CVE-2026-43220
MEDIUM EPSS 2.8%
Published May 6, 20261mo ago · Modified Jun 17, 20262w ago
5.5 CVSS 3.1
Published May 6, 2026 1mo ago
Last Modified Jun 17, 2026 2w ago
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 Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High
Threat Intelligence
EPSS Exploit Probability
2.8% percentile
Exploit & Patch Status
No Known Exploit
Patch Available
Affected Products 2
References 5
- git.kernel.org https://git.kernel.org/stable/c/48caa7542a795c9679ec1bd1bc2592e05a7369a4
- git.kernel.org https://git.kernel.org/stable/c/5000ce7fcb31067566a1a1a2e5b5bbff93625242
- git.kernel.org https://git.kernel.org/stable/c/9e249c48412828e807afddc21527eb734dc9bd3d
- git.kernel.org https://git.kernel.org/stable/c/d51bf43193b1e95dc4e34e540dc76e19def2ae5a
- git.kernel.org https://git.kernel.org/stable/c/fca7aa0264ae99e5ff287d0ced5af0b82b121c4f
Remediation
- git.kernel.org https://git.kernel.org/stable/c/48caa7542a795c9679ec1bd1bc2592e05a7369a4
- git.kernel.org https://git.kernel.org/stable/c/5000ce7fcb31067566a1a1a2e5b5bbff93625242
- git.kernel.org https://git.kernel.org/stable/c/9e249c48412828e807afddc21527eb734dc9bd3d