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CVE-2026-98164

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Last modified

CVE-2026-98164 is a vulnerability of currently unknown severity. 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.

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]

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 699023e239658e62da6f42f47d31b54788521ec1, < 09aa68552d2542cc6c23edd1568ac265dc5d886f; >= 699023e239658e62da6f42f47d31b54788521ec1, < 429b6f43b4d8c98988fdca99e02dc156134e3d77; >= 699023e239658e62da6f42f47d31b54788521ec1, < d8636c8f9f95d0fd1e2f6f1cad0d5757aa6f212a; >= 699023e239658e62da6f42f47d31b54788521ec1, < c0a9bd5fca0b5f2dea32b0fc31350e71e8648112; >= 699023e239658e62da6f42f47d31b54788521ec1, < ec8fcaf354c1cbb36755d48e9f5a00c9591349e5; >= 699023e239658e62da6f42f47d31b54788521ec1, < 0f38453cdb2e17566ccb7c0f3dabd5bd21caca26
LinuxLinux4.2

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-98164?
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]
How severe is CVE-2026-98164?
Severity scoring for CVE-2026-98164 is pending analysis.
How do I fix CVE-2026-98164?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST