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Fencer Intel
low 2.1

CVE-2011-4110 json

The user_update function in security/keys/user_defined.c in the Linux kernel 2.6 allows local users to cause a denial of service (NULL poin…

published 2012-01-27 14 y ago modified 2026-06-16 4 mo ago also EUVD-2011-4058

cvss
2.1
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 40%
public exploits
0
none known

Summary

The user_update function in security/keys/user_defined.c in the Linux kernel 2.6 allows local users to cause a denial of service (NULL pointer dereference and kernel oops) via vectors related to a user-defined key and "updating a negative key into a fully instantiated key."

Patch / fix

  • kernel RHEL 5 2.6.18-274.12.1.el5
  • kernel-PAE RHEL 5 2.6.18-274.12.1.el5
  • kernel-xen RHEL 5 2.6.18-274.12.1.el5
  • kernel-kdump RHEL 5 2.6.18-274.12.1.el5
  • kernel-debuginfo-common RHEL 5 2.6.18-274.12.1.el5
  • kernel-rt enterprise mrg 2 3.0.18-rt34.53.el6rt
  • kernel-rt-trace enterprise mrg 2 3.0.18-rt34.53.el6rt
  • kernel-rt-vanilla enterprise mrg 2 3.0.18-rt34.53.el6rt

red hat advisories RHSA-2011:1479RHSA-2012:0333RHSA-2012:0116RHSA-2012:0010RHSA-2011:1530

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-2011-4110 updated cvss 4.9

kernel: keys: NULL pointer deref in the user-defined key type

  • Red Hat Enterprise Linux 4 kernel
    affected: no fix available
  • Red Hat Enterprise Linux (v. 5 server) kernel 2.6.18-274.12.1.el5, kernel-PAE 2.6.18-274.12.1.el5, kernel-xen 2.6.18-274.12.1.el5, kernel-kdump 2.6.18-274.12.1.el5, kernel-debuginfo-common 2.6.18-274.12.1.el5 Red Hat Enterprise Linux Desktop (v. 5 client) kernel 2.6.18-274.12.1.el5, kernel-PAE 2.6.18-274.12.1.el5, kernel-xen 2.6.18-274.12.1.el5, kernel-debuginfo-common 2.6.18-274.12.1.el5
    fixed: vendor fix RHSA-2011:1479
  • Red Hat Enterprise Linux Desktop (v. 6) perf 2.6.32-220.el6, kernel 2.6.32-220.el6, kernel-firmware 2.6.32-220.el6, kernel-debuginfo-common-i686 2.6.32-220.el6, kernel-debuginfo-common-x86_64 2.6.32-220.el6 Red Hat Enterprise Linux Desktop Optional (v. 6) kernel 2.6.32-220.el6, python-perf 2.6.32-220.el6, kernel-debuginfo-common-i686 2.6.32-220.el6, kernel-debuginfo-common-x86_64 2.6.32-220.el6 Red Hat Enterprise Linux HPC Node (v. 6) perf 2.6.32-220.el6, kernel 2.6.32-220.el6, kernel-firmware 2.6.32-220.el6, kernel-debuginfo-common-x86_64 2.6.32-220.el6 Red Hat Enterprise Linux HPC Node Optional (v. 6) kernel 2.6.32-220.el6, python-perf 2.6.32-220.el6, kernel-debuginfo-common-x86_64 2.6.32-220.el6 Red Hat Enterprise Linux Server (v. 6) perf 2.6.32-220.el6, kernel 2.6.32-220.el6, kernel-kdump 2.6.32-220.el6, kernel-firmware 2.6.32-220.el6, kernel-bootwrapper 2.6.32-220.el6, kernel-debuginfo-common-i686 2.6.32-220.el6, +3 more
    fixed: vendor fix RHSA-2011:1530
  • Red Hat Enterprise Linux Server EUS (v. 6.1) perf 2.6.32-131.25.1.el6, kernel 2.6.32-131.25.1.el6, kernel-kdump 2.6.32-131.25.1.el6, kernel-firmware 2.6.32-131.25.1.el6, kernel-bootwrapper 2.6.32-131.25.1.el6, kernel-debuginfo-common-i686 2.6.32-131.25.1.el6, +3 more
    fixed: vendor fix RHSA-2012:0116
  • Red Hat Enterprise Linux Server Optional (v. 6) kernel 2.6.32-220.el6, python-perf 2.6.32-220.el6, kernel-debuginfo-common-i686 2.6.32-220.el6, kernel-debuginfo-common-ppc64 2.6.32-220.el6, kernel-debuginfo-common-s390x 2.6.32-220.el6, kernel-debuginfo-common-x86_64 2.6.32-220.el6 Red Hat Enterprise Linux Workstation (v. 6) perf 2.6.32-220.el6, kernel 2.6.32-220.el6, kernel-firmware 2.6.32-220.el6, kernel-debuginfo-common-i686 2.6.32-220.el6, kernel-debuginfo-common-x86_64 2.6.32-220.el6 Red Hat Enterprise Linux Workstation Optional (v. 6) kernel 2.6.32-220.el6, python-perf 2.6.32-220.el6, kernel-debuginfo-common-i686 2.6.32-220.el6, kernel-debuginfo-common-x86_64 2.6.32-220.el6
    fixed: vendor fix RHSA-2011:1530
  • Red Hat MRG Realtime for RHEL 6 Server v.2 kernel-rt 3.0.18-rt34.53.el6rt, kernel-rt 2.6.33.9-rt31.79.el6rt, kernel-rt-trace 3.0.18-rt34.53.el6rt, kernel-rt-trace 2.6.33.9-rt31.79.el6rt, kernel-rt-vanilla 3.0.18-rt34.53.el6rt, kernel-rt-firmware 3.0.18-rt34.53.el6rt, +4 more
    fixed: vendor fix RHSA-2012:0010

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

0.47% chance of exploitation in the next 30 days, higher than 40% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • lkml.org https://lkml.org/lkml/2011/11/15/363 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

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

Classification

Weakness
  • CWE-264 Permissions, Privileges, and Access Controls
Technology feeds

References

Sources

Fencer Intel 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.