CVE-2026-98713
kernel: KVM: arm64: Apply the fine-grained UNDEFs without FEAT_FGT
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · October 18, 2026
Updated · October 23, 2026
Description
A flaw was found in the Linux kernel's KVM (Kernel-based Virtual Machine) subsystem for ARM64. A malicious guest user can cause a denial of service (DoS) on the host system by executing specific instructions on hardware lacking Fine-Grained Traps (FGT) support. Because trap configurations were improperly restricted based on hardware capabilities, unexpected traps reach the host kernel handler and trigger a kernel warning condition.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 6.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
CWE-617 · Reachable Assertion