CVE-2026-31566

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)

Affected Software

VendorProductVersion RangeStatus
LinuxLinux9ae55f030dc523fc4dc6069557e4a887ea815453 < bc7760c107dc08ef3e231d72c492e67b0a86848baffected
LinuxLinux9ae55f030dc523fc4dc6069557e4a887ea815453 < e23602eb0779760544314ed3905fa6a89a4e4070affected
LinuxLinux9ae55f030dc523fc4dc6069557e4a887ea815453 < 138e42be35ff2ce6572ae744de851ea286cf3c69affected
LinuxLinux9ae55f030dc523fc4dc6069557e4a887ea815453 < 39820864eacd886f1a6f817414fb8f9ea3e9a2b4affected
LinuxLinux9ae55f030dc523fc4dc6069557e4a887ea815453 < 42d248726a0837640452b71c5a202ca3d35239ecaffected
LinuxLinux9ae55f030dc523fc4dc6069557e4a887ea815453 < 7150850146ebfa4ca998f653f264b8df6f7f85beaffected
LinuxLinux6.0affected
LinuxLinux0 < 6.0unaffected
LinuxLinux6.1.168 <= 6.1.*unaffected
LinuxLinux6.6.131 <= 6.6.*unaffected
LinuxLinux6.12.80 <= 6.12.*unaffected
LinuxLinux6.18.21 <= 6.18.*unaffected
LinuxLinux6.19.11 <= 6.19.*unaffected
LinuxLinux7.0 <= *unaffected

Weaknesses

References