CVE-2026-68429: drm/dp_mst: Handle torn-down topology gracefully in drm_dp_mst_topology_queue_probe()
drm/dpmst: Handle torn-down topology gracefully in drmdpmsttopologyqueueprobe()
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 6.6.150.1-1 - Configuration
In drm_dp_mst_topology_mgr_set_mst(), replace the existing WARN_ON(mgr->mst_primary) check with a graceful early return so torn-down MST topology is handled without spurious kernel warnings and compositor crashes.
Linux kernel DRM DP MST Replace drm_WARN_ON() with a graceful early return = enabled (graceful return instead of WARN_ON) - Configuration
In drm_dp_mst_topology_queue_probe(), add handling for torn-down MST topology so that if the topology was valid when the caller decided but tore down before acquiring mgr->lock, the probe is skipped gracefully while remaining observable under MST debug logging.
Linux kernel DRM DP MST drm_dp_mst_topology_queue_probe probe handling = skip probe with MST debug visibility (under torn-down topology race)
Event History
Frequently Asked Questions
What is the severity of CVE-2026-68429?
CVE-2026-68429 has a risk rating of 23, indicating it poses a significant security threat.
How do I fix CVE-2026-68429?
To fix CVE-2026-68429, update the Linux kernel to the latest version that includes the patch for this vulnerability.
What type of vulnerability is CVE-2026-68429?
CVE-2026-68429 is related to the handling of torn-down display topology in the Linux kernel's DRM subsystem.
Who is affected by CVE-2026-68429?
Users of affected versions of the Linux kernel that utilize DisplayPort MST technology may be impacted by CVE-2026-68429.
When was CVE-2026-68429 published?
CVE-2026-68429 was published on August 12, 2026.