CVE-2026-31766
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Summary
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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | f09c1e6077abd1bc2ddd2b97e1135215801ca7f9 < 3543005a42d7e8e12b21897ef6798541bf7cbcd3 | affected |
| Linux | Linux | f09c1e6077abd1bc2ddd2b97e1135215801ca7f9 < 86b732fbc37ce4fb76cdd4af0fb7e30a6acdbce6 | affected |
| Linux | Linux | f09c1e6077abd1bc2ddd2b97e1135215801ca7f9 < a018d1819f158991b7308e4f74609c6c029b670c | affected |
| Linux | Linux | 6.16 | affected |
| Linux | Linux | 0 < 6.16 | unaffected |
| Linux | Linux | 6.18.22 <= 6.18.* | unaffected |
| Linux | Linux | 6.19.12 <= 6.19.* | unaffected |
| Linux | Linux | 7.0 <= * | unaffected |
Weaknesses
References
- https://git.kernel.org/stable/c/3543005a42d7e8e12b21897ef6798541bf7cbcd3
- https://git.kernel.org/stable/c/86b732fbc37ce4fb76cdd4af0fb7e30a6acdbce6
- https://git.kernel.org/stable/c/a018d1819f158991b7308e4f74609c6c029b670c
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