{"api_version":"1","generated_at":"2026-05-12T23:15:50+00:00","cve":"CVE-2026-43253","urls":{"html":"https://cve.report/CVE-2026-43253","api":"https://cve.report/api/cve/CVE-2026-43253.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-43253","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-43253"},"summary":{"title":"iommu/amd: move wait_on_sem() out of spinlock","description":"In the Linux kernel, the following vulnerability has been resolved:\n\niommu/amd: move wait_on_sem() out of spinlock\n\nWith iommu.strict=1, the existing completion wait path can cause soft\nlockups under stressed environment, as wait_on_sem() busy-waits under the\nspinlock with interrupts disabled.\n\nMove the completion wait in iommu_completion_wait() out of the spinlock.\nwait_on_sem() only polls the hardware-updated cmd_sem and does not require\niommu->lock, so holding the lock during the busy wait unnecessarily\nincreases contention and extends the time with interrupts disabled.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-06 12:16:46","updated_at":"2026-05-11 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move wait_on_sem() out of spinlock","CVE":"CVE-2026-43253","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"43253","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\niommu/amd: move wait_on_sem() out of spinlock\n\nWith iommu.strict=1, the existing completion wait path can cause soft\nlockups under stressed environment, as wait_on_sem() busy-waits under the\nspinlock with interrupts disabled.\n\nMove the completion wait in iommu_completion_wait() out of the spinlock.\nwait_on_sem() only polls the hardware-updated cmd_sem and does not require\niommu->lock, so holding the lock during the busy wait unnecessarily\nincreases contention and extends the time with interrupts disabled.","Type":"Description","Title":"iommu/amd: move wait_on_sem() out of spinlock"}]}}}