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Fencer Intel
low 3.6

CVE-2011-1021 json

drivers/acpi/debugfs.c in the Linux kernel before 3.0 allows local users to modify arbitrary kernel memory locations by leveraging root pri…

published 2012-06-21 14 y ago modified 2026-06-16 4 mo ago also EUVD-2011-1038

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

drivers/acpi/debugfs.c in the Linux kernel before 3.0 allows local users to modify arbitrary kernel memory locations by leveraging root privileges to write to the /sys/kernel/debug/acpi/custom_method file. NOTE: this vulnerability exists because of an incomplete fix for CVE-2010-4347.

Patch / fix

  • kernel-rt enterprise mrg 2 2.6.33.9-rt31.75.el6rt
  • kernel-rt-trace enterprise mrg 2 2.6.33.9-rt31.75.el6rt
  • kernel-rt-vanilla enterprise mrg 2 2.6.33.9-rt31.75.el6rt
  • kernel-rt-firmware enterprise mrg 2 2.6.33.9-rt31.75.el6rt
  • kernel-rt-debuginfo-common-x86_64 enterprise mrg 2 2.6.33.9-rt31.75.el6rt

red hat advisories RHSA-2011:1253

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-2011-1021 updated cvss 6.0

kernel: /sys/kernel/debug/acpi/custom_method can bypass module restrictions

  • Red Hat MRG Realtime for RHEL 6 Server v.2 kernel-rt 2.6.33.9-rt31.75.el6rt, kernel-rt-trace 2.6.33.9-rt31.75.el6rt, kernel-rt-vanilla 2.6.33.9-rt31.75.el6rt, kernel-rt-firmware 2.6.33.9-rt31.75.el6rt, kernel-rt-debuginfo-common-x86_64 2.6.33.9-rt31.75.el6rt
    fixed: vendor fix RHSA-2011:1253
  • Red Hat Enterprise Linux 4 kernel Red Hat Enterprise Linux 5 kernel Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more
    not affected: vulnerable code not present

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-15774)
  2. Published

Exploit prediction

0.93% chance of exploitation in the next 30 days, higher than 60% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • EDB-15774 Linux Kernel < 2.6.37-rc2 - 'ACPI custom_method' Local Privilege Escalation local, 2010-12-18
  • github.com https://github.com/torvalds/linux/commit/526b4af47f44148c9d665e57723ed9f86634c6e3 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:N/I:P/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.