CVE-2026-43220
iommu/amd: serialize sequence allocation under concurrent TLB invalidations
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | May 6, 2026 |
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Affected Versions
Linux / Linux
e15768e68820142077bbca402d8e902f64ade1b0 < 5000ce7fcb31067566a1a1a2e5b5bbff93625242 496269d12072ecb219826485bdbec70c92a8eef5 < 48caa7542a795c9679ec1bd1bc2592e05a7369a4 d2a0cac10597068567d336e85fa3cbdbe8ca62bf < 9e249c48412828e807afddc21527eb734dc9bd3d f2f65b28d802a667119147444ec2ae33eebf9a58 715c263119fd1b918a9fcbd8a36ea5b604a46324
Linux / Linux
All versions affected