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CVE-2012-6647

19
FAUCET Score

CVE-2012-6647 describes a denial-of-service vulnerability in the Linux kernel before version 3.5.1, specifically within the futex_wait_requeue_pi function. Local users can exploit this flaw by crafting a FUTEX_WAIT_REQUEUE_PI command that leads to a NULL pointer dereference, causing a system crash. The vulnerability has a CVSS score of 4.9, indicating a low attack complexity and requiring local access, with the primary impact being system availability. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 3.4.9CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
3.0CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:3.0:rc1:*:*:*:*:*:*
3.0CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:3.0:rc2:*:*:*:*:*:*
3.0CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:3.0:rc3:*:*:*:*:*:*
3.0CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:3.0:rc4:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

4.9MEDIUM

AV:L/AC:L/Au:N/C:N/I:N/A:C

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Exploitability Score
3.9
Impact Score
6.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
0.38%
Probability of exploitation in next 30 days
EPSS Percentile
30.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0038 is in the 53rd percentile among its peer group of 3,050 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: kernel-0:2.6.32-431.23.3.el6
View patch

Vendor Advisories (1)

redhatCVE-2012-6647Moderate

Kernel: futex: forbid uaddr == uaddr2 in futex_wait_requeue_pi()

Jul 20, 2012

References

git.kernel.org
bugzilla.redhat.com / show_bug.cgi
github.com / torvalds/linux/commit/6f7b0a2a5c0fb03be7c25bd1745baa50582348ef
kernel.org / pub/linux/kernel/v3.x/ChangeLog-3.5.1
openwall.com / lists/oss-security/2014/05/14/9