drm/amdgpu: Fix fence put before wait in amdgpu_amdkfd_submit_ib

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Summary

CVECVE-2026-31566
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-24 15:16:31 UTC
Updated2026-04-27 20:32:14 UTC
DescriptionIn 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)

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.000240000 probability, percentile 0.067850000 (date 2026-04-27)

Problem Types: CWE-416

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 9ae55f030dc523fc4dc6069557e4a887ea815453 bc7760c107dc08ef3e231d72c492e67b0a86848b git Not specified
CNA Linux Linux affected 9ae55f030dc523fc4dc6069557e4a887ea815453 e23602eb0779760544314ed3905fa6a89a4e4070 git Not specified
CNA Linux Linux affected 9ae55f030dc523fc4dc6069557e4a887ea815453 138e42be35ff2ce6572ae744de851ea286cf3c69 git Not specified
CNA Linux Linux affected 9ae55f030dc523fc4dc6069557e4a887ea815453 39820864eacd886f1a6f817414fb8f9ea3e9a2b4 git Not specified
CNA Linux Linux affected 9ae55f030dc523fc4dc6069557e4a887ea815453 42d248726a0837640452b71c5a202ca3d35239ec git Not specified
CNA Linux Linux affected 9ae55f030dc523fc4dc6069557e4a887ea815453 7150850146ebfa4ca998f653f264b8df6f7f85be git Not specified
CNA Linux Linux affected 6.0 Not specified
CNA Linux Linux unaffected 6.0 semver Not specified
CNA Linux Linux unaffected 6.1.168 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.131 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.80 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.21 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.11 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/7150850146ebfa4ca998f653f264b8df6f7f85be 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/e23602eb0779760544314ed3905fa6a89a4e4070 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/42d248726a0837640452b71c5a202ca3d35239ec 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/39820864eacd886f1a6f817414fb8f9ea3e9a2b4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/bc7760c107dc08ef3e231d72c492e67b0a86848b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/138e42be35ff2ce6572ae744de851ea286cf3c69 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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