What is CVE-2011-2521?

CVE-2011-2521 is a Medium severity Linux kernel vulnerability with a CVSS score of 4.9 out of 10. CVE-2011-2521 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2011-2521?

CVE-2011-2521 has a CVSS score of 4.9 out of 10, rated Medium severity. The vector string is AV:L/AC:L/Au:N/C:N/I:N/A:C.

Is there a patch available for CVE-2011-2521?

No patch is currently available for CVE-2011-2521. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

Is CVE-2011-2521 actively exploited?

CVE-2011-2521 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2011-2521

Medium

The x86_assign_hw_event function in arch/x86/kernel/cpu/perf_event.c in the Performance Events subsystem in the Linux kernel before 2.6.39 does not properly calculate counter values, which allows local users to cause a denial of service (panic) via the perf program.

Package Linux Kernel

Published 2012-05-24

Last modified 2026-04-29

CVSS version 2.0

Patch available

Awaiting data

CVSS 2.0 score

4.9

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

User Interaction

Scope

Confidentiality

Low

Integrity

None

Availability

Vector string

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

Weakness type

CWE-189

CVE-2011-2521 is classified as CWE-189

See CWE-189 on MITRE CWE for full details on this weakness type.

References

The following references provide additional information about CVE-2011-2521 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Ftp
http://ftp.osuosl.org/pub/linux/kernel/v2.6/ChangeLog-2.6.39

Broken Link
Openwall
http://www.openwall.com/lists/oss-security/2011/07/06/4

Mailing List Third Party Advisory
Red Hat
https://bugzilla.redhat.com/show_bug.cgi?id=719228

Issue Tracking Third Party Advisory
Kernel patch commit
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=fc66c5210ec2539e800e87d7b3a985323c7be96e
Patch
Kernel patch commit
https://github.com/torvalds/linux/commit/fc66c5210ec2539e800e87d7b3a985323c7be96e
Patch

Details

CVE ID CVE-2011-2521

Severity Medium

CVSS score 4.9 / 10

CVSS version 2.0

Published 2012-05-24

Modified 2026-04-29

KEV No

Patch Awaiting data

Package linux

Frequently asked questions

What is CVE-2011-2521?

CVE-2011-2521 is a Medium severity Linux kernel vulnerability with a CVSS score of 4.9 out of 10 . CVE-2011-2521 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2011-2521?

CVE-2011-2521 has a CVSS score of 4.9 out of 10, rated Medium severity (CVSS 2.0). The vector string is AV:L/AC:L/Au:N/C:N/I:N/A:C.
Is there a patch available for CVE-2011-2521?

No patch is currently available for CVE-2011-2521. Monitor the NIST NVD and your Linux distribution's security advisories for updates.
Is CVE-2011-2521 actively exploited?

No — CVE-2011-2521 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.