Riskcovery

CVE-2026-43220

iommu/amd: serialize sequence allocation under concurrent TLB invalidations

State
Published
Severity
Not scored
Published
May 6, 2026
Updated
Oct 30, 2026
Reserved
May 1, 2026

Read the record on cve.org

Description

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • f2f65b28d802a667119147444ec2ae33eebf9a58 to before d51bf43193b1e95dc4e34e540dc76e19def2ae5aAffected
  • 715c263119fd1b918a9fcbd8a36ea5b604a46324 to before fca7aa0264ae99e5ff287d0ced5af0b82b121c4fAffected
  • e15768e68820142077bbca402d8e902f64ade1b0 to before 5000ce7fcb31067566a1a1a2e5b5bbff93625242Affected
  • 496269d12072ecb219826485bdbec70c92a8eef5 to before 48caa7542a795c9679ec1bd1bc2592e05a7369a4Affected
  • d2a0cac10597068567d336e85fa3cbdbe8ca62bf to before 9e249c48412828e807afddc21527eb734dc9bd3dAffected
  • 69d9339c02eddfc2a345be7220651068a3684383Affected
  • 6.1.191 to before 6.2Affected
LinuxLinux
  • 6.6.128 to before 6.6.140Affected
  • 6.12.75 to before 6.12.88Affected

References

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