High 7.5Published May 6, 2026

CVE-2026-43253iommu/amd: move wait_on_sem() out of spinlock

Updated under an hour ago (Oct 27, 2026, 10:23 AM ET)

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Exploited in the last 30 days

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: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-833
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 4bf5beef578e46393f11eb69dda7d17a065e05ff before f2f65b28d802a667119147444ec2ae33eebf9a58; from 4bf5beef578e46393f11eb69dda7d17a065e05ff before 715c263119fd1b918a9fcbd8a36ea5b604a46324; from 4bf5beef578e46393f11eb69dda7d17a065e05ff before e15768e68820142077bbca402d8e902f64ade1b0; from 4bf5beef578e46393f11eb69dda7d17a065e05ff before 496269d12072ecb219826485bdbec70c92a8eef5; from 4bf5beef578e46393f11eb69dda7d17a065e05ff before d2a0cac10597068567d336e85fa3cbdbe8ca62bf	CNA record
linux linux_kernel linux:linux_kernel	from 4.9 before 6.6.128; from 6.7 before 6.12.75; from 6.13 before 6.18.16; from 6.19 before 6.19.6	NVD

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.