CVE-2012-1146

The mem_cgroup_usage_unregister_event function in mm/memcontrol.c in the Linux kernel before 3.2.10 does not properly handle multiple events that are attached to the same eventfd, which allows local users to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact by registering memory threshold events.

Weakness

A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit.

Affected Software

Potential Mitigations

References

• http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=371528caec553785c37f73fa3926ea0de84f986f
• http://lists.fedoraproject.org/pipermail/package-announce/2012-March/075781.html
• http://lists.opensuse.org/opensuse-security-announce/2012-04/msg00021.html
• http://secunia.com/advisories/48898
• http://secunia.com/advisories/48964
• http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.2.10
• http://www.openwall.com/lists/oss-security/2012/03/07/3
• https://bugzilla.redhat.com/show_bug.cgi?id=800813
• https://exchange.xforce.ibmcloud.com/vulnerabilities/73711
• https://github.com/torvalds/linux/commit/371528caec553785c37f73fa3926ea0de84f986f