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Vulnerability Details CVE-2026-43253

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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 18.2%
CVSS Severity
CVSS v3 Score 7.5
Products affected by CVE-2026-43253


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