Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2026-43220

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
06/05/2026
Last modified:
17/05/2026

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> iommu/amd: serialize sequence allocation under concurrent TLB invalidations<br /> <br /> With concurrent TLB invalidations, completion wait randomly gets timed out<br /> because cmd_sem_val was incremented outside the IOMMU spinlock, allowing<br /> CMD_COMPL_WAIT commands to be queued out of sequence and breaking the<br /> ordering assumption in wait_on_sem().<br /> Move the cmd_sem_val increment under iommu-&gt;lock so completion sequence<br /> allocation is serialized with command queuing.<br /> And remove the unnecessary return.

Impact

Vector 3.x
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 5.50 MEDIUM
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x
5.50
Severity 3.x
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.6.128 (including) 6.7 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.12.75 (including) 6.13 (excluding)

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools