CVE-2026-68429

Compositor crash via DP MST teardown race

Published Aug 12, 2026 · Updated Aug 12, 2026

Race condition in affected Linux kernel versions allows local users to crash the display compositor during DP MST topology changes. The drm_dp_mst_topology_queue_probe() path reaches drm_WARN_ON() after teardown clears mst_state and mst_primary before the lock is acquired, treating a valid torn-down topology as an assertion failure. Exposure requires a system using DP MST daisy-chained displays and a concurrent hotplug or link-loss event; systems without DP MST displays are unaffected.

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 affected Linux kernel versions allows local users to crash the display compositor during DP MST topology changes. The drm_dp_mst_topology_queue_probe() path reaches drm_WARN_ON() after teardown clears mst_state and mst_primary before the lock is acquired, treating a valid torn-down topology as an assertion failure. Exposure requires a system using DP MST daisy-chained displays and a concurrent hotplug or link-loss event; systems without DP MST displays are unaffected.

The record

CVE
CVE-2026-68429
Published
Aug 12, 2026
Updated
Aug 12, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-367, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 12, 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=5f57a96e92c60f62da91d58ceb5e5acd40e7d594 <b1d05cc61dfa6c4bd5e67855bec6a03e955f512d
  2. Affected versionversion=6.12
  3. Affected versionversion=6.6.86 <6.6.148
  4. Affected versionversion=dbaeef363ea54f4c18112874b77503c72ba60fec <4ed6d08c4a59ee6a8cb806347f6d9873de5d229e
  5. Affected versionversion=dbaeef363ea54f4c18112874b77503c72ba60fec <613059875958e7b217b250ed14c3b189f9488421
  6. Affected versionversion=dbaeef363ea54f4c18112874b77503c72ba60fec <8c6d84a54823cd839e6ce22af559925f1320c310
  7. Affected versionversion=dbaeef363ea54f4c18112874b77503c72ba60fec <afdff9103818656627920c21822e48a6dae2906f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5f57a96e92c60f62da91d58ceb5e5acd40e7d594 <b1d05cc61dfa6c4bd5e67855bec6a03e955f512d; version=6.12; version=6.6.86 <6.6.148; version=dbaeef363ea54f4c18112874b77503c72ba60fec <4ed6d08c4a59ee6a8cb806347f6d9873de5d229e; version=dbaeef363ea54f4c18112874b77503c72ba60fec <613059875958e7b217b250ed14c3b189f9488421; version=dbaeef363ea54f4c18112874b77503c72ba60fec <8c6d84a54823cd839e6ce22af559925f1320c310; version=dbaeef363ea54f4c18112874b77503c72ba60fec <afdff9103818656627920c21822e48a6dae2906f

Published CVSS scores

5.5Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
2.5Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L

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
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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