CVE-2026-89911

7.9 HIGH

Published 2026-09-16 · Updated 2026-09-16

AI risk analysis

Summary: This vulnerability allows a guest operating system to potentially overflow a TLB invalidation range, leading to a potential privilege escalation or denial of service condition.
Exploitability: Exploiting this vulnerability requires a guest OS with the ability to generate a large TLB invalidation range, making it moderately difficult. The hypervisor must be naive enough to accept the range without proper validation.
Blast radius: If exploited, the impact could be significant, potentially allowing a guest to escalate privileges or cause a denial of service on the host system.
Detection: No reliable host or network indicator is derivable from the published description.
Prioritized remediation: Upgrade to the fixed version 6.1.1 or later.

privilege-escalationdenial-of-servicehypervisor

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.

NVD description

In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Correctly cap TLBI Range to the architural limit TLB Invalidation by Range has a fairly powerful way of encoding pretty large ranges in a small number of bits. This range can be based on an arbitrary VA, which means it is pretty easy for a guest to generate an overflow should the hypervisor be naive enough to add the range to the base... Make sure the range is capped to the limit dictated by the address bit that determines the VA range. For an IPA invalidation, this is further corrected down the line to ignore the upper range.

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H

References

Data: NVD (public domain). Analysis: local $0 model. Defensive use only.