Live › vulnerability › CVE-2026-99148
Go to dashboardIn the Linux kernel's AMD GPU driver, closing one of two handles to a graphics buffer removes the eviction fence even while another handle and its GPU mappings remain in use. The buffer can then be evicted without suspending the user queues that still access it, which can lead to memory corruption or unintended GPU memory access.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-28 11:32 UTC. All times on this page are UTC.
Systems running a Linux kernel with the amdgpu driver and AMD GPU user queues (for example navi31 with SDMA user queues) where a buffer object is opened through more than one handle in the same file. Systems without AMD GPUs using amdgpu user queues can likely skip it; the sources do not say more than that.
No product ranges from the sources yet.
Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
In the Linux kernel, the following vulnerability has been resolved:
drm/amdgpu: keep the eviction fence until the last handle is closed
amdgpu_gem_object_close() detaches the user queue eviction fence from the BO before it checks bo_va->ref_count, so closing any handle of a BO removes the fence, even when the file still has another handle to the BO and the bo_va 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 (GEM_FLINK + GEM_OPEN) loses its eviction fence when the second handle is closed (traced attach/detach of the fence):
attach bo=ffff8c78a6c84c00 GEM_CLOSE 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 bo_va goes away, matching amdgpu_gem_object_open(), which attaches it only when the bo_va is created. With this the fence stays until the file is closed.
(cherry picked from commit 8387982f03d4026b7dc11b0b5e3118298eee4d6a)
This page as .md · .json · in your agent: get_signal("CVE-2026-99148")
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