KVM: x86/mmu: Check write tracking in all address spaces
In the Linux kernel, the following vulnerability has been resolved: KVM: x86/mmu: Check write tracking in all address spaces kvm_gfn_is_write_tracked() checks only the supplied memslot, but page tracking is per-address-space and shadow pages are shared across all address spaces. With SMM, a GFN can therefore be write-tracked in one address space and appear untracked through the other. Check the supplied slot first, then the slot for the other address space. This ensures all callers honor write tracking regardless of the active address space. In particular, it prevents mmu_try_to_unsync_pages() from marking an upper-level shadow page unsync and eventually triggering the BUG in pte_list_remove(). [invert direction of the conditional. - Paolo]
CVE-2026-98164
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-98164
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "699023e239658e62da6f42f47d31b54788521ec1",
"lessThan": "09aa68552d2542cc6c23edd1568ac265dc5d886f",
"versionType": "git"
},
{
"status": "affected",
"version": "699023e239658e62da6f42f47d31b54788521ec1",
"lessThan": "429b6f43b4d8c98988fdca99e02dc156134e3d77",
"versionType": "git"
},
{
"status": "affected",
"version": "699023e239658e62da6f42f47d31b54788521ec1",
"lessThan": "d8636c8f9f95d0fd1e2f6f1cad0d5757aa6f212a",
"versionType": "git"
},
{
"status": "affected",
"version": "699023e239658e62da6f42f47d31b54788521ec1",
"lessThan": "c0a9bd5fca0b5f2dea32b0fc31350e71e8648112",
"versionType": "git"
},
{
"status": "affected",
"version": "699023e239658e62da6f42f47d31b54788521ec1",
"lessThan": "ec8fcaf354c1cbb36755d48e9f5a00c9591349e5",
"versionType": "git"
},
{
"status": "affected",
"version": "699023e239658e62da6f42f47d31b54788521ec1",
"lessThan": "0f38453cdb2e17566ccb7c0f3dabd5bd21caca26",
"versionType": "git"
}
],
"programFiles": [
"arch/x86/kvm/mmu/page_track.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.2"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.2",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.187",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.156",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.108",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.49",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.13",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"arch/x86/kvm/mmu/page_track.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98164
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #11762 · Revision 1
- Added to Heist Feed
- Publisher date