading to a loss of privacy. (CVE-2011-2909)

Dan Kaminsky discovered that the kernel incorrectly handled random sequence
number generation. An attacker could use this flaw to possibly predict
sequence numbers and inject packets. (CVE-2011-3188)

Yogesh Sharma discovered that CIFS did not correctly handle UNCs that had
no prefixpaths. A local attacker with access to a CIFS partition could
exploit this to crash the system, leading to a denial of service.
(CVE-2011-3363)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 10.10

After a standard system update you need to reboot your computer to make
all the necessary changes.

Related notices

  • USN-1275-1: linux-image-3.0.0-13-server, linux-image-3.0.0-13-generic, linux-image-3.0.0-13-powerpc64-smp, linux, linux-image-3.0.0-13-powerpc-smp, linux-image-3.0.0-13-generic-pae, linux-image-3.0.0-13-virtual, linux-image-3.0.0-13-omap, linux-image-3.0.0-13-powerpc
  • USN-1246-1: linux-image-2.6.38-12-powerpc-smp, linux, linux-image-2.6.38-12-omap, linux-image-2.6.38-12-generic-pae, linux-image-2.6.38-12-powerpc64-smp, linux-image-2.6.38-12-powerpc, linux-image-2.6.38-12-versatile, linux-image-2.6.38-12-virtual, linux-image-2.6.38-12-server, linux-image-2.6.38-12-generic
  • USN-1244-1: linux-image-2.6.35-903-omap4, linux-ti-omap4
  • USN-1168-1: linux-image-2.6.32-33-generic, linux-image-2.6.32-33-lpia, linux, linux-image-2.6.32-33-generic-pae, linux-image-2.6.32-33-preempt, linux-image-2.6.32-33-386, linux-image-2.6.32-33-versatile, linux-image-2.6.32-33-powerpc64-smp, linux-image-2.6.32-33-powerpc, linux-image-2.6.32-33-sparc64, linux-image-2.6.32-33-sparc64-smp, linux-image-2.6.32-33-virtual, linux-image-2.6.32-33-server, linux-image-2.6.32-33-powerpc-smp, linux-image-2.6.32-33-ia64
  • USN-1240-1: linux-image-2.6.32-219-dove, linux-mvl-dove
  • USN-1228-1: linux-ti-omap4, linux-image-2.6.38-1209-omap4
  • USN-1285-1: linux-image-2.6.38-13-powerpc64-smp, linux, linux-image-2.6.38-13-versatile, linux-image-2.6.38-13-server, linux-image-2.6.38-13-powerpc, linux-image-2.6.38-13-generic, linux-image-2.6.38-13-generic-pae, linux-image-2.6.38-13-virtual, linux-image-2.6.38-13-omap, linux-image-2.6.38-13-powerpc-smp
  • USN-1216-1: linux-ec2, linux-image-2.6.32-318-ec2
  • USN-1242-1: linux-lts-backport-maverick, linux-image-2.6.35-30-generic, linux-image-2.6.35-30-virtual, linux-image-2.6.35-30-generic-pae, linux-image-2.6.35-30-server
  • USN-1236-1: linux-image-2.6.24-29-generic, linux, linux-image-2.6.24-29-lpia, linux-image-2.6.24-29-rt, linux-image-2.6.24-29-powerpc, linux-image-2.6.24-29-mckinley, linux-image-2.6.24-29-sparc64-smp, linux-image-2.6.24-29-powerpc-smp, linux-image-2.6.24-29-hppa32, linux-image-2.6.24-29-itanium, linux-image-2.6.24-29-openvz, linux-image-2.6.24-29-lpiacompat, linux-image-2.6.24-29-hppa64, linux-image-2.6.24-29-386, linux-image-2.6.24-29-virtual, linux-image-2.6.24-29-server, linux-image-2.6.24-29-sparc64, linux-image-2.6.24-29-xen, linux-image-2.6.24-29-powerpc64-smp
  • USN-1281-1: linux-ti-omap4, linux-image-2.6.38-1209-omap4
  • USN-1294-1: linux-image-3.0.0-13-server, linux-image-3.0.0-13-generic, linux-image-3.0.0-13-generic-pae, linux-image-3.0.0-13-virtual, linux-lts-backport-oneiric
  • USN-1212-1: linux-ti-omap4, linux-image-2.6.38-1209-omap4
  • USN-1241-1: linux-fsl-imx51, linux-image-2.6.31-611-imx51
  • USN-1245-1: linux-image-2.6.32-419-dove, linux-mvl-dove
  • USN-1167-1: linux-image-2.6.38-10-versatile, linux, linux-image-2.6.38-10-powerpc64-smp, linux-image-2.6.38-10-powerpc-smp, linux-image-2.6.38-10-server, linux-image-2.6.38-10-powerpc, linux-image-2.6.38-10-generic, linux-image-2.6.38-10-omap, linux-image-2.6.38-10-generic-pae, linux-image-2.6.38-10-virtual
  • USN-1220-1: linux-image-2.6.35-903-omap4, linux-ti-omap4
  • USN-1208-1: linux-mvl-dove, linux-image-2.6.32-418-dove
  • USN-1159-1: linux-image-2.6.32-417-dove, linux-mvl-dove
  • USN-1260-1: linux-image-3.0.0-1206-omap4, linux-ti-omap4
  • USN-1218-1: linux-image-2.6.32-34-powerpc-smp, linux-image-2.6.32-34-generic, linux-image-2.6.32-34-ia64, linux-image-2.6.32-34-versatile, linux-image-2.6.32-34-sparc64, linux, linux-image-2.6.32-34-sparc64-smp, linux-image-2.6.32-34-generic-pae, linux-image-2.6.32-34-server, linux-image-2.6.32-34-lpia, linux-image-2.6.32-34-preempt, linux-image-2.6.32-34-powerpc, linux-image-2.6.32-34-powerpc64-smp, linux-image-2.6.32-34-386, linux-image-2.6.32-34-virtual
  • USN-1253-1: linux-image-2.6.32-35-ia64, linux-image-2.6.32-35-powerpc-smp, linux, linux-image-2.6.32-35-server, linux-image-2.6.32-35-lpia, linux-image-2.6.32-35-generic-pae, linux-image-2.6.32-35-versatile, linux-image-2.6.32-35-sparc64-smp, linux-image-2.6.32-35-virtual, linux-image-2.6.32-35-generic, linux-image-2.6.32-35-386, linux-image-2.6.32-35-preempt, linux-image-2.6.32-35-powerpc64-smp, linux-image-2.6.32-35-sparc64, linux-image-2.6.32-35-powerpc
  • USN-1256-1: linux-lts-backport-natty, linux-image-2.6.38-12-generic-pae, linux-image-2.6.38-12-virtual, linux-image-2.6.38-12-server, linux-image-2.6.38-12-generic
  • USN-1161-1: linux-image-2.6.32-317-ec2, linux-ec2
  • USN-1203-1: linux-mvl-dove, linux-image-2.6.32-218-dove
  • USN-1162-1: linux-mvl-dove, linux-image-2.6.32-217-dove
  • USN-1239-1: linux-ec2, linux-image-2.6.32-319-ec2
  • USN-1279-1: linux-lts-backport-natty, linux-image-2.6.38-13-server, linux-image-2.6.38-13-generic, linux-image-2.6.38-13-generic-pae, linux-image-2.6.38-13-virtual