CVE-2024-26686

Local hard lockup via procfs statistics contention

Published Apr 3, 2024 · Updated May 11, 2026

Resource contention in do_task_stat in Linux allows local users to trigger a hard lockup through concurrent procfs statistics reads. The function holds siglock with interrupts disabled while aggregating thread and child statistics, so simultaneous reads scale as O(NR_CPUS * NR_THREADS). The trigger requires local low-privileged access, many concurrent readers, and a process with many threads; the result is an availability-only system stall.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource contention in do_task_stat in Linux allows local users to trigger a hard lockup through concurrent procfs statistics reads. The function holds siglock with interrupts disabled while aggregating thread and child statistics, so simultaneous reads scale as O(NR_CPUS * NR_THREADS). The trigger requires local low-privileged access, many concurrent readers, and a process with many threads; the result is an availability-only system stall.

The record

CVE
CVE-2024-26686
Published
Apr 3, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 3, 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0c35d1914353799c54fa1843fe7dea6fcbcdbac5
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <27978243f165b44e342f28f449b91327944ea071
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3820b0fac7732a653bcc6f6ac20c1d72e697f8f6
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4fe85bdaabd63f8f8579b24a10ed597c9c482164
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7601df8031fd67310af891897ef6cc0df4209305
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cf4b8c39b9a0bd81c47afc7ef62914a62dd5ec4d
  7. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0c35d1914353799c54fa1843fe7dea6fcbcdbac5; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <27978243f165b44e342f28f449b91327944ea071; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3820b0fac7732a653bcc6f6ac20c1d72e697f8f6; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4fe85bdaabd63f8f8579b24a10ed597c9c482164; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7601df8031fd67310af891897ef6cc0df4209305; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cf4b8c39b9a0bd81c47afc7ef62914a62dd5ec4d; version=2.6.12

Published CVSS scores

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

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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

T1499.004Endpoint Denial of Service: Application or System Exploitation

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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