Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 6.6.128, < 6.7 |
References
- https://git.kernel.org/stable/c/48caa7542a795c9679ec1bd1bc2592e05a7369a4Patch
- https://git.kernel.org/stable/c/5000ce7fcb31067566a1a1a2e5b5bbff93625242Patch
- https://git.kernel.org/stable/c/9e249c48412828e807afddc21527eb734dc9bd3dPatch
- https://git.kernel.org/stable/c/d51bf43193b1e95dc4e34e540dc76e19def2ae5a
- https://git.kernel.org/stable/c/fca7aa0264ae99e5ff287d0ced5af0b82b121c4f
FAQ
What is CVE-2026-43220?
CVE-2026-43220 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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 ran...
How severe is CVE-2026-43220?
CVE-2026-43220 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-43220?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.