NULL pointer dereference in Linux kernel - CVE-2026-43421
Published: May 8, 2026
Vulnerability identifier: #VU130754
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-2026-43421
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 the f_ncm usb gadget network device lifecycle handling when disconnecting or unbinding the gadget device. A local user can trigger a crafted gadget disconnect or unbind sequence to cause a denial of service.
The issue occurs because the network device can outlive its parent gadget device, leaving dangling sysfs links.
How to mitigate CVE-2026-43421
Install security update from vendor's repository.