drm/amdgpu: Fix fence put before wait in amdgpu_amdkfd_submit_ib

Summary

In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: Fix fence put before wait in amdgpu_amdkfd_submit_ib amdgpu_amdkfd_submit_ib() submits a GPU job and gets a fence from amdgpu_ib_schedule(). This fence is used to wait for job completion. Currently, the code drops the fence reference using dma_fence_put() before calling dma_fence_wait(). If dma_fence_put() releases the last reference, the fence may be freed before dma_fence_wait() is called. This can lead to a use-after-free. Fix this by waiting on the fence first and releasing the reference only after dma_fence_wait() completes. Fixes the below: drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c:697 amdgpu_amdkfd_submit_ib() warn: passing freed memory 'f' (line 696) (cherry picked from commit 8b9e5259adc385b61a6590a13b82ae0ac2bd3482)

Timeline

1. Apr 24, 2026, 2:35 PM UTCCVE published
2. Oct 16, 2026, 3:10 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: total

3. Oct 19, 2026, 6:55 PM UTCRecord last updated

Affected versions

• Linux Linux

  From 9ae55f030dc523fc4dc6069557e4a887ea815453 · fixed in bc7760c107dc08ef3e231d72c492e67b0a86848b; From 9ae55f030dc523fc4dc6069557e4a887ea815453 · fixed in e23602eb0779760544314ed3905fa6a89a4e4070; From 9ae55f030dc523fc4dc6069557e4a887ea815453 · fixed in 138e42be35ff2ce6572ae744de851ea286cf3c69; From 9ae55f030dc523fc4dc6069557e4a887ea815453 · fixed in 39820864eacd886f1a6f817414fb8f9ea3e9a2b4; From 9ae55f030dc523fc4dc6069557e4a887ea815453 · fixed in 42d248726a0837640452b71c5a202ca3d35239ec; From 9ae55f030dc523fc4dc6069557e4a887ea815453 · fixed in 7150850146ebfa4ca998f653f264b8df6f7f85be

• Linux Linux

  6.0

• KernelLinux

  From 6.0.0 · fixed in 6.1.168; From 6.2.0 · fixed in 6.6.131; From 6.7.0 · fixed in 6.12.80; From 6.13.0 · fixed in 6.18.21; From 6.19.0 · fixed in 6.19.11

References 6