---
id: CVE-2026-90372
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  wifi: mt76: mt7915: avoid nss underflow in mt7915_mcu_get_sta_nss

  If a peer's VHT/HE MCS map has no supported spatial stream (all fields
  0x3), the loop exits with nss …
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  wifi: mt76: mt7915: avoid nss underflow in mt7915_mcu_get_sta_nss

  If a peer's VHT/HE MCS map has no supported spatial stream (all fields
  0x3), the loop exits with nss …
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H'
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 89029a85482cbcf68026a89fc974e8f6898d6b37 <
    2801477c36a19be4f549fe60e54995f03b0ea7b9
  - >-
    Linux >= 89029a85482cbcf68026a89fc974e8f6898d6b37 <
    38f4d6323bcd65e41a691432eddabd2b03acdeee
  - >-
    Linux >= 89029a85482cbcf68026a89fc974e8f6898d6b37 <
    25f753f7f620955a8a51e63e445d8b9076c51396
  - >-
    Linux >= 89029a85482cbcf68026a89fc974e8f6898d6b37 <
    e63c6291ecddf94769ab91f9d8cdb6ca939f7fc6
  - >-
    Linux >= 89029a85482cbcf68026a89fc974e8f6898d6b37 <
    85bd46ab7674b6d357f9a14791352c65fb09eee9
  - >-
    Linux >= 89029a85482cbcf68026a89fc974e8f6898d6b37 <
    6ce78d04c7ea4b66838941b5a4232dd1ee0e2cc7
  - >-
    Linux >= 89029a85482cbcf68026a89fc974e8f6898d6b37 <
    ecfd1a07e78c31d81322fb2d81dc468081cc3004
  - >-
    Linux >= 89029a85482cbcf68026a89fc974e8f6898d6b37 <
    4a2f4be532e3ea4e2b536e411793a05aaa51af25
  - Linux 5.8
published: '2026-09-17'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T18:17:55.750'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90372'
references:
  - url: 'https://git.kernel.org/stable/c/25f753f7f620955a8a51e63e445d8b9076c51396'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/2801477c36a19be4f549fe60e54995f03b0ea7b9'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/38f4d6323bcd65e41a691432eddabd2b03acdeee'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4a2f4be532e3ea4e2b536e411793a05aaa51af25'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/6ce78d04c7ea4b66838941b5a4232dd1ee0e2cc7'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/85bd46ab7674b6d357f9a14791352c65fb09eee9'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e63c6291ecddf94769ab91f9d8cdb6ca939f7fc6'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ecfd1a07e78c31d81322fb2d81dc468081cc3004'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
epss: 0.00408
epssPercentile: 0.32271
ingestedAt: '2026-09-17T16:21:47.808Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

wifi: mt76: mt7915: avoid nss underflow in mt7915_mcu_get_sta_nss

If a peer's VHT/HE MCS map has no supported spatial stream (all fields
0x3), the loop exits with nss == 0 and the function returned (u8)-1 (255),
which was then written into the firmware sta_rec_bf beamforming fields.
Clamp the result to 0.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.