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

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CVE-2026-43253

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
06/05/2026
Last modified:
08/05/2026

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> iommu/amd: move wait_on_sem() out of spinlock<br /> <br /> With iommu.strict=1, the existing completion wait path can cause soft<br /> lockups under stressed environment, as wait_on_sem() busy-waits under the<br /> spinlock with interrupts disabled.<br /> <br /> Move the completion wait in iommu_completion_wait() out of the spinlock.<br /> wait_on_sem() only polls the hardware-updated cmd_sem and does not require<br /> iommu-&gt;lock, so holding the lock during the busy wait unnecessarily<br /> increases contention and extends the time with interrupts disabled.

Impact

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

Base Score: 7.50 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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

Base Score 3.x
7.50
Severity 3.x
HIGH

References to Advisories, Solutions, and Tools