---
id: CVE-2026-93803
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  wifi: libipw: fix key index receive bound checks

  libipw_rx() reads skb->data[hdrlen + 3] to extract the WEP key index in
  both the software-decrypt key selection path a…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  wifi: libipw: fix key index receive bound checks

  libipw_rx() reads skb->data[hdrlen + 3] to extract the WEP key index in
  both the software-decrypt key selection path a…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-125
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= b453872c35cfcbdbf5a794737817f7d4e7b1b579 <
    bb18262c19feb690ddde58c70e3ad04bc6fe566e
  - >-
    Linux >= b453872c35cfcbdbf5a794737817f7d4e7b1b579 <
    09d4a1bc3a08bb0e19bdf250b9f575cfef0bae82
  - >-
    Linux >= b453872c35cfcbdbf5a794737817f7d4e7b1b579 <
    2836a870f612a8a6d9e390d00fa2cf6c90aa5808
  - >-
    Linux >= b453872c35cfcbdbf5a794737817f7d4e7b1b579 <
    0b61c465ea62063593bc9ac186871b69e58ae991
  - >-
    Linux >= b453872c35cfcbdbf5a794737817f7d4e7b1b579 <
    062840bdc9ee06169b3c371bf66711f1d7ec0bf4
  - >-
    Linux >= b453872c35cfcbdbf5a794737817f7d4e7b1b579 <
    c54b643e9a0936d038921c547736574fd7382cea
  - >-
    Linux >= b453872c35cfcbdbf5a794737817f7d4e7b1b579 <
    74ed3669f26803b1761c1f55403062bea44c3466
  - Linux 2.6.14
published: '2026-09-24'
updated: '2026-10-03'
sourceUpdated: '2026-10-03T11:17:50.060'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93803'
references:
  - url: 'https://git.kernel.org/stable/c/062840bdc9ee06169b3c371bf66711f1d7ec0bf4'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/09d4a1bc3a08bb0e19bdf250b9f575cfef0bae82'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/0b61c465ea62063593bc9ac186871b69e58ae991'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/2836a870f612a8a6d9e390d00fa2cf6c90aa5808'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/74ed3669f26803b1761c1f55403062bea44c3466'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/bb18262c19feb690ddde58c70e3ad04bc6fe566e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c54b643e9a0936d038921c547736574fd7382cea'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93803.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-93803'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2540414'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-93803'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93803'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-93803.mbox
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00173
epssPercentile: 0.06623
cvssSource: vendor
ingestedAt: '2026-09-24T16:47:15.897Z'
---

## Overview

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

wifi: libipw: fix key index receive bound checks

libipw_rx() reads skb->data[hdrlen + 3] to extract the WEP key index in
both the software-decrypt key selection path and the hardware-decrypted
IV/ICV strip path. In both places the existing guard only checks
skb->len >= hdrlen + 3, which proves bytes up to hdrlen + 2 but not the
byte at hdrlen + 3.

Require hdrlen + 4 bytes before reading that item in both paths. This is
a local source-boundary check only; it does not change the key index
semantics.

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Moderate · updated 2026-09-29 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93803.json)