NULL pointer dereference in Linux kernel - CVE-2026-43441
Published: May 8, 2026
Vulnerability identifier: #VU130740
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-43441
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to a NULL pointer dereference in the bonding driver IPv6 neighbor advertisement validation path when processing IPv6 NS/NA packets on a slave while ARP/NS validation is enabled and IPv6 is disabled. A remote attacker can send a specially crafted IPv6 NS/NA packet to trigger a kernel crash and cause a denial of service.
Exploitation requires the system to be booted with the 'ipv6.disable=1' parameter and bonding ARP/NS validation to be enabled.
How to mitigate CVE-2026-43441
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/30021e969d48e5819d5ae56936c2f34c0f7ce997
- https://git.kernel.org/stable/c/49dbfcb70eca5f6f9043594e1e323c74c39e3863
- https://git.kernel.org/stable/c/95faa1459b83fa544191e82ccc73856f03b7741f
- https://git.kernel.org/stable/c/c78f01abe535853f13f0b26cd5b1d2f19bf52e2f
- https://git.kernel.org/stable/c/c9c238066fb254dabf65e27379f93c56112c5b96
- https://git.kernel.org/stable/c/cf6099ef493b94e140b0fad52482a78853115318