CVEvulnerability
CVE-2026-43220
5.5 MEDIUM
Official page ↗
- Status
- Modified
- Published
- 2026-05-06
- Last modified
- 2026-06-17
- Assigner
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
- CVSS 3.1 ([email protected])
- 5.5 MEDIUM — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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.
Affected configurations
• linux linux kernel (>= 6.6.128 < 6.7)
• linux linux kernel (>= 6.12.75 < 6.13)
References
- https://git.kernel.org/stable/c/48caa7542a795c9679ec1bd1bc2592e05a7369a4 Patch
- https://git.kernel.org/stable/c/5000ce7fcb31067566a1a1a2e5b5bbff93625242 Patch
- https://git.kernel.org/stable/c/9e249c48412828e807afddc21527eb734dc9bd3d Patch
- https://git.kernel.org/stable/c/d51bf43193b1e95dc4e34e540dc76e19def2ae5a git.kernel.org
- https://git.kernel.org/stable/c/fca7aa0264ae99e5ff287d0ced5af0b82b121c4f git.kernel.org