What is CVE-2009-0343?

CVE-2009-0343 is a vulnerability in Linux Kernel, classified under CWE-264. Published 2009-01-29.

Is CVE-2009-0343 known to be exploited?

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

Vulnerability in Linux Kernel

CVE-2009-0343

Niels Provos Systrace 1.6f and earlier on the x86_64 Linux platform allows local users to bypass intended access restrictions by making a 32-bit syscall with a syscall number that corresponds to a policy-compliant 64-bit syscall, related to race conditions that occur in monitoring 64-bit processes.

Published 2009-01-29 · last modified 2026-06-16.

CVSS v2 metric

CVSS v2 base score 7.2 (High). Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.008 (55.4th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Linux Kernel — versions _nil_
Niels Provos Systrace — versions 1.1, 1.2, 1.3

Weakness classification (CWE)

CWE-264

Public proof-of-concept exploits

ARPSyndicate/cve-scores

References

www.citi.umich.edu/u/provos/systrace/
www.securityfocus.com/archive/1/500377/100/0/threaded (mailing-list)
scary.beasts.org/security/CESA-2009-001.html (Exploit)
scarybeastsecurity.blogspot.com/2009/01/bypassing-syscall-filtering.html
www.securityfocus.com/bid/33417 (Exploit, vdb-entry)

Frequently asked questions

What is CVE-2009-0343?: CVE-2009-0343 is a vulnerability in Linux Kernel, classified under CWE-264. Published 2009-01-29.
Is CVE-2009-0343 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.