---
title: "CVE-2026-90207: Linux Kernel ALSA seq midi - Denial of Service"
description: "Linux kernel ALSA seq midi contains a NULL pointer dereference caused by unsynchronized input teardown in snd_midi_input_event during rawmidi substream closing, letting attackers cause kernel crash, exploit requires triggering rawmidi input events."
url: https://panop.io/threat-heartbeat/CVE-2026-90207/
---

# CVE-2026-90207 Linux Kernel ALSA seq midi - Denial of Service

Linux kernel ALSA seq midi contains a NULL pointer dereference caused by unsynchronized input teardown in snd\_midi\_input\_event during rawmidi substream closing, letting attackers cause kernel crash, exploit requires triggering rawmidi input events.

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-2026-90207)

## Details

Type

Denial of Service

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

17 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the patch for this issue.

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-2026-90207](https://nvd.nist.gov/vuln/detail/CVE-2026-90207)
- [https://git.kernel.org/stable/c/210c193a9ef1312fab153948c6928e4cfaa1f03b](https://git.kernel.org/stable/c/210c193a9ef1312fab153948c6928e4cfaa1f03b)
- [https://git.kernel.org/stable/c/282a3ef9e4b63b2f6823bbbb3c1a90b002cdaf12](https://git.kernel.org/stable/c/282a3ef9e4b63b2f6823bbbb3c1a90b002cdaf12)
- [https://git.kernel.org/stable/c/403f7f3ad3808a0096d84cf228fab68dc253fd9d](https://git.kernel.org/stable/c/403f7f3ad3808a0096d84cf228fab68dc253fd9d)
- [https://git.kernel.org/stable/c/6290afaae54c7a9fa3bca3b4d5433e6d83e8669d](https://git.kernel.org/stable/c/6290afaae54c7a9fa3bca3b4d5433e6d83e8669d)
- [https://git.kernel.org/stable/c/89d986897aff7275b42e075e556731b8353366af](https://git.kernel.org/stable/c/89d986897aff7275b42e075e556731b8353366af)
- [https://git.kernel.org/stable/c/de76a2b47582cd6dba2e15f024681bf377ecc94a](https://git.kernel.org/stable/c/de76a2b47582cd6dba2e15f024681bf377ecc94a)

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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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