{"cve":"CVE-2025-40058","nvd":{"published":"2025-10-28T12:15:40.150","modified":"2026-10-19T21:10:00.160","status":"Deferred","description":"In the Linux kernel, the following vulnerability has been resolved:\n\niommu/vt-d: Disallow dirty tracking if incoherent page walk\n\nDirty page tracking relies on the IOMMU atomically updating the dirty bit\nin the paging-structure entry. For this operation to succeed, the paging-\nstructure memory must be coherent between the IOMMU and the CPU. In\nanother word, if the iommu page walk is incoherent, dirty page tracking\ndoesn't work.\n\nThe Intel VT-d specification, Section 3.10 \"Snoop Behavior\" states:\n\n\"Remapping hardware encountering the need to atomically update A/EA/D bits\n in a paging-structure entry that is not snooped will result in a non-\n recoverable fault.\"\n\nTo prevent an IOMMU from being incorrectly configured for dirty page\ntracking when it is operating in an incoherent mode, mark SSADS as\nsupported only when both ecap_slads and ecap_smpwc are supported.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","score":8.8},"cwes":[],"references":["https://git.kernel.org/stable/c/57f55048e564dedd8a4546d018e29d6bbfff0a7e","https://git.kernel.org/stable/c/8d096ce0e87bdc361f0b25d7943543bc53aa0b9e","https://git.kernel.org/stable/c/ebe16d245a00626bb87163862a1b07daf5475a3e"],"products":[],"source":"nvd","synced_at":"2026-10-21T03:43:09.190223697+00:00"},"epss":{"cve":"CVE-2025-40058","score":0.00163,"percentile":0.05493,"date":"2026-10-26"},"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."]}