---
id: CVE-2026-90114
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net: bridge: Reject descending VLAN tunnel ranges

  A pair of descending VLAN and tunnel IDs can pass the tunnel range span
  check
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net: bridge: Reject descending VLAN tunnel ranges

  A pair of descending VLAN and tunnel IDs can pass the tunnel range span
  check. The VLAN subtraction produces a negati…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 94339443686b36d3223bc032b7947267474e2679 <
    1181f6bad009408a259bab6aaf0681f11b487972
  - >-
    Linux >= 94339443686b36d3223bc032b7947267474e2679 <
    5a8e0e3a18b5e3172343b8479c5d04187f5b4795
  - >-
    Linux >= 94339443686b36d3223bc032b7947267474e2679 <
    0874a6d5275091429ec4c675c54c53a8776665ae
  - >-
    Linux >= 94339443686b36d3223bc032b7947267474e2679 <
    4b0f5b25f114651f03058395b490626c4444875e
  - >-
    Linux >= 94339443686b36d3223bc032b7947267474e2679 <
    bd741b819ff1c239d26cc5b0f0e6b1fd4e67ed17
  - >-
    Linux >= 94339443686b36d3223bc032b7947267474e2679 <
    c0444d7499f113d6b7803ef0175591464e17525e
  - >-
    Linux >= 94339443686b36d3223bc032b7947267474e2679 <
    434849b21ef56b09d16e6366b2a230002f363e45
  - >-
    Linux >= 94339443686b36d3223bc032b7947267474e2679 <
    b74a072d8fb71d3c9ffba4a17d5943e63266fb38
  - Linux 5.9
published: '2026-09-17'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T17:17:03.477'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90114'
references:
  - url: 'https://git.kernel.org/stable/c/0874a6d5275091429ec4c675c54c53a8776665ae'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/1181f6bad009408a259bab6aaf0681f11b487972'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/434849b21ef56b09d16e6366b2a230002f363e45'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4b0f5b25f114651f03058395b490626c4444875e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5a8e0e3a18b5e3172343b8479c5d04187f5b4795'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b74a072d8fb71d3c9ffba4a17d5943e63266fb38'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/bd741b819ff1c239d26cc5b0f0e6b1fd4e67ed17'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c0444d7499f113d6b7803ef0175591464e17525e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-17T16:21:47.886Z'
epss: 0.0022
epssPercentile: 0.11036
---

## Overview

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

net: bridge: Reject descending VLAN tunnel ranges

A pair of descending VLAN and tunnel IDs can pass the tunnel range span
check. The VLAN subtraction produces a negative int, which is converted
to unsigned when compared with the u32 tunnel ID subtraction. It can
therefore equal the wrapped tunnel ID delta.

The range loop then performs no iterations. Since the batched
notification handling added a post-loop error check, this leaves err
uninitialized and makes the request's return value unpredictable.

Reject descending VLAN ranges before comparing the spans. Valid
ascending and single-entry ranges remain unchanged, while malformed
descending ranges consistently return -EINVAL.

This issue was found by a static analysis checker and confirmed by
manual source review.

## Remediation

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