CVE-2025-40058
- Published: 1761653740
- Last modified: 1761653740
CVE-2025-40058 — In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Disallow dirty tracking if incoherent page walk Dirty page tracking relies on the IOMMU atomically updating the dirty bit in the paging-structure entry. For this operation to succeed, the paging- structure memory must be coherent between the IOMMU and…
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In the Linux kernel, the following vulnerability has been resolved:
iommu/vt-d: Disallow dirty tracking if incoherent page walk
Dirty page tracking relies on the IOMMU atomically updating the dirty bit
in the paging-structure entry. For this operation to succeed, the paging-
structure memory must be coherent between the IOMMU and the CPU. In
another word, if the iommu page walk is incoherent, dirty page tracking
doesn’t work.
The Intel VT-d specification, Section 3.10 “Snoop Behavior” states:
“Remapping hardware encountering the need to atomically update A/EA/D bits
in a paging-structure entry that is not snooped will result in a non-
recoverable fault.”
To prevent an IOMMU from being incorrectly configured for dirty page
tracking when it is operating in an incoherent mode, mark SSADS as
supported only when both ecap_slads and ecap_smpwc are supported.
🧠 Explainer: What this vulnerability means
Summary: The issue in the product by the vendor (CWE: unspecified) may enable attacks.
Impact: Potential impact includes remote code execution, data theft, or denial of service.
Mitigation: Prioritize patching and consider temporary workarounds documented by the vendor.
No vendor/product data yet.
No explicit mitigation/advisory links found in references.