---
id: CVE-2026-98997
title: 'drm/amdgpu/userq: only accept doorbell BOs as queue doorbell'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  drm/amdgpu/userq: only accept doorbell BOs as queue doorbell

  amdgpu_userq_get_doorbell_index() pins any BO passed as doorbell_handle
  into the doorbell domain. For a re…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= f09c1e6077abd1bc2ddd2b97e1135215801ca7f9 <
    112dbe2b10d6d088a6c599980dd960dcbfa55ff0
  - >-
    Linux >= f09c1e6077abd1bc2ddd2b97e1135215801ca7f9 <
    8640b3f961d743d6dc0458c2b53a3af434690cc1
  - >-
    Linux >= f09c1e6077abd1bc2ddd2b97e1135215801ca7f9 <
    7f7c88dbf4d543f6703e53bdeed380e886733167
  - Linux 6.16
published: '2026-10-23'
updated: '2026-10-23'
sourceUpdated: '2026-10-23T12:20:16.267Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-98997'
references:
  - url: 'https://git.kernel.org/stable/c/112dbe2b10d6d088a6c599980dd960dcbfa55ff0'
  - url: 'https://git.kernel.org/stable/c/8640b3f961d743d6dc0458c2b53a3af434690cc1'
  - url: 'https://git.kernel.org/stable/c/7f7c88dbf4d543f6703e53bdeed380e886733167'
tags:
  - cve.org
ingestedAt: '2026-10-23T13:24:55.543Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

drm/amdgpu/userq: only accept doorbell BOs as queue doorbell

amdgpu_userq_get_doorbell_index() pins any BO passed as doorbell_handle
into the doorbell domain. For a regular BO, TTM moves it with
ttm_bo_move_null() and its contents are lost. Since an importer on the
same device gets the exporter's GEM object, a client can do this to a
buffer another client shared with it.

Reject BOs that were not created in the doorbell domain.

v2: drop the error message, use a local abo variable (Christian)

(cherry picked from commit f7497bbc19db4821c62b9d97b31c9086feb2d917)

## Affected

- `Linux >= f09c1e6077abd1bc2ddd2b97e1135215801ca7f9 < 112dbe2b10d6d088a6c599980dd960dcbfa55ff0`
- `Linux >= f09c1e6077abd1bc2ddd2b97e1135215801ca7f9 < 8640b3f961d743d6dc0458c2b53a3af434690cc1`
- `Linux >= f09c1e6077abd1bc2ddd2b97e1135215801ca7f9 < 7f7c88dbf4d543f6703e53bdeed380e886733167`
- `Linux 6.16`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.