CVE-2026-68429 - drm/dp_mst: Handle torn-down topology gracefully in drm_dp_mst_topology_queue_probe()

CVE-2026-68429 - drm/dp_mst: Handle torn-down topology gracefully in drm_dp_mst_topology_queue_probe()

https://cvefeed.io/rssfeed/latest.atom / Wed, 08/12/2026 - 04:25
CVE ID :CVE-2026-68429
Published : Aug. 12, 2026, 12:17 a.m. | 1 hour, 10 minutes ago
Description :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.
Severity: 0.0 | NA
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