---
id: CVE-2026-90366
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  wifi: mt76: mt7996: reserve space for the CSA-abort countdown TLV

  When a CSA countdown is active, mt7996_mcu_beacon_cntdwn() emits two
  bss_bcn_cntdwn_tlv entries (the …
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  wifi: mt76: mt7996: reserve space for the CSA-abort countdown TLV

  When a CSA countdown is active, mt7996_mcu_beacon_cntdwn() emits two
  bss_bcn_cntdwn_tlv entries (the …
severity: medium
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 98686cd21624c75a043e96812beadddf4f6f48e5 <
    1d348f96623ec20d700af7d4dfc00a74da6238ac
  - >-
    Linux >= 98686cd21624c75a043e96812beadddf4f6f48e5 <
    bc1d694a1ffe0062c3adf0db1d64ad54454398ec
  - >-
    Linux >= 98686cd21624c75a043e96812beadddf4f6f48e5 <
    45d8896e4cffffb2c6554ccbec6efe7a0d53166f
  - >-
    Linux >= 98686cd21624c75a043e96812beadddf4f6f48e5 <
    1a51aff0e048dc5b8252d65808b79939c942d6ec
  - >-
    Linux >= 98686cd21624c75a043e96812beadddf4f6f48e5 <
    50c66bab321140c49aa2ed779a3ec9d2f085b458
  - Linux 6.2
published: '2026-09-17'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T17:17:35.700'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90366'
references:
  - url: 'https://git.kernel.org/stable/c/1a51aff0e048dc5b8252d65808b79939c942d6ec'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/1d348f96623ec20d700af7d4dfc00a74da6238ac'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/45d8896e4cffffb2c6554ccbec6efe7a0d53166f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/50c66bab321140c49aa2ed779a3ec9d2f085b458'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/bc1d694a1ffe0062c3adf0db1d64ad54454398ec'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90366.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-90366'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2536146'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-90366'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90366'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-90366.mbox
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ingestedAt: '2026-09-17T16:21:47.810Z'
epss: 0.00168
epssPercentile: 0.05989
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe:
  - CWE-131
---

## Overview

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

wifi: mt76: mt7996: reserve space for the CSA-abort countdown TLV

When a CSA countdown is active, mt7996_mcu_beacon_cntdwn() emits two
bss_bcn_cntdwn_tlv entries (the CSA countdown and the CCA-abort BCC), but
MT7996_BEACON_UPDATE_SIZE only reserved one. With MBSSID enabled and a
near-maximum beacon template the extra 8 bytes could push the offload
command past MT7996_MAX_BSS_OFFLOAD_SIZE and trigger skb_over_panic().
Reserve room for both countdown TLVs.

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Moderate · updated 2026-10-20 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90366.json)