---
title: "CVE-2026-90379: Linux Kernel mt76 - Denial of Service"
description: "Linux kernel mt76 mt7921 driver contains an invalid memory access vulnerability caused by unvalidated DMA queue index reads returning 0xFFFFFFFF during PCIe AER bus hang, letting attackers cause system crashes, exploit requires hardware bus hang condition."
url: https://panop.io/threat-heartbeat/CVE-2026-90379/
---

# CVE-2026-90379 Linux Kernel mt76 - Denial of Service

Linux kernel mt76 mt7921 driver contains an invalid memory access vulnerability caused by unvalidated DMA queue index reads returning 0xFFFFFFFF during PCIe AER bus hang, letting attackers cause system crashes, exploit requires hardware bus hang condition.

CVSS base score 8.8 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.38% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-90379)

## Details

Type

Denial of Service

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:A/AC:L/PR:N/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 fix for mt76 mt7921 PCIe AER handler support.

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-2026-90379](https://nvd.nist.gov/vuln/detail/CVE-2026-90379)
- [https://git.kernel.org/stable/c/f544bcba4721e1074e9bc6666f0ef4f8b96ddba8](https://git.kernel.org/stable/c/f544bcba4721e1074e9bc6666f0ef4f8b96ddba8)
- [https://git.kernel.org/stable/c/670b3dc4e3713542a9f002d38fb9d1740b9e342b](https://git.kernel.org/stable/c/670b3dc4e3713542a9f002d38fb9d1740b9e342b)
- [https://git.kernel.org/stable/c/915672c5ae32deeb72f4572856d123f314791136](https://git.kernel.org/stable/c/915672c5ae32deeb72f4572856d123f314791136)

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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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