iommu/amd: serialize sequence allocation under concurrent TLB invalidations

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Summary

CVECVE-2026-43220
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-06 12:16:41 UTC
Updated2026-05-17 16:16:16 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: iommu/amd: serialize sequence allocation under concurrent TLB invalidations With concurrent TLB invalidations, completion wait randomly gets timed out because cmd_sem_val was incremented outside the IOMMU spinlock, allowing CMD_COMPL_WAIT commands to be queued out of sequence and breaking the ordering assumption in wait_on_sem(). Move the cmd_sem_val increment under iommu->lock so completion sequence allocation is serialized with command queuing. And remove the unnecessary return.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

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

Problem Types: NVD-CWE-noinfo

CVSS v3.1 Breakdown

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

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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 f2f65b28d802a667119147444ec2ae33eebf9a58 d51bf43193b1e95dc4e34e540dc76e19def2ae5a git Not specified
CNA Linux Linux affected 715c263119fd1b918a9fcbd8a36ea5b604a46324 fca7aa0264ae99e5ff287d0ced5af0b82b121c4f git Not specified
CNA Linux Linux affected e15768e68820142077bbca402d8e902f64ade1b0 5000ce7fcb31067566a1a1a2e5b5bbff93625242 git Not specified
CNA Linux Linux affected 496269d12072ecb219826485bdbec70c92a8eef5 48caa7542a795c9679ec1bd1bc2592e05a7369a4 git Not specified
CNA Linux Linux affected d2a0cac10597068567d336e85fa3cbdbe8ca62bf 9e249c48412828e807afddc21527eb734dc9bd3d git Not specified
CNA Linux Linux affected 6.6.128 6.6.140 semver Not specified
CNA Linux Linux affected 6.12.75 6.12.88 semver Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/d51bf43193b1e95dc4e34e540dc76e19def2ae5a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9e249c48412828e807afddc21527eb734dc9bd3d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/48caa7542a795c9679ec1bd1bc2592e05a7369a4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/fca7aa0264ae99e5ff287d0ced5af0b82b121c4f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5000ce7fcb31067566a1a1a2e5b5bbff93625242 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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