NULL pointer dereference in Linux kernel - CVE-2026-64288
Published: July 27, 2026
Vulnerability identifier: #VU139700
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-2026-64288
CWE-ID: CWE-476
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 NULL pointer dereference in arch/arm64/kvm/nested.c when processing VNCR TLB invalidation from MMU notifiers or TLBI instructions. A local user can trigger a race condition involving a vcpu that is not yet onlined or an invalid pseudo-TLB to cause a denial of service.
The issue affects arm64 KVM nested virtualization handling.
Affected software
Linux kernel
How to mitigate CVE-2026-64288
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3