# CVE-2026-68364: drm/amd/display: Fix ISM dc_lock deadlock during suspend

CVE-2026-68364 is fixed in linux on 1 platform by DEBIAN-CVE-2026-68364 (version 7.1.6-1), released August 11, 2026. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2026-68364
- Priority: Urgent
- CVSS: 9.8 (Critical)
- EPSS: 0.0016
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 10, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68364

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 7.1.6-1 | [DEBIAN-CVE-2026-68364](https://patchblox.com/security/data/fix/linux/debian-cve-2026-68364.md) | Aug 11, 2026 |

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Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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