Improper Initialization in Linux kernel - CVE-2026-23425
Published: April 6, 2026
Vulnerability identifier: #VU124946
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-23425
CWE-ID: CWE-665
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause state corruption.
The vulnerability exists due to improper initialization in ID register initialization for non-protected pKVM guests when initializing the hypervisor kvm structure from the host state. A local user can create a non-protected VM to cause state corruption.
The issue affects non-protected arm64 pKVM guests because the ID register initialized flag can be copied without the underlying id_regs data being initialized, causing feature checks at EL2 to fail and some system registers to not be saved or restored during the world switch.
How to mitigate CVE-2026-23425
Install security update from vendor's repository.