---
title: "CVE-2026-80971: Linux Kernel ALSA bcd2000 - Use After Free"
description: "Linux kernel ALSA bcd2000 contains a use-after-free vulnerability caused by freed URB pointers not being cleared on device disconnect, letting local attackers cause memory corruption or kernel crash, exploit requires device unplug during substream use."
url: https://panop.io/threat-heartbeat/CVE-2026-80971/
---

# CVE-2026-80971 Linux Kernel ALSA bcd2000 - Use After Free

Linux kernel ALSA bcd2000 contains a use-after-free vulnerability caused by freed URB pointers not being cleared on device disconnect, letting local attackers cause memory corruption or kernel crash, exploit requires device unplug during substream use.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.16% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-80971)

## Details

Type

Use After Free

Impact

Denial Of Service

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 containing the fix for ALSA bcd2000 URB pointer clearing on disconnect.

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-2026-80971](https://nvd.nist.gov/vuln/detail/CVE-2026-80971)
- [https://git.kernel.org/stable/c/9af08677aa57debaca5b57c8045c52a83d3dd376](https://git.kernel.org/stable/c/9af08677aa57debaca5b57c8045c52a83d3dd376)
- [https://git.kernel.org/stable/c/459d3a64766f5ca2f1886daeaf24582831a5f5ab](https://git.kernel.org/stable/c/459d3a64766f5ca2f1886daeaf24582831a5f5ab)
- [https://git.kernel.org/stable/c/7df3194bdb7479cad9199889655a566a2c0c1d1b](https://git.kernel.org/stable/c/7df3194bdb7479cad9199889655a566a2c0c1d1b)
- [https://git.kernel.org/stable/c/b06ebc7fe25a6af4a9f6e4a3d4236a4178ad4b01](https://git.kernel.org/stable/c/b06ebc7fe25a6af4a9f6e4a3d4236a4178ad4b01)
- [https://git.kernel.org/stable/c/eb482a06791d6168beb8c78cc904ac5a5ed96a55](https://git.kernel.org/stable/c/eb482a06791d6168beb8c78cc904ac5a5ed96a55)
- [https://git.kernel.org/stable/c/3c00004f134fc819f9d9e202c6a64acde0a1f8d0](https://git.kernel.org/stable/c/3c00004f134fc819f9d9e202c6a64acde0a1f8d0)
- [https://git.kernel.org/stable/c/5a77febac6faf6da40fbb4555f703eeb91b58130](https://git.kernel.org/stable/c/5a77febac6faf6da40fbb4555f703eeb91b58130)
- [https://git.kernel.org/stable/c/6c07aad8a7c9ef8ebc4d03a964b882123a349a2e](https://git.kernel.org/stable/c/6c07aad8a7c9ef8ebc4d03a964b882123a349a2e)

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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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