CVE-2026-98164
KVM: x86/mmu: Check write tracking in all address spaces
- Published
- Updated
- Reserved
- Assigned by
- Linux
Description
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]
Timeline
ID reserved
By Linux
- 4 days later
· 4 days later
Published
- 8 days later
· 8 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.1 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H |
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.15% · top 96% of all CVEs (7 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.1.
Weakness
Affected products
- affected 699023e239658e62da6f42f47d31b54788521ec1 – < 09aa68552d2542cc6c23edd1568ac265dc5d886f
- affected 699023e239658e62da6f42f47d31b54788521ec1 – < 429b6f43b4d8c98988fdca99e02dc156134e3d77
- affected 699023e239658e62da6f42f47d31b54788521ec1 – < d8636c8f9f95d0fd1e2f6f1cad0d5757aa6f212a
- affected 699023e239658e62da6f42f47d31b54788521ec1 – < c0a9bd5fca0b5f2dea32b0fc31350e71e8648112
- affected 699023e239658e62da6f42f47d31b54788521ec1 – < ec8fcaf354c1cbb36755d48e9f5a00c9591349e5
- affected 699023e239658e62da6f42f47d31b54788521ec1 – < 0f38453cdb2e17566ccb7c0f3dabd5bd21caca26
- affected 4.2
- unaffected < 4.2
- unaffected 6.1.187 – ≤ 6.1.*
- unaffected 6.6.156 – ≤ 6.6.*
- unaffected 6.12.108 – ≤ 6.12.*
- unaffected 6.18.49 – ≤ 6.18.*
- unaffected 7.1.13 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References (6)
- https://git.kernel.org/stable/c/09aa68552d2542cc6c23edd1568ac265dc5d886f (opens in a new tab)
- https://git.kernel.org/stable/c/429b6f43b4d8c98988fdca99e02dc156134e3d77 (opens in a new tab)
- https://git.kernel.org/stable/c/d8636c8f9f95d0fd1e2f6f1cad0d5757aa6f212a (opens in a new tab)
- https://git.kernel.org/stable/c/c0a9bd5fca0b5f2dea32b0fc31350e71e8648112 (opens in a new tab)
- https://git.kernel.org/stable/c/ec8fcaf354c1cbb36755d48e9f5a00c9591349e5 (opens in a new tab)
- https://git.kernel.org/stable/c/0f38453cdb2e17566ccb7c0f3dabd5bd21caca26 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-98164)Record last updated .