PT-2026-36391 · Linux · Linux Kernel

Published 2026-05-01 · Updated 2026-05-08 · CVE-2026-31756

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 spin lock/unlock mismatch exists in the dwc2 hsotg udc stop() function. The dwc2 gadget exit clock gating() function internally utilizes the call gadget() macro, which requires hsotg->lock to be held because it performs spin unlock/spin lock operations during the gadget driver callback. Because dwc2 hsotg udc stop() invokes dwc2 gadget exit clock gating() without holding the lock, it results in a spin unlock on a lock that is not held, leading to undefined behavior and a subsequent deadlock when spin lock irqsave() is called later in the same function.

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

Improper Locking

Weakness Enumeration

CWE-667

Related Identifiers

CVE-2026-31756

ECHO-AA84-6BF0-5755

Affected Products

Linux Kernel

References · 17

• https://git.kernel.org/stable/c/4ed9d2dd9f29828c311db6ec4b8e0d34bfd6d6a4 · Patch
• https://osv.dev/vulnerability/BELL-CVE-2026-31756 · Vendor Advisory
• https://git.kernel.org/stable/c/9bb4b5ed7f8c4f95cc556bdf042b0ba2fa13557a · Patch
• https://ubuntu.com/security/CVE-2026-31756 · Vendor Advisory
• https://git.kernel.org/stable/c/8ffe31acb3b77a30ae34d01719a269881569fb7f · Patch
• https://cve.org/CVERecord?id=CVE-2026-31756 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2026-31756 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-31756 · Security Note
• https://git.kernel.org/stable/c/beab10429439e20708036a66fb0d97ffb79da6a1 · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-31756 · Vendor Advisory
• https://git.kernel.org/stable/c/51b62286fc668c6eb74dee7624ec0beec3c5a0ed · Patch
• https://git.kernel.org/stable/c/61937f686290494998236c680ce0836b8dd63a3f · Patch
• https://git.kernel.org/stable/c/e9fcca3e87463013d595c65c2189ffaa32ad3b50 · Patch
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-31756 · Vendor Advisory
• https://git.kernel.org/linus/9bb4b5ed7f8c4f95cc556bdf042b0ba2fa13557a · Note