CVE-2026-68429 is a vulnerability in Linux Kernel
Published on August 12, 2026
drm/dp_mst: Handle torn-down topology gracefully in drm_dp_mst_topology_queue_probe()
In the Linux kernel, the following vulnerability has been resolved:
drm/dp_mst: Handle torn-down topology gracefully in drm_dp_mst_topology_queue_probe()
A hotplug or link-loss event can tear down the MST topology
(setting mgr->mst_state = false and mgr->mst_primary = NULL) concurrently
with a caller invoking drm_dp_mst_topology_queue_probe(). Since the check
is already performed under mgr->lock, the condition is not a programming
error but a valid race -- the topology was valid when the caller decided
to call this function, but was torn down before the lock was acquired.
Replace the drm_WARN_ON() with a graceful early return. This eliminates
spurious kernel warnings and the resulting compositor crashes observed
when connecting/disconnecting DP MST monitors, while keeping the correct
behavior of doing nothing when MST is not active. A drm_dbg_mst() trace
is added so the skipped probe remains observable under MST debug logging.
The existing WARN_ON(mgr->mst_primary) in drm_dp_mst_topology_mgr_set_mst()
already catches the case where the topology is initialized twice, so no
diagnostic coverage is lost.
Products Associated with CVE-2026-68429
Want to know whenever a new CVE is published for Linux Kernel? stack.watch will email you.
Affected Versions
Linux:- Version 5f57a96e92c60f62da91d58ceb5e5acd40e7d594 and below b1d05cc61dfa6c4bd5e67855bec6a03e955f512d is affected.
- Version dbaeef363ea54f4c18112874b77503c72ba60fec and below 4ed6d08c4a59ee6a8cb806347f6d9873de5d229e is affected.
- Version dbaeef363ea54f4c18112874b77503c72ba60fec and below 8c6d84a54823cd839e6ce22af559925f1320c310 is affected.
- Version dbaeef363ea54f4c18112874b77503c72ba60fec and below afdff9103818656627920c21822e48a6dae2906f is affected.
- Version dbaeef363ea54f4c18112874b77503c72ba60fec and below 613059875958e7b217b250ed14c3b189f9488421 is affected.
- Version 6.6.86 and below 6.6.148 is affected.
- Version 6.12 is affected.
- Before 6.12 is unaffected.
- Version 6.6.148, <= 6.6.* is unaffected.
- Version 6.12.101, <= 6.12.* is unaffected.
- Version 6.18.42, <= 6.18.* is unaffected.
- Version 7.1.6, <= 7.1.* is unaffected.
- Version 7.2-rc2, <= * is unaffected.