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Linux Distros Unpatched Vulnerability : CVE-2026-68429

🗓️ 12 Aug 2026 00:00:00Reported by TenableType 
nessus
 nessus
🔗 www.tenable.com👁 4 Views

Race condition in drm_dp_mst_topology_queue_probe causes null deref and compositor crashes when DP MST topology is torn down concurrently.

Related
Refs
Code
ReporterTitlePublishedViews
Family
attackerkb
ATTACKERKB
CVE-2026-68429
12 Aug 202600:07
attackerkb
cve
CVE
CVE-2026-68429
12 Aug 202600:07
cve
cvelist
Cvelist
CVE-2026-68429 drm/dp_mst: Handle torn-down topology gracefully in drm_dp_mst_topology_queue_probe()
12 Aug 202600:07
cvelist
debiancve
Debian CVE
CVE-2026-68429
12 Aug 202600:07
debiancve
euvd
EUVD
EUVD-2026-57037
12 Aug 202600:07
euvd
nvd
NVD
CVE-2026-68429
12 Aug 202600:17
nvd
osv
OSV
DEBIAN-CVE-2026-68429
12 Aug 202600:17
osv
osv
OSV
UBUNTU-CVE-2026-68429
13 Aug 202600:00
osv
redhatcve
RedhatCVE
CVE-2026-68429
12 Aug 202615:50
redhatcve
#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

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"The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied
patch available.

  - 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. (CVE-2026-68429)

Note that Nessus relies on the presence of the package as reported by the vendor.");
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          {"reference": "kernel-rt-debug-modules"},
          {"reference": "kernel-rt-debug-modules-core"},
          {"reference": "kernel-rt-debug-modules-extra"},
          {"reference": "kernel-rt-debug-modules-internal"},
          {"reference": "kernel-rt-debug-modules-partner"},
          {"reference": "kernel-rt-devel"},
          {"reference": "kernel-rt-devel-matched"},
          {"reference": "kernel-rt-kvm"},
          {"reference": "kernel-rt-modules"},
          {"reference": "kernel-rt-modules-core"},
          {"reference": "kernel-rt-modules-extra"},
          {"reference": "kernel-rt-modules-internal"},
          {"reference": "kernel-rt-modules-partner"},
          {"reference": "kernel-selftests-internal"},
          {"reference": "kernel-tools"},
          {"reference": "kernel-tools-libs"},
          {"reference": "kernel-tools-libs-devel"},
          {"reference": "kernel-uki-virt"},
          {"reference": "kernel-uki-virt-addons"},
          {"reference": "kernel-zfcpdump"},
          {"reference": "kernel-zfcpdump-core"},
          {"reference": "kernel-zfcpdump-devel"},
          {"reference": "kernel-zfcpdump-devel-matched"},
          {"reference": "kernel-zfcpdump-modules"},
          {"reference": "kernel-zfcpdump-modules-core"},
          {"reference": "kernel-zfcpdump-modules-extra"},
          {"reference": "kernel-zfcpdump-modules-internal"},
          {"reference": "kernel-zfcpdump-modules-partner"},
          {"reference": "libperf"},
          {"reference": "libperf-devel"},
          {"reference": "perf"},
          {"reference": "python3-perf"},
          {"reference": "rtla"},
          {"reference": "rv"}
        ]
      }
    ]
  }
};

var distro_constraints_values = linux_unpatched::get_distro_constraints(distro_constraints_arr:distro_constraints_array);
if (empty_or_null(distro_constraints_values)) audit(AUDIT_HOST_NOT, 'affected');

var third_party_support = get_kb_item('Host/OS/extended-third-party');
if (!empty_or_null(third_party_support)) {
    var third_party_vendors = distro_constraints_values['third_party'];
    if (!empty_or_null(third_party_vendors)) {
        var vendor;
        foreach vendor (third_party_vendors) {
            if (vendor == third_party_support) exit(0, 'A third party management patch is available for this vulnerability from ' + vendor + '.\n');
        }
    }
}

var report = linux_unpatched::check_unpatched_constraints(distro_constraints_values:distro_constraints_values);

if (!empty_or_null(report))
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : report
  );
  exit(0);
}
else
{
  audit(AUDIT_HOST_NOT, 'affected');
}

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