Improper initialization in Linux kernel - CVE-2026-89908
Published: September 17, 2026
Vulnerability identifier: #VU150384
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89908
CWE-ID: CWE-665
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to compromise confidentiality, integrity, and availability.
The vulnerability exists due to improper preservation of memslot architecture flags in the LoongArch KVM memory-region handling code when processing a KVM_MR_FLAGS_ONLY memory-region update. A local user can perform a KVM_MR_FLAGS_ONLY update to compromise confidentiality, integrity, and availability.
The issue occurs when guest physical and host virtual address offsets within a PMD differ.
Affected software
Linux kernel
How to mitigate CVE-2026-89908
Install security update from vendor's repository.