SB2026091753 - Integer overflow in Linux kernel arm64 kvm
Published: September 17, 2026
Security Bulletin ID
SB2026091753
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Integer overflow (CVE-ID: CVE-2026-89918)
CWE-ID: CWE-190 - Integer overflow
CVSSv4: 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]
The vulnerability allows a remote attacker to cause a failed TLB invalidation.
The vulnerability exists due to improper handling of address rollover in KVM arm64 virtual-address TLB invalidation when invalidating the last page or block in the TTBR1 virtual address space. A remote attacker can trigger a virtual-address TLB invalidation at the end of the address space to cause a failed TLB invalidation.
Remediation
Install update from vendor's website.