NULL pointer dereference in Linux kernel - CVE-2026-53220
Published: June 26, 2026
Vulnerability identifier: #VU135566
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-53220
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a NULL pointer dereference in ebt_redirect_tg() in net/bridge/netfilter/ebt_redirect.c when reinjecting an NFQUEUE packet after bridge port state changes. A local user can remove or reassign the bridge port before reinjection to cause a denial of service.
The issue occurs if the bridge port is removed between the original hook invocation and NFQUEUE reinjection, and the device may also be moved to a different virtual device such as macvlan.
How to mitigate CVE-2026-53220
Install security update from vendor's repository.