CVE-2026-80909

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)