CVE-2026-43253

Last refreshed2026-10-17

Status: UPDATED | Advisory ID: CVE-2026-43253

Key Details

CVE	CVE-2026-43253
CVSS Score / Version	7.5 (High) / CVSS v3.1
Updated	2026-10-16
CVSS Vector	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`
CVSS Prose	attack vector is network; attack complexity is low; privileges required is none; user interaction is none; scope is unchanged; confidentiality impact is none; integrity impact is none; availability impact is high.
Affected products	Linux Kernel
Classified as	CWE-667 (Improper Locking)

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

In the Linux kernel, the following vulnerability has been resolved:

iommu/amd: move wait_on_sem() out of spinlock

With iommu.strict=1, the existing completion wait path can cause soft

lockups under stressed environment, as wait_on_sem() busy-waits under the

spinlock with interrupts disabled.

Move the completion wait in iommu_completion_wait() out of the spinlock.

wait_on_sem() only polls the hardware-updated cmd_sem and does not require

iommu->lock, so holding the lock during the busy wait unnecessarily

increases contention and extends the time with interrupts disabled. (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-43253
CVE	https://www.cve.org/CVERecord?id=CVE-2026-43253

Source

Reference

NVD

CVE