---
id: CVE-2026-93204
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  batman-adv: dat: atomically update mac addresses

  When a MAC address is updated in batadv_dat_entry_add(), it is done using a
  simple copy function
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  batman-adv: dat: atomically update mac addresses

  When a MAC address is updated in batadv_dat_entry_add(), it is done using a
  simple copy function. A parallel reader mi…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 2f1dfbe185075a50dc8f0490a136377af53a1c62 <
    159360a0de831845c4500b4f8638decdcd624040
  - >-
    Linux >= 2f1dfbe185075a50dc8f0490a136377af53a1c62 <
    259db2c04586d40b82c5c3002b1e28b0698a0bb7
  - >-
    Linux >= 2f1dfbe185075a50dc8f0490a136377af53a1c62 <
    1674855a5b6eacfe35f4db3095d7055c25467274
  - >-
    Linux >= 2f1dfbe185075a50dc8f0490a136377af53a1c62 <
    66238e2a74eca5dabf85b0cd2c3c944e474dc2fd
  - >-
    Linux >= 2f1dfbe185075a50dc8f0490a136377af53a1c62 <
    a5e4d6cb4f6848b8906c1c493f99a8ccc0638515
  - >-
    Linux >= 2f1dfbe185075a50dc8f0490a136377af53a1c62 <
    f68038c77a2f38c09c7e2e4f7fa1f4e246fdf2c9
  - >-
    Linux >= 2f1dfbe185075a50dc8f0490a136377af53a1c62 <
    e6de568d3eda3e3c01c868fabd7a9535d5ee4a73
  - Linux 3.8
published: '2026-09-17'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T17:18:16.773'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93204'
references:
  - url: 'https://git.kernel.org/stable/c/159360a0de831845c4500b4f8638decdcd624040'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/1674855a5b6eacfe35f4db3095d7055c25467274'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/259db2c04586d40b82c5c3002b1e28b0698a0bb7'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/66238e2a74eca5dabf85b0cd2c3c944e474dc2fd'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a5e4d6cb4f6848b8906c1c493f99a8ccc0638515'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e6de568d3eda3e3c01c868fabd7a9535d5ee4a73'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f68038c77a2f38c09c7e2e4f7fa1f4e246fdf2c9'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-17T16:21:47.720Z'
epss: 0.00215
epssPercentile: 0.10519
---

## Overview

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

batman-adv: dat: atomically update mac addresses

When a MAC address is updated in batadv_dat_entry_add(), it is done using a
simple copy function. A parallel reader might only see parts of this
update. In worst case, the reader is transporting the half updated MAC
address over the network or is creating an ARP response using it -
poisoning the ARP cache.

atomic64_t can be used to store the 48 bit of a mac address. A reader will
then either see the old mac address or the new one - never a mixture of
both.

## Remediation

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