CVE-2026-31566 (GCVE-0-2026-31566)
Vulnerability from cvelistv5 – Published: 2026-04-24 14:35 – Updated: 2026-10-19 18:55
VLAI
EPSS
VEX
Title
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)
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 15:10 UTC
CWE
- CWE-416 - Use After Free
Assigner
References
6 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
9ae55f030dc523fc4dc6069557e4a887ea815453 , < bc7760c107dc08ef3e231d72c492e67b0a86848b
(git)
Affected: 9ae55f030dc523fc4dc6069557e4a887ea815453 , < e23602eb0779760544314ed3905fa6a89a4e4070 (git) Affected: 9ae55f030dc523fc4dc6069557e4a887ea815453 , < 138e42be35ff2ce6572ae744de851ea286cf3c69 (git) Affected: 9ae55f030dc523fc4dc6069557e4a887ea815453 , < 39820864eacd886f1a6f817414fb8f9ea3e9a2b4 (git) Affected: 9ae55f030dc523fc4dc6069557e4a887ea815453 , < 42d248726a0837640452b71c5a202ca3d35239ec (git) Affected: 9ae55f030dc523fc4dc6069557e4a887ea815453 , < 7150850146ebfa4ca998f653f264b8df6f7f85be (git) |
guessed | |
| Linux | Linux |
Affected:
6.0
Unaffected: 0 , < 6.0 (semver) Unaffected: 6.1.168 , ≤ 6.1.* (semver) Unaffected: 6.6.131 , ≤ 6.6.* (semver) Unaffected: 6.12.80 , ≤ 6.12.* (semver) Unaffected: 6.18.21 , ≤ 6.18.* (semver) Unaffected: 6.19.11 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix) |
guessed |
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"published": "2026-04-24T15:16:31.077",
"references": [
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"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Modified",
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"lang": "en",
"value": "CWE-416"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
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"value": "CWE-416"
}
],
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
]
}
},
"redhat_vex": {
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"current_release_date": "2026-09-24T09:56:24+00:00",
"cve": "CVE-2026-31566",
"id": "CVE-2026-31566",
"initial_release_date": "2026-04-24T00:00:00+00:00",
"product_status:fixed": "762",
"product_status:known_affected": "22",
"product_status:known_not_affected": "42",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: drm/amdgpu: Fix fence put before wait in amdgpu_amdkfd_submit_ib",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31566.json",
"version": "3"
},
"vulnrichment": {
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"metrics": [
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"other": {
"content": {
"id": "CVE-2026-31566",
"options": [
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"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-10-16T15:10:55.523185Z",
"version": "2.0.3"
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"description": "CWE-416 Use After Free",
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}
],
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
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],
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{
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"status": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"status": "unaffected",
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"version": "6.12.80",
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"status": "unaffected",
"version": "6.18.21",
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},
{
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"status": "unaffected",
"version": "6.19.11",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "7.0",
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"cpeApplicability": [
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"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 \u0027f\u0027 (line 696)\n\n(cherry picked from commit 8b9e5259adc385b61a6590a13b82ae0ac2bd3482)"
}
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"baseSeverity": "HIGH",
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"version": "3.1"
},
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{
"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."
}
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}
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},
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"url": "https://git.kernel.org/stable/c/138e42be35ff2ce6572ae744de851ea286cf3c69"
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},
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"url": "https://git.kernel.org/stable/c/7150850146ebfa4ca998f653f264b8df6f7f85be"
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"title": "drm/amdgpu: Fix fence put before wait in amdgpu_amdkfd_submit_ib",
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"assignerShortName": "Linux",
"cveId": "CVE-2026-31566",
"datePublished": "2026-04-24T14:35:46.740Z",
"dateReserved": "2026-03-09T15:48:24.117Z",
"dateUpdated": "2026-10-19T18:55:59.130Z",
"state": "PUBLISHED"
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}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.