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Fencer Vulns
low 3.6

CVE-2009-0835 json

The __secure_computing function in kernel/seccomp.c in the seccomp subsystem in the Linux kernel 2.6.28.7 and earlier on the x86_64 platfor…

published 2009-03-06 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-0832

cvss
3.6
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 60%
public exploits
1
Exploit-DB

Summary

The __secure_computing function in kernel/seccomp.c in the seccomp subsystem in the Linux kernel 2.6.28.7 and earlier on the x86_64 platform, when CONFIG_SECCOMP is enabled, does not properly handle (1) a 32-bit process making a 64-bit syscall or (2) a 64-bit process making a 32-bit syscall, which allows local users to bypass intended access restrictions via crafted syscalls that are misinterpreted as (a) stat or (b) chmod, a related issue to CVE-2009-0342 and CVE-2009-0343.

Patch / fix

  • kernel-rt enterprise mrg 1 2.6.24.7-111.el5rt
  • kernel-rt-trace enterprise mrg 1 2.6.24.7-111.el5rt
  • kernel-rt-vanilla enterprise mrg 1 2.6.24.7-111.el5rt
  • kernel-rt-debuginfo-common enterprise mrg 1 2.6.24.7-111.el5rt

red hat advisories RHSA-2009:0451

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-2009-0835 updated cvss 3.6

kernel: x86-64: seccomp: 32/64 syscall hole

  • Red Hat MRG Realtime for RHEL 5 Server kernel-rt 2.6.24.7-111.el5rt, kernel-rt-trace 2.6.24.7-111.el5rt, kernel-rt-vanilla 2.6.24.7-111.el5rt, kernel-rt-debuginfo-common 2.6.24.7-111.el5rt
    fixed: vendor fix RHSA-2009:0451

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

Timeline

  1. First public exploit (EDB-32829)
  2. Published

Exploit prediction

0.93% chance of exploitation in the next 30 days, higher than 60% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-32829 Linux Kernel 2.6.x - 'seccomp' System Call Security Bypass local, 2009-03-02
  • scary.beasts.org http://scary.beasts.org/security/CESA-2009-001.html referenced PoC, tagged "exploit" by a source, unverified
  • marc.info http://marc.info/?l=linux-kernel&m=123579069630311&w=2 referenced PoC, tagged "exploit" by a source, unverified
  • bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=487255 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 3.6 AV:L/AC:L/Au:N/C:P/I:P/A:N

Classification

Weakness
  • CWE-264 Permissions, Privileges, and Access Controls
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.