How severe is CVE-2012-6647?

CVE-2012-6647 has a CVSS 2.0 base score of 4.9, rated medium severity.

Is CVE-2012-6647 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2012-6647?

CVE-2012-6647 primarily affects Linux Linux Kernel. In total, 230 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2012-6647?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2012-6647 published?

CVE-2012-6647 was published on 2014-05-26 and last updated on 2026-06-16.

CVE-2012-6647

CVE-2012-6647 is a medium-severity vulnerability in Linux Linux Kernel with a CVSS 2.0 base score of 4.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-20.

Key facts

Severity: Medium (CVSS 2.0 base score 4.9)
EPSS exploit prediction: 0% (30th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Linux Linux Kernel
Published: 2014-05-26
Last modified: 2026-06-16

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.

Frequently asked questions

What is CVE-2012-6647?: 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.
How severe is CVE-2012-6647?: CVE-2012-6647 has a CVSS 2.0 base score of 4.9, rated medium severity.
Is CVE-2012-6647 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2012-6647?: CVE-2012-6647 primarily affects Linux Linux Kernel. In total, 230 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2012-6647?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2012-6647 published?: CVE-2012-6647 was published on 2014-05-26 and last updated on 2026-06-16.

References

Affected products (230)

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.0:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.0:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.0:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.0:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.0:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.0:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.0:rc7:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.0.1:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.0.2:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.0.3:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.0.4:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.0.5:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.0.6:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.0.7:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.0.8:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.0.9:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.0.10:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.0.11:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.0.12:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.0.13:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.0.14:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.0.15:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.0.16:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.0.17:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.0.18:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.0.19:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.0.20:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.0.21:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.0.22:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.0.23:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.0.24:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.0.25:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.0.26:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.0.27:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.0.28:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.0.29:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.0.30:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.0.31:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.0.32:*:*:*:*:*:*:*

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