Incorrect Conversion between Numeric Types in Linux kernel - CVE-2026-89775
Published: September 17, 2026
Vulnerability identifier: #VU150511
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-2026-89775
CWE-ID: CWE-681
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to compromise confidentiality, integrity, and availability.
The vulnerability exists due to incorrect conversion of a negative mapping level to an unsigned value in the arm64 KVM nested virtualization TLB size evaluation logic when evaluating VNCR TLB invalidation with the S1 MMU disabled. A remote attacker can trigger TLB invalidation evaluation using an S1 MMU-disabled mapping level to compromise confidentiality, integrity, and availability.
Affected software
Linux kernel
How to mitigate CVE-2026-89775
Install security update from vendor's repository.