CVE-2011-4621

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2022-05-13. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.5Exploit: NoneExposed: 0

A fix is available — apply it.

The Linux kernel before 2.6.37 does not properly implement a certain clock-update optimization, which allows local users to cause a denial of service (system hang) via an application that executes code in a loop.

CVSS v3
5.5
EG Score
5.5(medium)
EPSS
35.4%
KEV
Not listed

Published

May 17, 2012

Last Modified

April 29, 2026

Advisory Details (3)

Auto-updated May 29, 2026
Patch available. Sources: github_commit, redhat.
github_commit

commit f26f9aff6aaf (torvalds/linux)

Fix landed in torvalds/linux commit f26f9aff6aaf — awaiting tagged release

https://github.com/torvalds/linux/commit/f26f9aff6aaf67e9a430d16c266f91b13a5bff64
redhat Patch Available

769711 – (CVE-2011-4621) CVE-2011-4621 kernel: tight loop and no preemption can cause system stall

Affected: Red Hat Enterprise Linux 5 and Red Hat Enterprise MRG 2.

https://bugzilla.redhat.com/show_bug.cgi?id=769711
generic

oss-security - Re: CVE Request -- kernel: tight loop and no preemption can cause system stall

http://www.openwall.com/lists/oss-security/2011/12/21/6

Patch Availability(5)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-image-2.6.35-903-omap4 (2.6.35-903.32) @ maverick2026-05-29ubuntu
ubuntulinux-image-2.6.35-27-virtual (2.6.35-27.48) @ maverick2026-05-29ubuntu
ubuntulinux-image-2.6.38-1209-omap4 (2.6.38-1209.15) @ natty2026-05-29ubuntu
ubuntulinux-image-2.6.35-30-virtual (2.6.35-30.56~lucid1) @ lucid2026-05-29ubuntu
redhatkernel-0:2.6.32-220.2.1.el62011-12-22redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(5)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 10× in last 7d / 44× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-06 16:23 UTCEPSS rescore
  2. 2026-07-06 02:19 UTCEPSS rescore
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  1. 2026-06-19 19:22 UTCEPSS rescore
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  37. 2026-05-29 13:41 UTCEPSS rescore
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  39. 2026-05-29 04:34 UTCEG score recompute
  40. 2026-05-29 04:34 UTCVendor advisory
  41. 2026-05-29 04:34 UTCGHSA enrichment
  42. 2026-05-28 13:42 UTCEPSS rescore
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  45. 2026-05-27 13:38 UTCEPSS rescore
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  61. 2026-05-18 21:29 UTCEPSS rescore
  62. 2026-05-18 21:29 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2011-4621?
CVE-2011-4621 is a medium vulnerability published on May 17, 2012. The Linux kernel before 2.6.37 does not properly implement a certain clock-update optimization, which allows local users to cause a denial of service (system hang) via an application that executes code in a loop.
When was CVE-2011-4621 disclosed?
CVE-2011-4621 was first published in the National Vulnerability Database on May 17, 2012, with the most recent update on April 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2011-4621 actively exploited?
CVE-2011-4621 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 35.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2011-4621?
CVE-2011-4621 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2011-4621?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2011-4621, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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