{"id":"CVE-2026-31566","state":"PUBLISHED","title":"drm/amdgpu: Fix fence put before wait in amdgpu_amdkfd_submit_ib","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: Fix fence put before wait in amdgpu_amdkfd_submit_ib\n\namdgpu_amdkfd_submit_ib() submits a GPU job and gets a fence\nfrom amdgpu_ib_schedule(). This fence is used to wait for job\ncompletion.\n\nCurrently, the code drops the fence reference using dma_fence_put()\nbefore calling dma_fence_wait().\n\nIf dma_fence_put() releases the last reference, the fence may be\nfreed before dma_fence_wait() is called. This can lead to a\nuse-after-free.\n\nFix this by waiting on the fence first and releasing the reference\nonly after dma_fence_wait() completes.\n\nFixes the below:\ndrivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c:697 amdgpu_amdkfd_submit_ib() warn: passing freed memory 'f' (line 696)\n\n(cherry picked from commit 8b9e5259adc385b61a6590a13b82ae0ac2bd3482)","publishedAt":"2026-04-24T14:35:46.740Z","updatedAt":"2026-10-19T18:55:59.130Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"9ae55f030dc523fc4dc6069557e4a887ea815453","status":"affected","lessThan":"bc7760c107dc08ef3e231d72c492e67b0a86848b","versionType":"git"},{"version":"9ae55f030dc523fc4dc6069557e4a887ea815453","status":"affected","lessThan":"e23602eb0779760544314ed3905fa6a89a4e4070","versionType":"git"},{"version":"9ae55f030dc523fc4dc6069557e4a887ea815453","status":"affected","lessThan":"138e42be35ff2ce6572ae744de851ea286cf3c69","versionType":"git"},{"version":"9ae55f030dc523fc4dc6069557e4a887ea815453","status":"affected","lessThan":"39820864eacd886f1a6f817414fb8f9ea3e9a2b4","versionType":"git"},{"version":"9ae55f030dc523fc4dc6069557e4a887ea815453","status":"affected","lessThan":"42d248726a0837640452b71c5a202ca3d35239ec","versionType":"git"},{"version":"9ae55f030dc523fc4dc6069557e4a887ea815453","status":"affected","lessThan":"7150850146ebfa4ca998f653f264b8df6f7f85be","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.0","versionType":"semver"},{"version":"6.1.168","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.131","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.80","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.21","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.11","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c"]}],"references":["https://git.kernel.org/stable/c/bc7760c107dc08ef3e231d72c492e67b0a86848b","https://git.kernel.org/stable/c/e23602eb0779760544314ed3905fa6a89a4e4070","https://git.kernel.org/stable/c/138e42be35ff2ce6572ae744de851ea286cf3c69","https://git.kernel.org/stable/c/39820864eacd886f1a6f817414fb8f9ea3e9a2b4","https://git.kernel.org/stable/c/42d248726a0837640452b71c5a202ca3d35239ec","https://git.kernel.org/stable/c/7150850146ebfa4ca998f653f264b8df6f7f85be"],"weaknesses":["CWE-416"],"ingestedAt":"2026-10-29T20:11:40.391Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/31xxx/CVE-2026-31566.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-31566","state":"PUBLISHED","datePublished":"2026-04-24T14:35:46.740Z","dateUpdated":"2026-10-19T18:55:59.130Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-03-09T15:48:24.117Z"},"containers":{"cna":{"title":"drm/amdgpu: Fix fence put before wait in amdgpu_amdkfd_submit_ib","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: Fix fence put before wait in amdgpu_amdkfd_submit_ib\n\namdgpu_amdkfd_submit_ib() submits a GPU job and gets a fence\nfrom amdgpu_ib_schedule(). This fence is used to wait for job\ncompletion.\n\nCurrently, the code drops the fence reference using dma_fence_put()\nbefore calling dma_fence_wait().\n\nIf dma_fence_put() releases the last reference, the fence may be\nfreed before dma_fence_wait() is called. This can lead to a\nuse-after-free.\n\nFix this by waiting on the fence first and releasing the reference\nonly after dma_fence_wait() completes.