---
id: CVE-2026-98422
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  wifi: mac80211: reset the AP_VLAN tailroom counter on ifdown

  On ifup, AP_VLAN interfaces get crypto_tx_tailroom_needed_cnt from
  the AP interface, but it's never decrem…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  wifi: mac80211: reset the AP_VLAN tailroom counter on ifdown

  On ifup, AP_VLAN interfaces get crypto_tx_tailroom_needed_cnt from
  the AP interface, but it's never decrem…
severity: none
published: '2026-10-14'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T14:17:53.737'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98422'
references:
  - url: 'https://git.kernel.org/stable/c/304a874670a0b6ab5589a7f60b4af0251797b121'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/3d76b45e8432c0d75fcb9e90d92eaa3176898adf'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4504f3960dc4501c73be9f99eabda2e26e9db41e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4b54d01b48445b66c9e576de92b90a3a3ae7b34a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/7775759e3cb35ef5a571b2d877c2a9b70a5d5f08'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/875835377d8d62c849b4eb03a7abfafa71d7668f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b0b32d3f163d24ea7134380666193bf398e9dc0b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f6b34a7d64324faf28eedc0f8678b0f832f1cc36'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
ingestedAt: '2026-10-14T15:36:13.989Z'
---

## Overview

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

wifi: mac80211: reset the AP_VLAN tailroom counter on ifdown

On ifup, AP_VLAN interfaces get crypto_tx_tailroom_needed_cnt from
the AP interface, but it's never decremented again unless the AP is
also brought down. Thus, bringing the same AP_VLAN up again will
increment the counter again and eventually hit the sanity check:

  WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt !=
               master->crypto_tx_tailroom_needed_cnt);

Reset it on ifdown to avoid that.

## Remediation

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