Read the docs
TI-2011-03987 Aliases CVE-2011-4621GHSA-pm23-x64q-p9f3

The Linux kernel before 2.6.37 does not properly implement a certain clock-update…

Priority LOW 25CWE-835Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-835.

Summary

The Linux kernel before 2.6.37 does not properly implement a certain clock-update optimization, which allows local users to cause a denial of service (system hang) via an application that executes code in a loop.

Why it matters now

EPSS 0.00441 38th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed Red Hat: 1 advisory

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*before 2.6.37VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions before 2.6.37 Vulnerable ·Linux

Remediation

Red Hat 1 advisory

  • RHSA-2011:1849 Released 2011-12-22 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat Enterprise Linux Desktop (v. 6) kernel-2.6.32-220.2.1.el6, kernel-debug-2.6.32-220.2.1.el6, kernel-debug-devel-2.6.32-220.2.1.el6 +5
    • Red Hat Enterprise Linux Desktop Optional (v. 6) kernel-2.6.32-220.2.1.el6, python-perf-2.6.32-220.2.1.el6
    • Red Hat Enterprise Linux HPC Node (v. 6) kernel-2.6.32-220.2.1.el6, kernel-debug-2.6.32-220.2.1.el6, kernel-debug-devel-2.6.32-220.2.1.el6 +5
    • Red Hat Enterprise Linux HPC Node Optional (v. 6) kernel-2.6.32-220.2.1.el6, python-perf-2.6.32-220.2.1.el6
    • Red Hat Enterprise Linux Server (v. 6) kernel-2.6.32-220.2.1.el6, kernel-bootwrapper-2.6.32-220.2.1.el6, kernel-debug-2.6.32-220.2.1.el6 +8
    • Red Hat Enterprise Linux Server Optional (v. 6) kernel-2.6.32-220.2.1.el6, python-perf-2.6.32-220.2.1.el6
    • Red Hat Enterprise Linux Workstation (v. 6) kernel-2.6.32-220.2.1.el6, kernel-debug-2.6.32-220.2.1.el6, kernel-debug-devel-2.6.32-220.2.1.el6 +5
    • Red Hat Enterprise Linux Workstation Optional (v. 6) kernel-2.6.32-220.2.1.el6, python-perf-2.6.32-220.2.1.el6

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux Desktop (v. 6)Fixed RHSA-2011:1849
Red Hat Enterprise Linux Desktop Optional (v. 6)Fixed RHSA-2011:1849
Red Hat Enterprise Linux HPC Node (v. 6)Fixed RHSA-2011:1849
Red Hat Enterprise Linux HPC Node Optional (v. 6)Fixed RHSA-2011:1849
Red Hat Enterprise Linux Server (v. 6)Fixed RHSA-2011:1849
Red Hat Enterprise Linux Server Optional (v. 6)Fixed RHSA-2011:1849
Red Hat Enterprise Linux Workstation (v. 6)Fixed RHSA-2011:1849
Red Hat Enterprise Linux Workstation Optional (v. 6)Fixed RHSA-2011:1849
Not affected: 3 products
  • Red Hat Enterprise Linux 4
  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise MRG 2

Timeline

  1. 2026-10-02 Threatist record created from CVE-2011-4621
  2. 2026-10-03 Alias added: GHSA-pm23-x64q-p9f3

References

Exploit 1

Patch 2

Other 2

  • TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
  • TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
  • TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
  • TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
  • TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
See all 15278 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences