Always-Incorrect Control Flow Implementation in Linux kernel - CVE-2026-98164
Published: October 4, 2026
Vulnerability identifier: #VU153232
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-98164
CWE-ID: CWE-670
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to incorrect control flow implementation in the KVM x86 MMU page-tracking logic when checking write tracking across address spaces. A local user can cause a write-tracked guest frame number to be treated as untracked and trigger a kernel BUG to cause a denial of service.
The issue occurs when system management mode uses multiple address spaces.
Affected software
Linux kernel
How to mitigate CVE-2026-98164
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
External References
- https://git.kernel.org/stable/c/09aa68552d2542cc6c23edd1568ac265dc5d886f
- https://git.kernel.org/stable/c/0f38453cdb2e17566ccb7c0f3dabd5bd21caca26
- https://git.kernel.org/stable/c/429b6f43b4d8c98988fdca99e02dc156134e3d77
- https://git.kernel.org/stable/c/c0a9bd5fca0b5f2dea32b0fc31350e71e8648112
- https://git.kernel.org/stable/c/d8636c8f9f95d0fd1e2f6f1cad0d5757aa6f212a
- https://git.kernel.org/stable/c/ec8fcaf354c1cbb36755d48e9f5a00c9591349e5