CVE-2026-31766

Description

In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: validate doorbell_offset in user queue creation amdgpu_userq_get_doorbell_index() passes the user-provided doorbell_offset to amdgpu_doorbell_index_on_bar() without bounds checking. An arbitrarily large doorbell_offset can cause the calculated doorbell index to fall outside the allocated doorbell BO, potentially corrupting kernel doorbell space. Validate that doorbell_offset falls within the doorbell BO before computing the BAR index, using u64 arithmetic to prevent overflow. (cherry picked from commit de1ef4ffd70e1d15f0bf584fd22b1f28cbd5e2ec)

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

References

• https://git.kernel.org/stable/c/3543005a42d7e8e12b21897ef6798541bf7cbcd3 ↗
• https://git.kernel.org/stable/c/86b732fbc37ce4fb76cdd4af0fb7e30a6acdbce6 ↗
• https://git.kernel.org/stable/c/a018d1819f158991b7308e4f74609c6c029b670c ↗