NULL pointer dereference in Linux kernel - CVE-2026-64353
Published: July 27, 2026
Vulnerability identifier: #VU139629
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-2026-64353
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 improper handling of lookup result nullness in the bpf verifier when processing constant-key lookups for dynamic inner array maps. A local user can load a crafted bpf program to cause a denial of service.
The issue occurs when an ARRAY_OF_MAPS uses an inner map template created with BPF_F_INNER_MAP and a concrete inner array has a different max_entries value than the template.
Affected software
Linux kernel
How to mitigate CVE-2026-64353
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3