CVE-2011-2184

The key_replace_session_keyring function in security/keys/process_keys.c in the Linux kernel before 2.6.39.1 does not initialize a certain structure member, which allows local users to cause a denial of service (NULL pointer dereference and OOPS) or possibly have unspecified other impact via a KEYCTL_SESSION_TO_PARENT argument to the keyctl function, a different vulnerability than CVE-2010-2960.

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://alt.swiecki.net/linux_kernel/sys_open-kmem_cache_alloc-2.6.39-rc4.txt
• http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=f7285b5d631fd6096b11c6af0058ed3a2b30ef4e
• http://securityreason.com/securityalert/8371
• http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.39.1
• http://www.openwall.com/lists/oss-security/2011/06/03/2
• http://www.openwall.com/lists/oss-security/2011/06/06/2
• https://lkml.org/lkml/2011/5/23/199
• https://lkml.org/lkml/2011/5/24/502
• https://lkml.org/lkml/2011/5/25/265