\n\nFixes the below:\ndrivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c:697 amdgpu_amdkfd_submit_ib() warn: passing freed memory 'f' (line 696)\n\n(cherry picked from commit 8b9e5259adc385b61a6590a13b82ae0ac2bd3482)"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"9ae55f030dc523fc4dc6069557e4a887ea815453","status":"affected","lessThan":"bc7760c107dc08ef3e231d72c492e67b0a86848b","versionType":"git"},{"version":"9ae55f030dc523fc4dc6069557e4a887ea815453","status":"affected","lessThan":"e23602eb0779760544314ed3905fa6a89a4e4070","versionType":"git"},{"version":"9ae55f030dc523fc4dc6069557e4a887ea815453","status":"affected","lessThan":"138e42be35ff2ce6572ae744de851ea286cf3c69","versionType":"git"},{"version":"9ae55f030dc523fc4dc6069557e4a887ea815453","status":"affected","lessThan":"39820864eacd886f1a6f817414fb8f9ea3e9a2b4","versionType":"git"},{"version":"9ae55f030dc523fc4dc6069557e4a887ea815453","status":"affected","lessThan":"42d248726a0837640452b71c5a202ca3d35239ec","versionType":"git"},{"version":"9ae55f030dc523fc4dc6069557e4a887ea815453","status":"affected","lessThan":"7150850146ebfa4ca998f653f264b8df6f7f85be","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.0","versionType":"semver"},{"version":"6.1.168","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.131","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.80","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.21","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.11","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/bc7760c107dc08ef3e231d72c492e67b0a86848b"},{"url":"https://git.kernel.org/stable/c/e23602eb0779760544314ed3905fa6a89a4e4070"},{"url":"https://git.kernel.org/stable/c/138e42be35ff2ce6572ae744de851ea286cf3c69"},{"url":"https://git.kernel.org/stable/c/39820864eacd886f1a6f817414fb8f9ea3e9a2b4"},{"url":"https://git.kernel.org/stable/c/42d248726a0837640452b71c5a202ca3d35239ec"},{"url":"https://git.kernel.org/stable/c/7150850146ebfa4ca998f653f264b8df6f7f85be"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The vulnerable `amdgpu_amdkfd_submit_ib()` path is reached from local userspace through `/dev/kfd` and AMDGPU/KFD queue ioctls, not through network, adjacent, or physical input.\nAC:L - On an affected AMDGPU KFD/NO_HWS Hawaii deployment, an attacker can drive the queue create/destroy path and repeatedly trigger the fence lifetime bug without relying on victim-controlled timing. When uncertain, the lower-complexity option is appropriate.\nPR:L - The path requires local access to the KFD/AMDGPU device interfaces and a render/DRM VM FD, but no kernel administrative capability is checked by the relevant KFD queue ioctls. This is ordinary low-privileged local GPU access rather than real root.\nUI:N - After obtaining local device access, the attacker can issue the ioctl sequence themselves. No separate victim action is required.\nS:U - The impact is within the same kernel security authority: corrupting or crashing kernel/driver state from a local kernel attack surface. It does not cross a VM, IOMMU, or comparable security boundary.\nC:H - The bug is a use-after-free of a `dma_fence`/AMDGPU fence object used by `dma_fence_wait()`. Per kernel scoring guidance, UAF memory corruption can be leveraged for high confidentiality impact.\nI:H - The same UAF exposes kernel object lifetime corruption in a wait path using function pointers, locks, callbacks, and list state. Per guidance, UAF memory corruption is scored as high integrity impact.\nA:H - Even without full exploitation, using a freed fence in `dma_fence_wait()` can cause kernel warnings, crashes, hangs, or panics. A kernel UAF therefore has high availability impact."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-05T12:23:32.865Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.1.168"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.6.131"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.12.80"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.18.21"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.19.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"7.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-31566","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:10:55.523185Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-416","lang":"en","type":"CWE","description":"CWE-416 Use After Free"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T18:55:59.130Z"}}]}}}