PT-2026-39084 · Linux · Linux Kernel

Published 2026-05-08 · Updated 2026-05-15 · CVE-2026-43423

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 An issue exists in the usb gadget f ncm component where the ncm set alt() function holds a mutex to prevent races with configfs. This action invokes a sleeping function within an atomic context, which is an invalid operation. To resolve this, the struct net device pointer was removed from the f ncm opts structure to eliminate contention, and connection state is now managed via a boolean flag.

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

Related Identifiers

CVE-2026-43423

Affected Products

Linux Kernel

References · 12

• https://nvd.nist.gov/vuln/detail/CVE-2026-43423 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-43423 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-43423 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-43423 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2026-43423 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-43423 · Vendor Advisory
• https://git.kernel.org/stable/c/e95120b4b95ef1c16d8e94e201ae89f5e59e2612 · Note
• https://twitter.com/hetmehtaa/status/2055151398283837677 · Twitter Post
• https://git.kernel.org/stable/c/0d6c8144ca4d93253de952a5ea0028c19ed7ab68 · Note
• https://twitter.com/CVEnew/status/2052767650590458319 · Twitter Post
• https://git.kernel.org/stable/c/e533a44fb1b337d14f772585b67328bee2e0b5e3 · Note
• https://git.kernel.org/linus/0d6c8144ca4d93253de952a5ea0028c19ed7ab68 · Note