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Fencer Vulns
medium 6.9

CVE-2009-2406 json

Stack-based buffer overflow in the parse_tag_11_packet function in fs/ecryptfs/keystore.c in the eCryptfs subsystem in the Linux kernel bef…

published 2009-07-31 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-2402

cvss
6.9
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 42%
public exploits
0
none known

Summary

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.

Patch / fix

  • kernel RHEL 5.3 EUS, RHEL 5 2.6.18-128.4.1.el5
  • kernel-PAE RHEL 5.3 EUS, RHEL 5 2.6.18-128.4.1.el5
  • kernel-xen RHEL 5.3 EUS, RHEL 5 2.6.18-128.4.1.el5
  • kernel-kdump RHEL 5.3 EUS, RHEL 5 2.6.18-128.4.1.el5
  • kernel-debuginfo-common RHEL 5.3 EUS, RHEL 5 2.6.18-128.4.1.el5

red hat advisories RHSA-2009:1193

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2009-2406 updated cvss 7.2

kernel: ecryptfs stack overflow in parse_tag_11_packet()

  • Red Hat Enterprise Linux (v. 5 server) kernel 2.6.18-128.4.1.el5, kernel-PAE 2.6.18-128.4.1.el5, kernel-xen 2.6.18-128.4.1.el5, kernel-kdump 2.6.18-128.4.1.el5, kernel-debuginfo-common 2.6.18-128.4.1.el5 Red Hat Enterprise Linux Desktop (v. 5 client) kernel 2.6.18-128.4.1.el5, kernel-PAE 2.6.18-128.4.1.el5, kernel-xen 2.6.18-128.4.1.el5, kernel-debuginfo-common 2.6.18-128.4.1.el5 Red Hat Enterprise Linux EUS (v. 5.3 server) kernel 2.6.18-128.4.1.el5, kernel-PAE 2.6.18-128.4.1.el5, kernel-xen 2.6.18-128.4.1.el5, kernel-kdump 2.6.18-128.4.1.el5, kernel-debuginfo-common 2.6.18-128.4.1.el5
    fixed: vendor fix RHSA-2009:1193

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.50% chance of exploitation in the next 30 days, higher than 42% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • risesecurity.org http://risesecurity.org/advisories/RISE-2009002.txt referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 6.9 AV:L/AC:M/Au:N/C:C/I:C/A:C

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.