PT-2026-39097 · Linux · Linux Kernel

Jann Horn · Published 2026-05-08 · Updated 2026-05-21 · CVE-2026-43436

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 NULL dereference can occur in the USB-audio driver's Scarlett2 mixer quirk when processing a malformed USB descriptor. This happens because the scarlett2 find fc interface() function assumes an endpoint exists in the parsed interface without verification.

Recommendations Apply the update that implements a sanity check for bNumEndpoints to skip invalid interfaces.

Fix

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

CVE-2026-43436

Affected Products

Linux Kernel

References · 18

• https://git.kernel.org/stable/c/b267255c15d2a5b90c4e926146aa155e5161e264 · Patch
• https://git.kernel.org/stable/c/df1d8abf36ca3681c21a6809eaa9a1e01ef897a6 · Patch
• https://cve.org/CVERecord?id=CVE-2026-43436 · Security Note
• https://git.kernel.org/stable/c/c5c5a6c53cf3b658f1d4512dfa61f3cd25bc34ba · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-43436 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-43436 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-43436 · Vendor Advisory
• https://git.kernel.org/stable/c/3d4f23885e4b90347c9a1d779af6e79a99b5172a · Patch
• https://ubuntu.com/security/CVE-2026-43436 · Vendor Advisory
• https://git.kernel.org/stable/c/b014cc945baba75816cda0cf8934be87c9ed4947 · Patch
• https://osv.dev/vulnerability/BELL-CVE-2026-43436 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-43436 · Vendor Advisory
• https://git.kernel.org/stable/c/3d542cf3c4c854cdf5d58049771f68926b9eb2b9 · Patch
• https://twitter.com/hetmehtaa/status/2055151398283837677 · Twitter Post
• https://twitter.com/CVEnew/status/2052767633993523624 · Twitter Post