SB2026091247 - Reachable assertion in Linux kernel kvm vgic
Published: September 12, 2026
Security Bulletin ID
SB2026091247
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Reachable assertion (CVE-ID: CVE-2026-89727)
CWE-ID: CWE-617 - Reachable Assertion
CVSSv4: 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]
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.
Remediation
Install update from vendor's website.