{"cve":"CVE-2026-43253","nvd":{"published":"2026-05-06T12:16:46.033","modified":"2026-10-19T20:18:12.423","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-667","CWE-833"],"references":["https://git.kernel.org/stable/c/496269d12072ecb219826485bdbec70c92a8eef5","https://git.kernel.org/stable/c/715c263119fd1b918a9fcbd8a36ea5b604a46324","https://git.kernel.org/stable/c/d2a0cac10597068567d336e85fa3cbdbe8ca62bf","https://git.kernel.org/stable/c/e15768e68820142077bbca402d8e902f64ade1b0","https://git.kernel.org/stable/c/f2f65b28d802a667119147444ec2ae33eebf9a58"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-21T03:43:09.190223697+00:00"},"epss":{"cve":"CVE-2026-43253","score":0.0034,"percentile":0.27226,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}