DEBIAN-CVE-2026-99148: Debian/linux vulnerability

In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: keep the eviction fence until the last handle is closed amdgpugemobjectclose() detaches the user queue eviction fence from the BO before it checks bova->refcount, so closing any handle of a BO removes the fence, even when the file still has another handle to the BO and the bova with its GPU mappings stays. The BO can then be evicted without suspending the user queues of the file, which keep accessing it through mappings that are only marked for update. Seen on navi31 with a SDMA user queue: a BO opened twice in the same file (GEMFLINK + GEMOPEN) loses its eviction fence when the second handle is closed (traced attach/detach of the fence): attach bo=ffff8c78a6c84c00 GEMCLOSE handle=7 detach bo=ffff8c78a6c84c00 while handle 6 and the mapping are still in use. Only detach the fence when the last reference to the bova goes away, matching amdgpugemobjectopen(), which attaches it only when the bova is created. With this the fence stays until the file is closed. (cherry picked from commit 8387982f03d4026b7dc11b0b5e3118298eee4d6a)