iommu/amd: serialize sequence allocation under concurrent TLB invalidations

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2026-43220
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-06 12:16:41 UTC
Updated2026-05-06 13:07:51 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
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 f2f65b28d802a667119147444ec2ae33eebf9a58 git Not specified
CNA Linux Linux affected 715c263119fd1b918a9fcbd8a36ea5b604a46324 git Not specified
CNA Linux Linux Not specified Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/9e249c48412828e807afddc21527eb734dc9bd3d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/48caa7542a795c9679ec1bd1bc2592e05a7369a4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5000ce7fcb31067566a1a1a2e5b5bbff93625242 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
© CVE.report 2026 |

Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. It is the responsibility of user to evaluate the accuracy, completeness or usefulness of any information, opinion, advice or other content. EACH USER WILL BE SOLELY RESPONSIBLE FOR ANY consequences of his or her direct or indirect use of this web site. ALL WARRANTIES OF ANY KIND ARE EXPRESSLY DISCLAIMED. This site will NOT BE LIABLE FOR ANY DIRECT, INDIRECT or any other kind of loss.

CVE, CWE, and OVAL are registred trademarks of The MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. This site includes MITRE data granted under the following license.

Free CVE JSON API cve.report/api

CVE.report and Source URL Uptime Status status.cve.report