CVE-2024-49976

Local system hang via timerlat lock inversion

Published Oct 21, 2024 · Updated May 23, 2026

Improper locking in Linux kernel timerlat CPU-hotplug handling allows local users to hang the system during CPU offlining. stop_kthread() acquires interface_lock while the hotplug path holds the CPU write lock, while osnoise_hotplug_workfn() takes the same locks in reverse order, creating an ABBA deadlock. Exploitation requires low-privileged local access and concurrent timerlat and CPU-hotplug activity; the documented consequence is an availability-only system hang.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in Linux kernel timerlat CPU-hotplug handling allows local users to hang the system during CPU offlining. stop_kthread() acquires interface_lock while the hotplug path holds the CPU write lock, while osnoise_hotplug_workfn() takes the same locks in reverse order, creating an ABBA deadlock. Exploitation requires low-privileged local access and concurrent timerlat and CPU-hotplug activity; the documented consequence is an availability-only system hang.

The record

CVE
CVE-2024-49976
Published
Oct 21, 2024
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 21, 2024CVE publishedPublication date reported by the CVE source.
  2. May 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4679272d5252720746fd9c5465352cbc5665f230 <09cb44cc3d3df7ade2cebc939d6257a2fa8afc7a
  2. Affected versionversion=5bfbcd1ee57b607fd29e4645c7f350dd385dd9ad <b484a02c9cedf8703eff8f0756f94618004bd165
  3. Affected versionversion=5bfbcd1ee57b607fd29e4645c7f350dd385dd9ad <db8571a9a098086608c11a15856ff585789e67e8
  4. Affected versionversion=6.10.10 <6.10.14
  5. Affected versionversion=6.11
  6. Affected versionversion=6.6.51 <6.6.55
  7. Affected versionversion=b4fdabffae14cca2c80d99bd81f3f27239ac7f5e <a4a05ceffe8fad68b45de38fe2311bda619e76e2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4679272d5252720746fd9c5465352cbc5665f230 <09cb44cc3d3df7ade2cebc939d6257a2fa8afc7a; version=5bfbcd1ee57b607fd29e4645c7f350dd385dd9ad <b484a02c9cedf8703eff8f0756f94618004bd165; version=5bfbcd1ee57b607fd29e4645c7f350dd385dd9ad <db8571a9a098086608c11a15856ff585789e67e8; version=6.10.10 <6.10.14; version=6.11; version=6.6.51 <6.6.55; version=b4fdabffae14cca2c80d99bd81f3f27239ac7f5e <a4a05ceffe8fad68b45de38fe2311bda619e76e2

Published CVSS scores

5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-667Improper Locking
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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