Medium 5.5Published May 6, 2026

CVE-2026-43220iommu/amd: serialize sequence allocation under concurrent TLB invalidations

Updated under an hour ago (Oct 28, 2026, 12:30 PM ET)

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Exploited in the last 30 days

In 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.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: May 17, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from f2f65b28d802a667119147444ec2ae33eebf9a58 before d51bf43193b1e95dc4e34e540dc76e19def2ae5a; from 715c263119fd1b918a9fcbd8a36ea5b604a46324 before fca7aa0264ae99e5ff287d0ced5af0b82b121c4f; from e15768e68820142077bbca402d8e902f64ade1b0 before 5000ce7fcb31067566a1a1a2e5b5bbff93625242; 496269d12072ecb219826485bdbec70c92a8eef5 builds before 48caa7542a795c9679ec1bd1bc2592e05a7369a4; from d2a0cac10597068567d336e85fa3cbdbe8ca62bf before 9e249c48412828e807afddc21527eb734dc9bd3d	CNA record
linux linux_kernel linux:linux_kernel	from 6.6.128 before 6.7; from 6.12.75 before 6.13	NVD

References

References

https://git.kernel.org/stable/c/d51bf43193b1e95dc4e34e540dc76e19def2ae5a
https://git.kernel.org/stable/c/fca7aa0264ae99e5ff287d0ced5af0b82b121c4f
https://git.kernel.org/stable/c/5000ce7fcb31067566a1a1a2e5b5bbff93625242	patch
https://git.kernel.org/stable/c/48caa7542a795c9679ec1bd1bc2592e05a7369a4	patch
https://git.kernel.org/stable/c/9e249c48412828e807afddc21527eb734dc9bd3d	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.