---
id: CVE-2026-93286
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net: appletalk: fix NULL pointer dereference in aarp_send_ddp()

  aarp_send_ddp() calls atalk_find_dev_addr(dev) in the LocalTalk fast
  path without checking for NULL
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net: appletalk: fix NULL pointer dereference in aarp_send_ddp()

  aarp_send_ddp() calls atalk_find_dev_addr(dev) in the LocalTalk fast
  path without checking for NULL. Wh…
severity: medium
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    51cc5e756cec6071ffc620076aebcf5bae936668
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    8c4b9ceb1be780588c1c50d573d5ee308e0874d2
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    d643fd42ad96f19b5ce5cb11824fefa617191dbe
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    542c1dd41e1b0cd1c2c3ba8091c7d882eea0d680
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    8fc30f0cdf4207a5aa2341c0a98d0f1713b3ce2c
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    83899a056aeb120898a6e3a989971fc63e274e2e
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    9e7f36ab5b7bf68463faa5f7b926fea8f35597bb
  - Linux 2.6.12
published: '2026-09-24'
updated: '2026-10-03'
sourceUpdated: '2026-10-03T11:17:47.133'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93286'
references:
  - url: 'https://git.kernel.org/stable/c/51cc5e756cec6071ffc620076aebcf5bae936668'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/542c1dd41e1b0cd1c2c3ba8091c7d882eea0d680'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/83899a056aeb120898a6e3a989971fc63e274e2e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/8c4b9ceb1be780588c1c50d573d5ee308e0874d2'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/8fc30f0cdf4207a5aa2341c0a98d0f1713b3ce2c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/9e7f36ab5b7bf68463faa5f7b926fea8f35597bb'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d643fd42ad96f19b5ce5cb11824fefa617191dbe'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93286.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-93286'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2540516'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-93286'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93286'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-93286.mbox
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00173
epssPercentile: 0.06649
ingestedAt: '2026-09-24T16:47:15.905Z'
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-476
---

## Overview

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

net: appletalk: fix NULL pointer dereference in aarp_send_ddp()

aarp_send_ddp() calls atalk_find_dev_addr(dev) in the LocalTalk fast
path without checking for NULL. When the device has no AppleTalk
interface configured (dev->atalk_ptr == NULL), this leads to a NULL
pointer dereference at the at->s_net access.

 KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
 RIP: 0010:aarp_send_ddp (net/appletalk/aarp.c:552 (discriminator 2))
 Call Trace:
  <TASK>
  atalk_sendmsg (net/appletalk/ddp.c:1715)
  __sys_sendto (net/socket.c:2265 (discriminator 1))
  __x64_sys_sendto (net/socket.c:2272)
  do_syscall_64 (arch/x86/entry/syscall_64.c:94)
  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)

Add a NULL check consistent with the other callers of
atalk_find_dev_addr().

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 6 · updated 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93286.json)