CVE-2026-68429 (GCVE-0-2026-68429)

Vulnerability from cvelistv5 – Published: 2026-08-12 00:07 – Updated: 2026-08-17 05:05
VLAI
Title
drm/dp_mst: Handle torn-down topology gracefully in drm_dp_mst_topology_queue_probe()
Summary
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
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5f57a96e92c60f62da91d58ceb5e5acd40e7d594 , < b1d05cc61dfa6c4bd5e67855bec6a03e955f512d (git)
Affected: dbaeef363ea54f4c18112874b77503c72ba60fec , < 4ed6d08c4a59ee6a8cb806347f6d9873de5d229e (git)
Affected: dbaeef363ea54f4c18112874b77503c72ba60fec , < 8c6d84a54823cd839e6ce22af559925f1320c310 (git)
Affected: dbaeef363ea54f4c18112874b77503c72ba60fec , < afdff9103818656627920c21822e48a6dae2906f (git)
Affected: dbaeef363ea54f4c18112874b77503c72ba60fec , < 613059875958e7b217b250ed14c3b189f9488421 (git)
Affected: 6.6.86 , < 6.6.148 (semver)
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Linux Linux Affected: 6.12
Unaffected: 0 , < 6.12 (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/dp_mst: Handle torn-down topology gracefully in drm_dp_mst_topology_queue_probe()\n\nA hotplug or link-loss event can tear down the MST topology\n(setting mgr-\u003emst_state = false and mgr-\u003emst_primary = NULL) concurrently\nwith a caller invoking drm_dp_mst_topology_queue_probe(). Since the check\nis already performed under mgr-\u003elock, the condition is not a programming\nerror but a valid race -- the topology was valid when the caller decided\nto call this function, but was torn down before the lock was acquired.\n\nReplace the drm_WARN_ON() with a graceful early return. This eliminates\nspurious kernel warnings and the resulting compositor crashes observed\nwhen connecting/disconnecting DP MST monitors, while keeping the correct\nbehavior of doing nothing when MST is not active. A drm_dbg_mst() trace\nis added so the skipped probe remains observable under MST debug logging.\n\nThe existing WARN_ON(mgr-\u003emst_primary) in drm_dp_mst_topology_mgr_set_mst()\nalready catches the case where the topology is initialized twice, so no\ndiagnostic coverage is lost."
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        "dateUpdated": "2026-08-17T05:05:25.387Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/afdff9103818656627920c21822e48a6dae2906f"
        },
        {
          "url": "https://git.kernel.org/stable/c/613059875958e7b217b250ed14c3b189f9488421"
        }
      ],
      "title": "drm/dp_mst: Handle torn-down topology gracefully in drm_dp_mst_topology_queue_probe()",
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    "cveId": "CVE-2026-68429",
    "datePublished": "2026-08-12T00:07:14.640Z",
    "dateReserved": "2026-07-30T09:28:09.393Z",
    "dateUpdated": "2026-08-17T05:05:25.387Z",
    "state": "PUBLISHED"
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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-12T17:28:33+00:00",
      "cve": "CVE-2026-68429",
      "id": "CVE-2026-68429",
      "initial_release_date": "2026-08-12T00:00:00+00:00",
      "product_status:known_affected": "183",
      "product_status:known_not_affected": "93",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drm/dp_mst: Handle torn-down topology gracefully in drm_dp_mst_topology_queue_probe()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68429.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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