CVE-2026-68364
In the Linux kernel, the following vulnerability has been resolved:
drm/amd/display: Fix ISM dc_lock deadlock during suspend
[Why]
System hang observed during suspend/resume while video is playing.
amdgpu_dm_ism_disable() is called under dc_lock and waits for ISM
delayed work via disable_delayed_work_sync(). The work handlers
themselves take dc_lock, producing an ABBA deadlock when a worker is
in flight at suspend time.
[How]
Split the disable path into two phases with opposite locking
contracts:
1. amdgpu_dm_ism_disable() -- quiesces workers, must NOT hold
dc_lock.
2. amdgpu_dm_ism_force_full_power() (new) -- drives the ISM FSM
back to FULL_POWER_RUNNING, must hold dc_lock.
CSIRTS triage
- What
- AMD display driver deadlocks during suspend due to improper dc_lock handling in ISM.
- Who is affected
- Systems with AMD Radeon GPUs using the amdgpu display driver.
- Urgency
- Critical severity (CVSS 9.8); deadlock during suspend impacts system stability and reliability.
- Action
- Update to a patched Linux kernel version addressing CVE-2026-68364.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.16% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 6% of all EPSS-scored CVEs.
Advisory coverage (2)
- criticalCVE-2026-68364: drm/amd/display: Fix ISM dc_lock deadlock during suspendmsrc · 2026-08-11
- unknownCVE-2026-68364: In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Fix ISM d…nvd · 2026-08-10
External references
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