CVE-2026-68364
Received Received - Intake

Deadlock in AMD Display Driver During Suspend

Publication date: 2026-08-10

Last updated on: 2026-08-10

Assigner: kernel.org

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.

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Meta Information

Published
2026-08-10
Last Modified
2026-08-10
Generated
2026-08-10
AI Q&A
2026-08-10
EPSS Evaluated
N/A
NVD
CVE-2026-68364
EUVD
EUVD-2026-55465

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
amd linux_kernel *

Helpful Resources

Exploitability

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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability in the Linux kernel involves a deadlock in the AMD display driver during system suspend/resume. When video is playing, the system may hang because a function called amdgpu_dm_ism_disable() holds a lock and waits for a delayed work item to finish, while the work item itself tries to acquire the same lock.

Detection Guidance

This vulnerability is specific to the Linux kernel's AMD display driver and manifests as a system hang during suspend/resume with video playback. Detection requires checking kernel logs for suspend/resume hangs or system freezes during video operations. Monitor dmesg or journalctl for amdgpu/drm errors.

Impact Analysis

This vulnerability can cause your system to freeze or hang during suspend or resume operations, especially when video is playing. This may lead to data loss or require a hard reboot.

Mitigation Strategies

Update the Linux kernel to a patched version that includes the fix for CVE-2026-68364. The patch splits the disable path into two phases to prevent the ABBA deadlock. Check your distribution's security updates or compile a kernel with the fix applied.

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