NULL pointer dereference in Linux kernel - CVE-2026-43099
Published: May 7, 2026
Vulnerability identifier: #VU130659
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-2026-43099
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 icmp_build_probe() when processing probe requests that use an IPv6 interface identifier while the IPv6 stack is inactive. A remote attacker can send a specially crafted probe request to cause a denial of service.
The issue occurs when IPv6 support is configured as a module and is not loaded.
How to mitigate CVE-2026-43099
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/47a8bf52156ac7e7a581eca31c1f964ba4258d4d
- https://git.kernel.org/stable/c/5b9911582d441f72fe6ccb15ffe3303bbc07f6f5
- https://git.kernel.org/stable/c/6be325206850a0891896d38bcf83a09d8b54ec48
- https://git.kernel.org/stable/c/f91b3ed9e7fa82a70511b5f6901c88379acf2964
- https://git.kernel.org/stable/c/fde29fd9349327acc50d19a0b5f3d5a6c964dfd8