CVE-2026-43305
AMD Display Driver DMUB Lock Mismatch Vulnerability
Publication date: 2026-05-08
Last updated on: 2026-05-08
Assigner: kernel.org
Description
Description
CVSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| linux | kernel | * |
| linux | linux_kernel | * |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-UNKNOWN |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability exists in the Linux kernel within the drm/amd/display component. It involves a mismatched unlock operation for the DMUB hardware lock in the HWSS fast path. Specifically, the condition used to decide whether to use the DMUB hardware lock is different from the condition used to decide whether to unlock it. This mismatch can cause the system to hang when the fast path is used on ASICs that do not support FAMS.
The fix involves storing a flag that indicates whether the lock should be used and then using that same flag to determine if unlocking is necessary, ensuring consistency and preventing the hang.
How can this vulnerability impact me? :
This vulnerability can cause the system to hang when the fast path is used on certain AMD hardware (ASICs without FAMS support). A system hang can lead to denial of service, interrupting normal operations and potentially requiring a reboot to recover.