Riskcovery

CVE-2025-40058

iommu/vt-d: Disallow dirty tracking if incoherent page walk

State
Published
Severity
8.8 High
Published
Oct 28, 2025
Updated
Aug 5, 2026
Reserved
Apr 16, 2025

Read the record on cve.org

Description

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.

Scores

CVSSScoreVectorSource
3.18.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:HLinux

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • f35f22cc760eb2c7034bf53251399685d611e03f to before ebe16d245a00626bb87163862a1b07daf5475a3eAffected
  • f35f22cc760eb2c7034bf53251399685d611e03f to before 8d096ce0e87bdc361f0b25d7943543bc53aa0b9eAffected
  • f35f22cc760eb2c7034bf53251399685d611e03f to before 57f55048e564dedd8a4546d018e29d6bbfff0a7eAffected
LinuxLinux
  • 6.7Affected
  • before 6.7Not affected
  • 6.12.53 through 6.12.*Not affected
  • 6.17.3 through 6.17.*Not affected
  • 6.18 and laterNot affected

References

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