CVE-2012-6647

Severity: medium (CVSS 4.9 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2014-05-26 · updated 2026-06-16
Weakness: CWE-20

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.

Affected products

Linux kernel: through 3.4.9; 3.0-rc1, 3.0-rc2, 3.0-rc3, 3.0-rc4, 3.0-rc5, 3.0-rc6 (+223)

References

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=6f7b0a2a5c0fb03be7c25bd1745baa50582348ef
http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.5.1
http://www.openwall.com/lists/oss-security/2014/05/14/9
https://bugzilla.redhat.com/show_bug.cgi?id=1097746
https://github.com/torvalds/linux/commit/6f7b0a2a5c0fb03be7c25bd1745baa50582348ef
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=6f7b0a2a5c0fb03be7c25bd1745baa50582348ef
http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.5.1
http://www.openwall.com/lists/oss-security/2014/05/14/9
https://bugzilla.redhat.com/show_bug.cgi?id=1097746
https://github.com/torvalds/linux/commit/6f7b0a2a5c0fb03be7c25bd1745baa50582348ef

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