VULNERABILITY INTELLIGENCE
CVE-2026-43253
CVSS score7.5 HIGH
EPSS probability0.37%
CISA KEVNot currently listed
Published2026-05-06
Last modified2026-10-30
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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.
Weakness classification
- nvd@nist.gov: CWE-667
- 134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-833