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.
GHSA-hwfw-95mf-c924
In the Linux kernel, the following vulnerability has been resolved:
iommu/vt-d: Disallow dirty...
https://github.com/advisories/GHSA-hwfw-95mf-c924In 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.
Click to expand
{
"dataType": "CVE_RECORD",
"dataVersion": "5.1",
"cveMetadata": {
"cveId": "CVE-2025-40058",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"dateUpdated": "2025-10-28T11:48:31.567Z",
"dateReserved": "2025-04-16T07:20:57.158Z",
"datePublished": "2025-10-28T11:48:31.567Z",
"state": "PUBLISHED"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2025-10-28T11:48:31.567Z"
},
"title": "iommu/vt-d: Disallow dirty tracking if incoherent page walk",
"descriptions": [
{
"lang": "en",
"value": "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."
}
],
"affected": [
{
"vendor": "Linux",
"product": "Linux",
"programFiles": [
"drivers/iommu/intel/iommu.h"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"defaultStatus": "unaffected",
"versions": [
{
"version": "f35f22cc760eb2c7034bf53251399685d611e03f",
"status": "affected",
"versionType": "git",
"lessThan": "ebe16d245a00626bb87163862a1b07daf5475a3e"
},
{
"version": "f35f22cc760eb2c7034bf53251399685d611e03f",
"status": "affected",
"versionType": "git",
"lessThan": "8d096ce0e87bdc361f0b25d7943543bc53aa0b9e"
},
{
"version": "f35f22cc760eb2c7034bf53251399685d611e03f",
"status": "affected",
"versionType": "git",
"lessThan": "57f55048e564dedd8a4546d018e29d6bbfff0a7e"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"programFiles": [
"drivers/iommu/intel/iommu.h"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"defaultStatus": "affected",
"versions": [
{
"version": "6.7",
"status": "affected"
},
{
"version": "0",
"status": "unaffected",
"versionType": "semver",
"lessThan": "6.7"
},
{
"version": "6.12.53",
"status": "unaffected",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"version": "6.17.3",
"status": "unaffected",
"versionType": "semver",
"lessThanOrEqual": "6.17.*"
},
{
"version": "6.18-rc1",
"status": "unaffected",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/ebe16d245a00626bb87163862a1b07daf5475a3e"
},
{
"url": "https://git.kernel.org/stable/c/8d096ce0e87bdc361f0b25d7943543bc53aa0b9e"
},
{
"url": "https://git.kernel.org/stable/c/57f55048e564dedd8a4546d018e29d6bbfff0a7e"
}
]
}
}
}