Vulnerability CVE-2012-6647
Published: 2014-05-26   Modified: 2014-05-27

Description:
The futex_wait_requeue_pi function in kernel/futex.c in the Linux kernel before 3.5.1 does not ensure that calls have two different futex addresses, which allows local users to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact via a crafted FUTEX_WAIT_REQUEUE_PI command.

See advisories in our WLB2 database:
Topic
Author
Date
Med.
Linux Kernel forbid uaddr == uaddr2 in futex_wait_requeue_pi() null dereference
Darren
15.05.2014

Type:

CWE-20

 (Improper Input Validation)

CVSS2 => (AV:L/AC:L/Au:N/C:N/I:N/A:C)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.9/10
6.9/10
3.9/10
Exploit range
Attack complexity
Authentication
Local
Low
No required
Confidentiality impact
Integrity impact
Availability impact
None
None
Complete
Affected software
Linux -> Linux kernel 

 References:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=6f7b0a2a5c0fb03be7c25bd1745baa50582348ef
https://github.com/torvalds/linux/commit/6f7b0a2a5c0fb03be7c25bd1745baa50582348ef
https://bugzilla.redhat.com/show_bug.cgi?id=1097746
http://www.openwall.com/lists/oss-security/2014/05/14/9
http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.5.1
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