CVE-2026-74638

GPU hang via concurrent timeout-handler credit corruption

Published Aug 22, 2026 · Updated Aug 25, 2026

Race condition in the Linux kernel V3D driver allows local users to hang the GPU and freeze the UI during concurrent queue timeouts. The CSD and CL timeout handlers run concurrently around a global reset, so pending-list removal and reinsertion make stop and start account for different jobs and permanently skew the scheduler credit count. The flaw requires local low-privileged access and V3D workloads that produce overlapping queue timeouts; the resulting impact is a complete GPU hang and UI freeze.

CVSS severity5.5
Medium
EPSS probability0.17%
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 V3D driver allows local users to hang the GPU and freeze the UI during concurrent queue timeouts. The CSD and CL timeout handlers run concurrently around a global reset, so pending-list removal and reinsertion make stop and start account for different jobs and permanently skew the scheduler credit count. The flaw requires local low-privileged access and V3D workloads that produce overlapping queue timeouts; the resulting impact is a complete GPU hang and UI freeze.

The record

CVE
CVE-2026-74638
Published
Aug 22, 2026
Updated
Aug 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-367, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 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=12125f7d9c15e6d8ac91d10373b2db2f17dcf767
  2. Affected versionversion=35e4079bf1a2570abffce6ababa631afcf8ea0e5 <4da94744707b27a3ae1197bdd7127da4505dc5b1
  3. Affected versionversion=35e4079bf1a2570abffce6ababa631afcf8ea0e5 <5884851a096d8afcdf91f0e542bac193035183a6
  4. Affected versionversion=35e4079bf1a2570abffce6ababa631afcf8ea0e5 <c22a45817b9c92aa0391db60e2ed467c7e6027d7
  5. Affected versionversion=422a8b10ba42097a704d6909ada2956f880246f2
  6. Affected versionversion=5235b56b7e5449d990d21d78723b1a5e7bb5738e
  7. Affected versionversion=6.1.139 <6.2
  8. Affected versionversion=6.12.29 <6.13
  9. Affected versionversion=6.14.7 <6.15
  10. Affected versionversion=6.15
  11. Affected versionversion=6.6.91 <6.7
  12. Affected versionversion=a5f162727b91e480656da1876247a91f651f76de

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=12125f7d9c15e6d8ac91d10373b2db2f17dcf767; version=35e4079bf1a2570abffce6ababa631afcf8ea0e5 <4da94744707b27a3ae1197bdd7127da4505dc5b1; version=35e4079bf1a2570abffce6ababa631afcf8ea0e5 <5884851a096d8afcdf91f0e542bac193035183a6; version=35e4079bf1a2570abffce6ababa631afcf8ea0e5 <c22a45817b9c92aa0391db60e2ed467c7e6027d7; version=422a8b10ba42097a704d6909ada2956f880246f2; version=5235b56b7e5449d990d21d78723b1a5e7bb5738e; version=6.1.139 <6.2; version=6.12.29 <6.13; version=6.14.7 <6.15; version=6.15; version=6.6.91 <6.7; version=a5f162727b91e480656da1876247a91f651f76de

Published CVSS scores

5.5Red HatCVSS: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 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

CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition
T1499.004Application 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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