High 7.1Published Sep 29, 2026

CVE-2026-98164KVM: x86/mmu: Check write tracking in all address spaces

Updated under an hour ago (Oct 27, 2026, 5:50 AM ET)

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Exploited in the last 30 days

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]

CVSS: 7.1 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 7, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	699023e239658e62da6f42f47d31b54788521ec1 builds before 09aa68552d2542cc6c23edd1568ac265dc5d886f; 699023e239658e62da6f42f47d31b54788521ec1 builds before 429b6f43b4d8c98988fdca99e02dc156134e3d77; from 699023e239658e62da6f42f47d31b54788521ec1 before d8636c8f9f95d0fd1e2f6f1cad0d5757aa6f212a; from 699023e239658e62da6f42f47d31b54788521ec1 before c0a9bd5fca0b5f2dea32b0fc31350e71e8648112; from 699023e239658e62da6f42f47d31b54788521ec1 before ec8fcaf354c1cbb36755d48e9f5a00c9591349e5; 699023e239658e62da6f42f47d31b54788521ec1 builds before 0f38453cdb2e17566ccb7c0f3dabd5bd21caca26	CNA record
linux linux_kernel linux:linux_kernel	from 4.2 before 6.1.187; from 6.2 before 6.6.156; from 6.7 before 6.12.108; from 6.13 before 6.18.49; from 6.19 before 7.1.13; 7.2; 7.2; 7.2; and 2 more ranges	NVD

References

References

https://git.kernel.org/stable/c/09aa68552d2542cc6c23edd1568ac265dc5d886f	patch
https://git.kernel.org/stable/c/429b6f43b4d8c98988fdca99e02dc156134e3d77	patch
https://git.kernel.org/stable/c/d8636c8f9f95d0fd1e2f6f1cad0d5757aa6f212a	patch
https://git.kernel.org/stable/c/c0a9bd5fca0b5f2dea32b0fc31350e71e8648112	patch
https://git.kernel.org/stable/c/ec8fcaf354c1cbb36755d48e9f5a00c9591349e5	patch
https://git.kernel.org/stable/c/0f38453cdb2e17566ccb7c0f3dabd5bd21caca26	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.