PT-2026-39082 · Linux · Linux Kernel

Published 2026-05-08 · Updated 2026-06-19 · CVE-2026-43421

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A flaw in the f ncm USB gadget driver allows a network device to outlive its parent gadget device during disconnection. This leads to dangling sysfs links and null pointer dereference problems, which can cause system crashes.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

CVE-2026-43421

Affected Products

Linux Kernel

References · 21

• https://osv.dev/vulnerability/UBUNTU-CVE-2026-43421 · Vendor Advisory
• https://git.kernel.org/stable/c/85acaba2f42b557499bab3608307f17bf13beb69 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-43421 · Security Note
• https://git.kernel.org/stable/c/e584cb58a2ea7ff4d3a4bc43d5ca512ed3ecb77d · Patch
• https://osv.dev/vulnerability/BELL-CVE-2026-43421 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-43421 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-43421 · Vendor Advisory
• https://git.kernel.org/stable/c/ec35c1969650e7cb6c8a91020e568ed46e3551b0 · Patch
• https://osv.dev/vulnerability/ROOT-OS-UBUNTU-2204-CVE-2026-43421 · Vendor Advisory
• https://git.kernel.org/stable/c/93f116c3393a22acab96ad1bef12b2572eb80ca4 · Patch
• https://security-tracker.debian.org/tracker/CVE-2026-43421 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-43421 · Security Note
• https://git.kernel.org/stable/c/7c97366f5dac5255e60a317ffe3a5b18f3745547 · Note
• https://t.me/cveNotify/164635 · Telegram Post
• https://git.kernel.org/linus/ec35c1969650e7cb6c8a91020e568ed46e3551b0 · Note