CVE-2024-26841

Kernel service interruption via stale sibling map

Published Apr 17, 2024 · Updated May 11, 2026

Denial of service in the LoongArch SMP code in Linux allows local users to interrupt service when a nonboot CPU is offlined. The loongson_cpu_disable() path marks the CPU offline but fails to remove it from cpu_sibling_map, leaving stale SMT topology that drives the jump-label count below zero. The condition requires a LoongArch SMT system, CPU-hotplug support, local low-privileged access, and a nonboot CPU-offline event; no data access or modification is reported.

CVSS severity5.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the LoongArch SMP code in Linux allows local users to interrupt service when a nonboot CPU is offlined. The loongson_cpu_disable() path marks the CPU offline but fails to remove it from cpu_sibling_map, leaving stale SMT topology that drives the jump-label count below zero. The condition requires a LoongArch SMT system, CPU-hotplug support, local low-privileged access, and a nonboot CPU-offline event; no data access or modification is reported.

The record

CVE
CVE-2024-26841
Published
Apr 17, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-459, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 17, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=5.19
  2. Affected versionversion=fa96b57c149061f71a70bd6582d995f6424fbbf4 <0d862db64d26c2905ba1a6a8561466b215b664c2
  3. Affected versionversion=fa96b57c149061f71a70bd6582d995f6424fbbf4 <752cd08da320a667a833803a8fd6bb266114cce5
  4. Affected versionversion=fa96b57c149061f71a70bd6582d995f6424fbbf4 <b1ec3d6b86fdd057559a5908e6668279bf770e0e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.19; version=fa96b57c149061f71a70bd6582d995f6424fbbf4 <0d862db64d26c2905ba1a6a8561466b215b664c2; version=fa96b57c149061f71a70bd6582d995f6424fbbf4 <752cd08da320a667a833803a8fd6bb266114cce5; version=fa96b57c149061f71a70bd6582d995f6424fbbf4 <b1ec3d6b86fdd057559a5908e6668279bf770e0e

Published CVSS scores

5.5NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5CanonicalCVSS: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-459Incomplete Cleanup
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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