CVE-2026-98164 is a vulnerability in Linux Kernel
Published on September 29, 2026
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]
Products Associated with CVE-2026-98164
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Affected Versions
Linux:- Version 699023e239658e62da6f42f47d31b54788521ec1 and below 09aa68552d2542cc6c23edd1568ac265dc5d886f is affected.
- Version 699023e239658e62da6f42f47d31b54788521ec1 and below 429b6f43b4d8c98988fdca99e02dc156134e3d77 is affected.
- Version 699023e239658e62da6f42f47d31b54788521ec1 and below d8636c8f9f95d0fd1e2f6f1cad0d5757aa6f212a is affected.
- Version 699023e239658e62da6f42f47d31b54788521ec1 and below c0a9bd5fca0b5f2dea32b0fc31350e71e8648112 is affected.
- Version 699023e239658e62da6f42f47d31b54788521ec1 and below ec8fcaf354c1cbb36755d48e9f5a00c9591349e5 is affected.
- Version 699023e239658e62da6f42f47d31b54788521ec1 and below 0f38453cdb2e17566ccb7c0f3dabd5bd21caca26 is affected.
- Version 4.2 is affected.
- Before 4.2 is unaffected.
- Version 6.1.187, <= 6.1.* is unaffected.
- Version 6.6.156, <= 6.6.* is unaffected.
- Version 6.12.108, <= 6.12.* is unaffected.
- Version 6.18.49, <= 6.18.* is unaffected.
- Version 7.1.13, <= 7.1.* is unaffected.
- Version 7.2, <= * is unaffected.