NULL pointer dereference in Linux kernel - CVE-2026-43100
Published: May 7, 2026
Vulnerability identifier: #VU130660
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-2026-43100
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 bridge FDB local VLAN-0 helper functions when handling RTM_NEWLINK requests with IFLA_BR_MULTI_BOOLOPT containing BR_BOOLOPT_FDB_LOCAL_VLAN_0 while bridge VLAN filtering is not enabled. A local user can send a specially crafted netlink request to cause a denial of service.
The issue is triggered when CONFIG_BRIDGE_VLAN_FILTERING is not set.
How to mitigate CVE-2026-43100
Install security update from vendor's repository.