Integer overflow in Linux kernel - CVE-2026-89918

Vulnerability identifier: #VU150375

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-2026-89918

CWE-ID: CWE-190

Exploitation vector: Local access

Exploit availability: No public exploit available

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.

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)

Install security update from vendor's repository.

linux (Ubuntu package) - update to 7.0.0-42.42
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17

• https://git.kernel.org/stable/c/34af2c3e31f91a739dc175459fdbd99ed952b457
• https://git.kernel.org/stable/c/c624731ca6fe59ad8909ce4108301aa7560a91d6
• https://git.kernel.org/stable/c/ce447651a52ec077694172af10c4fffb11f56c43

• Integer overflow in Linux kernel arm64 kvm
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more