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Fencer Vulns
low 2.1

CVE-2009-2910 json

arch/x86/ia32/ia32entry.S in the Linux kernel before 2.6.31.4 on the x86_64 platform does not clear certain kernel registers before a retur…

published 2009-10-20 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-2898

cvss
2.1
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 36%
public exploits
0
none known

Summary

arch/x86/ia32/ia32entry.S in the Linux kernel before 2.6.31.4 on the x86_64 platform does not clear certain kernel registers before a return to user mode, which allows local users to read register values from an earlier process by switching an ia32 process to 64-bit mode.

Patch / fix

  • linux linux_kernel 2.6.31.4
  • kernel RHEL 5 2.6.18-164.11.1.el5
  • kernel-PAE RHEL 5 2.6.18-164.11.1.el5
  • kernel-xen RHEL 5 2.6.18-164.11.1.el5
  • kernel-kdump RHEL 5 2.6.18-164.11.1.el5
  • kernel-debuginfo-common RHEL 5 2.6.18-164.11.1.el5
  • kernel RHEL 4 2.6.9-89.0.18.EL
  • kernel-smp RHEL 4 2.6.9-89.0.18.EL
  • kernel-xenU RHEL 4 2.6.9-89.0.18.EL

red hat advisories RHSA-2010:0046RHSA-2009:1671RHSA-2009:1540

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-2009-2910 updated cvss 2.1

kernel: x86_64 32 bit process register leak

  • Red Hat MRG Realtime for RHEL 5 Server kernel-rt 2.6.24.7-137.el5rt, kernel-rt-trace 2.6.24.7-137.el5rt, kernel-rt-vanilla 2.6.24.7-137.el5rt, kernel-rt-debuginfo-common 2.6.24.7-137.el5rt
    fixed: vendor fix RHSA-2009:1540
  • Red Hat Enterprise Linux (v. 5 server) kernel 2.6.18-164.11.1.el5, kernel-PAE 2.6.18-164.11.1.el5, kernel-xen 2.6.18-164.11.1.el5, kernel-kdump 2.6.18-164.11.1.el5, kernel-debuginfo-common 2.6.18-164.11.1.el5
    fixed: vendor fix RHSA-2010:0046
  • Red Hat Enterprise Linux AS version 4 kernel 2.6.9-89.0.18.EL, kernel-smp 2.6.9-89.0.18.EL, kernel-xenU 2.6.9-89.0.18.EL, kernel-hugemem 2.6.9-89.0.18.EL, kernel-largesmp 2.6.9-89.0.18.EL
    fixed: vendor fix RHSA-2009:1671
  • Red Hat Enterprise Linux Desktop (v. 5 client) kernel 2.6.18-164.11.1.el5, kernel-PAE 2.6.18-164.11.1.el5, kernel-xen 2.6.18-164.11.1.el5, kernel-kdump 2.6.18-164.11.1.el5, kernel-debuginfo-common 2.6.18-164.11.1.el5
    fixed: vendor fix RHSA-2010:0046
  • Red Hat Enterprise Linux Desktop version 4 kernel 2.6.9-89.0.18.EL, kernel-smp 2.6.9-89.0.18.EL, kernel-xenU 2.6.9-89.0.18.EL, kernel-hugemem 2.6.9-89.0.18.EL, kernel-largesmp 2.6.9-89.0.18.EL Red Hat Enterprise Linux ES version 4 kernel 2.6.9-89.0.18.EL, kernel-smp 2.6.9-89.0.18.EL, kernel-xenU 2.6.9-89.0.18.EL, kernel-hugemem 2.6.9-89.0.18.EL, kernel-largesmp 2.6.9-89.0.18.EL Red Hat Enterprise Linux WS version 4 kernel 2.6.9-89.0.18.EL, kernel-smp 2.6.9-89.0.18.EL, kernel-xenU 2.6.9-89.0.18.EL, kernel-hugemem 2.6.9-89.0.18.EL, kernel-largesmp 2.6.9-89.0.18.EL
    fixed: vendor fix RHSA-2009:1671

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

0.41% chance of exploitation in the next 30 days, higher than 36% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 2.0 2.1 AV:L/AC:L/Au:N/C:P/I:N/A:N

Classification

Weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
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.