CVE-2024-49866

System crash via timerlat CPU-hotplug race

Published Oct 21, 2024 · Updated Aug 5, 2026

Race condition in the Linux kernel timerlat tracer allows local users to crash the system during concurrent CPU hotplug. osnoise_hotplug_workfn queues online processing asynchronously, then start_kthread can target a CPU already removed from cpu_online_mask and corrupt the active hrtimer. Reaching the race requires local access to tracing and CPU-hotplug controls; the documented consequence is a kernel warning, panic, or hang.

CVSS severity7.8
High
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

Race condition in the Linux kernel timerlat tracer allows local users to crash the system during concurrent CPU hotplug. osnoise_hotplug_workfn queues online processing asynchronously, then start_kthread can target a CPU already removed from cpu_online_mask and corrupt the active hrtimer. Reaching the race requires local access to tracing and CPU-hotplug controls; the documented consequence is a kernel warning, panic, or hang.

The record

CVE
CVE-2024-49866
Published
Oct 21, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 21, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=5.14
  2. Affected versionversion=c8895e271f7994a3ecb13b8a280e39aa53879545 <322920b53dc11f9c2b33397eb3ae5bc6a175b60d
  3. Affected versionversion=c8895e271f7994a3ecb13b8a280e39aa53879545 <829e0c9f0855f26b3ae830d17b24aec103f7e915
  4. Affected versionversion=c8895e271f7994a3ecb13b8a280e39aa53879545 <a0d9c0cd5856191e095cf43a2e141b73945b7716
  5. Affected versionversion=c8895e271f7994a3ecb13b8a280e39aa53879545 <a6e9849063a6c8f4cb2f652a437e44e3ed24356c
  6. Affected versionversion=c8895e271f7994a3ecb13b8a280e39aa53879545 <ce25f33ba89d6eefef64157655d318444580fa14
  7. Affected versionversion=c8895e271f7994a3ecb13b8a280e39aa53879545 <f72b451dc75578f644a3019c1489e9ae2c14e6c4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.14; version=c8895e271f7994a3ecb13b8a280e39aa53879545 <322920b53dc11f9c2b33397eb3ae5bc6a175b60d; version=c8895e271f7994a3ecb13b8a280e39aa53879545 <829e0c9f0855f26b3ae830d17b24aec103f7e915; version=c8895e271f7994a3ecb13b8a280e39aa53879545 <a0d9c0cd5856191e095cf43a2e141b73945b7716; version=c8895e271f7994a3ecb13b8a280e39aa53879545 <a6e9849063a6c8f4cb2f652a437e44e3ed24356c; version=c8895e271f7994a3ecb13b8a280e39aa53879545 <ce25f33ba89d6eefef64157655d318444580fa14; version=c8895e271f7994a3ecb13b8a280e39aa53879545 <f72b451dc75578f644a3019c1489e9ae2c14e6c4

Published CVSS scores

7.8Linux Kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.7CanonicalCVSS:3.1/AV:L/AC:H/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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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