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Vulnerability record · CVE-2026-43253 · published 6 May 2026

CVE-2026-43253: Linux kernel vulnerability

Linux · Linux Kernel

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.

7.5 CVSS 3.1 High EPSS 0.49% · top 60.6% CWE-667 · CWE-667
7.5CVSS 3.1 base score
0.49%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/496269d12072ecb219826485bdbec70c92a8eef5 Patch
https://git.kernel.org/stable/c/715c263119fd1b918a9fcbd8a36ea5b604a46324 Patch
https://git.kernel.org/stable/c/d2a0cac10597068567d336e85fa3cbdbe8ca62bf Patch
https://git.kernel.org/stable/c/e15768e68820142077bbca402d8e902f64ade1b0 Patch
https://git.kernel.org/stable/c/f2f65b28d802a667119147444ec2ae33eebf9a58 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-43253), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.