# CVE-2026-31766: linux: In the Linux kernel, the following vulnerability has been resolved:  drm/amdgpu: validate doorbell_offset in user que...

CVE-2026-31766 is fixed in linux on 1 platform by DEBIAN-CVE-2026-31766 (version 6.19.12-1), released May 15, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-31766
- Priority: High
- CVSS: 7.1 (high)
- EPSS: 0.0012
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 1, 2026

## 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)

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 6.19.12-1 | [DEBIAN-CVE-2026-31766](https://patchblox.com/security/data/fix/linux/debian-cve-2026-31766.md) | May 15, 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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