Reachable assertion in Linux kernel - CVE-2026-89727
Published: September 12, 2026
Vulnerability identifier: #VU149070
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89727
CWE-ID: CWE-617
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a reachable assertion in vgic_v2_deactivate() in the KVM arm64 GICv2 virtual interrupt controller when a guest running with EOImode==1 writes an out-of-range INTID to GICV_DIR. A local user can supply an out-of-range INTID to GICV_DIR to cause a denial of service.
The host panics only when panic_on_warn is enabled.
Affected software
Linux kernel
How to mitigate CVE-2026-89727
Install security update from vendor's repository.