CVE-2026-43220
Published: May 9, 2026Last modified: June 2, 2026
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.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 5.5 |
| Attack Vector | LOCAL |
| Attack complexity | LOW |
| Privileges required | LOW |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | NONE |
| Integrity impact | NONE |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | linux-lts | Not affected (6.1.33-r0) |
| 25 LTS | linux-lts | Fixed (6.12.92-r0) | |
| Stream | linux-lts | Fixed (6.12.92-r0) |
References
- https://git.kernel.org/stable/c/48caa7542a795c9679ec1bd1bc2592e05a7369a4
- https://git.kernel.org/stable/c/5000ce7fcb31067566a1a1a2e5b5bbff93625242
- https://git.kernel.org/stable/c/9e249c48412828e807afddc21527eb734dc9bd3d
- https://git.kernel.org/stable/c/d51bf43193b1e95dc4e34e540dc76e19def2ae5a
- https://git.kernel.org/stable/c/fca7aa0264ae99e5ff287d0ced5af0b82b121c4f