CVE-2026-43220

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 v3 5.5 MEDIUM

5.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
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
https://git.kernel.org/stable/c/fca7aa0264ae99e5ff287d0ced5af0b82b121c4f

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::

History

11 Nov 2026, 20:10

Type	Values Removed	Values Added
Summary		(es) En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta: iommu/amd: serializar la asignación de secuencia bajo invalidaciones concurrentes de TLB Con invalidaciones concurrentes de TLB, la espera de finalización se agota aleatoriamente porque cmd_sem_val fue incrementado fuera del spinlock de IOMMU, permitiendo que los comandos CMD_COMPL_WAIT se encolen fuera de secuencia y rompiendo la suposición de orden en wait_on_sem(). Mover el incremento de cmd_sem_val bajo iommu -> lock para que la asignación de secuencia de finalización sea serializada con el encolamiento de comandos. Y eliminar el retorno innecesario.

Information

Published : 2026-05-06 12:16

Updated : 2026-11-11 20:10

NVD link : CVE-2026-43220

Mitre link : CVE-2026-43220

CVE.ORG link : CVE-2026-43220

JSON object : View

Products Affected

linux

linux_kernel

CWE

NVD-CWE-noinfo

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