Race condition in Linux kernel - CVE-2026-89916

Vulnerability identifier: #VU150373

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-2026-89916

CWE-ID: CWE-362

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to disclose information, modify data, or cause a denial of service.

The vulnerability exists due to a race condition in KVM arm64 VNCR TLB handling when concurrently translating VNCR and invalidating stage 1 page-table entries. A remote attacker can trigger concurrent VNCR translation and stage 1 page-table invalidation to disclose information, modify data, or cause a denial of service.

A stale VNCR TLB entry can be inserted after the corresponding page-table entry has been invalidated.

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/11ee3faab4f1755d126bead9f882e75a7a677860
• https://git.kernel.org/stable/c/2b7324f3a0c1072b9d578b8d42f199506753f26e
• https://git.kernel.org/stable/c/d8580e7aa189b0c6c5bb4d94b8352728a7c35bbd

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