CVE-2026-98164 | BDVDB-2026-380752 Detail
LinuxLinux
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]
Impact#
Per CVSS v3.1: confidentiality impact high, integrity impact none, availability impact high. Attack vector: local.
Weaknesses#
No weakness recorded in the source data.
References#
- https://git.kernel.org/stable/c/09aa68552d2542cc6c23edd1568ac265dc5d886f
- https://git.kernel.org/stable/c/429b6f43b4d8c98988fdca99e02dc156134e3d77
- https://git.kernel.org/stable/c/d8636c8f9f95d0fd1e2f6f1cad0d5757aa6f212a
- https://git.kernel.org/stable/c/c0a9bd5fca0b5f2dea32b0fc31350e71e8648112
- https://git.kernel.org/stable/c/ec8fcaf354c1cbb36755d48e9f5a00c9591349e5
- https://git.kernel.org/stable/c/0f38453cdb2e17566ccb7c0f3dabd5bd21caca26
Exploit#
No public exploit known
History#
- Version 1Record published in the CVE List.
- Version 2Most recent update recorded in the CVE List.