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Fencer Vulns
low 3.6

CVE-2009-0834 json

The audit_syscall_entry function in the Linux kernel 2.6.28.7 and earlier on the x86_64 platform does not properly handle (1) a 32-bit proc…

published 2009-03-06 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-0831

cvss
3.6
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 38%
public exploits
0
none known

Summary

The audit_syscall_entry function in the Linux kernel 2.6.28.7 and earlier on the x86_64 platform 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 certain syscall audit configurations via crafted syscalls, a related issue to CVE-2009-0342 and CVE-2009-0343.

Patch / fix

  • kernel RHEL 5 2.6.18-128.1.10.el5
  • kernel-PAE RHEL 5 2.6.18-128.1.10.el5
  • kernel-xen RHEL 5 2.6.18-128.1.10.el5
  • kernel-kdump RHEL 5 2.6.18-128.1.10.el5
  • kernel-debuginfo-common RHEL 5 2.6.18-128.1.10.el5
  • kernel RHEL 4 2.6.9-78.0.22.EL
  • kernel-smp RHEL 4 2.6.9-78.0.22.EL
  • kernel-xenU RHEL 4 2.6.9-78.0.22.EL

red hat advisories RHSA-2009:0473RHSA-2010:0079RHSA-2009:0459RHSA-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-2009-0834 updated cvss 3.6

kernel: x86-64: syscall-audit: 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 Enterprise Linux (v. 5 server) kernel 2.6.18-128.1.10.el5, kernel-PAE 2.6.18-128.1.10.el5, kernel-xen 2.6.18-128.1.10.el5, kernel-kdump 2.6.18-128.1.10.el5, kernel-debuginfo-common 2.6.18-128.1.10.el5
    fixed: vendor fix RHSA-2009:0473
  • Red Hat Enterprise Linux AS version 4 kernel 2.6.9-78.0.22.EL, kernel-smp 2.6.9-78.0.22.EL, kernel-xenU 2.6.9-78.0.22.EL, kernel-hugemem 2.6.9-78.0.22.EL, kernel-largesmp 2.6.9-78.0.22.EL
    fixed: vendor fix RHSA-2009:0459
  • Red Hat Enterprise Linux Desktop (v. 5 client) kernel 2.6.18-128.1.10.el5, kernel-PAE 2.6.18-128.1.10.el5, kernel-xen 2.6.18-128.1.10.el5, kernel-kdump 2.6.18-128.1.10.el5, kernel-debuginfo-common 2.6.18-128.1.10.el5
    fixed: vendor fix RHSA-2009:0473
  • Red Hat Enterprise Linux Desktop version 4 kernel 2.6.9-78.0.22.EL, kernel-smp 2.6.9-78.0.22.EL, kernel-xenU 2.6.9-78.0.22.EL, kernel-hugemem 2.6.9-78.0.22.EL, kernel-largesmp 2.6.9-78.0.22.EL Red Hat Enterprise Linux ES version 4 kernel 2.6.9-78.0.22.EL, kernel-smp 2.6.9-78.0.22.EL, kernel-xenU 2.6.9-78.0.22.EL, kernel-hugemem 2.6.9-78.0.22.EL, kernel-largesmp 2.6.9-78.0.22.EL
    fixed: vendor fix RHSA-2009:0459
  • Red Hat Enterprise Linux EUS (v. 5.2 server) kernel 2.6.18-92.1.35.el5, kernel-PAE 2.6.18-92.1.35.el5, kernel-xen 2.6.18-92.1.35.el5, kernel-kdump 2.6.18-92.1.35.el5, kernel-debuginfo-common 2.6.18-92.1.35.el5
    fixed: vendor fix RHSA-2010:0079
  • Red Hat Enterprise Linux WS version 4 kernel 2.6.9-78.0.22.EL, kernel-smp 2.6.9-78.0.22.EL, kernel-xenU 2.6.9-78.0.22.EL, kernel-hugemem 2.6.9-78.0.22.EL, kernel-largesmp 2.6.9-78.0.22.EL
    fixed: vendor fix RHSA-2009:0459

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

0.44% chance of exploitation in the next 30 days, higher than 38% of all scored CVEs (FIRST EPSS, 2026-11-08).

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

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.