Use-after-free in Linux kernel - CVE-2026-98927
Published: October 23, 2026
Vulnerability identifier: #VU157581
CSH Severity: Low
CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-98927
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to potentially cause a denial of service through a kernel crash.
The vulnerability exists due to use-after-free in the Linux kernel arm64 KVM nested virtualization component when VCPU_INIT relocates the nested_mmus array while a vCPU is running an L2 guest. A local user can trigger concurrent vCPU initialization and nested guest execution to potentially cause a denial of service by leaving the running vCPU accessing a freed shadow page table structure.
Affected software
Linux kernel
How to mitigate CVE-2026-98927
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3