CVE-2026-68364 drm/amd/display: Fix ISM dc_lock deadlock during suspend
A deadlock in the AMD display driver during suspend can cause a system hang, requiring local access and active video playback to trigger.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-68364?
CVE-2026-68364 is a denial of service vulnerability in Linux, published on 10 Aug 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
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.
Which versions are affected by CVE-2026-68364?
How do I fix CVE-2026-68364?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-68364 being exploited?
There is no known exploitation of CVE-2026-68364 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-68364, GHSA-3rg2-hc7q-mw7h, UBUNTU-CVE-2026-68364.