What is CVE-2009-2406?

CVE-2009-2406 is a vulnerability in Linux Kernel, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. Published 2009-07-31.

Is CVE-2009-2406 known to be exploited?

4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Linux Kernel

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 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.

Vulnerability class: Buffer Overflow

Published 2009-07-31 · last modified 2026-06-16.

CVSS v2 metric

CVSS v2 base score 6.9 (Medium). Vector: AV:L/AC:M/Au:N/C:C/I:C/A:C. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.005 (40.4th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 40.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Linux Kernel — versions 2.6.24.7, 2.6.25.15
Linux Kernel — versions 2.2.6, 2.6, 2.6.0

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

Public proof-of-concept exploits

References

www.securityfocus.com/bid/35851 (Patch, vdb-entry)
secunia.com/advisories/35985 (Vendor Advisory, third-party-advisory)
secunia.com/advisories/36131 (third-party-advisory)
www.securityfocus.com/archive/1/505334/100/0/threaded (mailing-list)
git.kernel.org/
secunia.com/advisories/37471 (third-party-advisory)
risesecurity.org/advisories/RISE-2009002.txt (Exploit)
www.redhat.com/archives/fedora-package-announce/2009-August/msg00223.html (vendor-advisory)
www.debian.org/security/2009/dsa-1844 (vendor-advisory, Patch)
www.ubuntu.com/usn/usn-807-1 (vendor-advisory)

Frequently asked questions

What is CVE-2009-2406?: CVE-2009-2406 is a vulnerability in Linux Kernel, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. Published 2009-07-31.
Is CVE-2009-2406 known to be exploited?: 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.