---
title: "CVE-2026-89736: Linux Kernel usb gadget u_audio - Use After Free"
description: "Linux kernel usb gadget u_audio contains a use-after-free vulnerability caused by premature freeing of snd_uac_chip during sound card disconnect, letting local userspace applications cause memory corruption, exploit requires open ALSA control elements."
url: https://panop.io/threat-heartbeat/CVE-2026-89736/
---

# CVE-2026-89736 Linux Kernel usb gadget u\_audio - Use After Free

Linux kernel usb gadget u\_audio contains a use-after-free vulnerability caused by premature freeing of snd\_uac\_chip during sound card disconnect, letting local userspace applications cause memory corruption, exploit requires open ALSA control elements.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.13% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89736)

## Details

Type

Use After Free

Impact

Use After Free

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Published

11 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version with the fix for deferred snd\_uac\_chip destruction.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-89736](https://nvd.nist.gov/vuln/detail/CVE-2026-89736)
- [https://git.kernel.org/stable/c/c74ff0b1a0fca53d3ac185873c87d6a719b30a47](https://git.kernel.org/stable/c/c74ff0b1a0fca53d3ac185873c87d6a719b30a47)
- [https://git.kernel.org/stable/c/6f46762196f04464e1050a9ee94e72b917db9010](https://git.kernel.org/stable/c/6f46762196f04464e1050a9ee94e72b917db9010)
- [https://git.kernel.org/stable/c/891a8d11f4d5eb50b2ce7570f4f98204a7a57493](https://git.kernel.org/stable/c/891a8d11f4d5eb50b2ce7570f4f98204a7a57493)
- [https://git.kernel.org/stable/c/a7ecd1a04f4f485d7be6443d0f0b2c61a800cb82](https://git.kernel.org/stable/c/a7ecd1a04f4f485d7be6443d0f0b2c61a800cb82)
- [https://git.kernel.org/stable/c/f983793f03148b097977f200298db215cd2d4438](https://git.kernel.org/stable/c/f983793f03148b097977f200298db215cd2d4438)
- [https://git.kernel.org/stable/c/4e747c864a88537e18b1ffc19a1954c9686bb8e1](https://git.kernel.org/stable/c/4e747c864a88537e18b1ffc19a1954c9686bb8e1)
- [https://git.kernel.org/stable/c/79a92896e2bb9471550c56fc23d8d93592f04c27](https://git.kernel.org/stable/c/79a92896e2bb9471550c56fc23d8d93592f04c27)
- [https://git.kernel.org/stable/c/858965947081d10d41d9a1010a540d3d5eea958b](https://git.kernel.org/stable/c/858965947081d10d41d9a1010a540d3d5eea958b)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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