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.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity High

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Linux
  • Linux Kernel

No data.

No data.

References
Link Providers
https://git.kernel.org/stable/c/57f55048e564dedd8a4546d018e29d6bbfff0a7e cve-icon cve-icon
https://git.kernel.org/stable/c/8d096ce0e87bdc361f0b25d7943543bc53aa0b9e cve-icon cve-icon
https://git.kernel.org/stable/c/ebe16d245a00626bb87163862a1b07daf5475a3e cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2025102815-CVE-2025-40058-0eba@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-40058 cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-40058 cve-icon
History

Wed, 29 Oct 2025 11:00:00 +0000

Type Values Removed Values Added
First Time appeared Linux
Linux linux Kernel
Vendors & Products Linux
Linux linux Kernel

Wed, 29 Oct 2025 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 7.0, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'}

threat_severity

Moderate

Tue, 28 Oct 2025 12:00:00 +0000

Type Values Removed Values Added
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.
Title iommu/vt-d: Disallow dirty tracking if incoherent page walk
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2025-10-28T11:48:31.567Z

Updated: 2025-10-28T11:48:31.567Z

Reserved: 2025-04-16T07:20:57.158Z

Link: CVE-2025-40058

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2025-10-28T12:15:40.150

Modified: 2025-10-28T12:15:40.150

Link: CVE-2025-40058

cve-icon Redhat

Severity : Moderate

Publid Date: 2025-10-28T00:00:00Z

Links: CVE-2025-40058 - Bugzilla