---
id: CVE-2026-23442
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ipv6: add NULL checks for idev in SRv6 paths

  __in6_dev_get() can return NULL when the device has no IPv6 configuration
  (e.g
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ipv6: add NULL checks for idev in SRv6 paths

  __in6_dev_get() can return NULL when the device has no IPv6 configuration
  (e.g. MTU < IPV6_MIN_MTU or after NETDEV_UNREGIS…
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-476
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 4.10.1, < 6.12.83'
  - 'linux_kernel >= 6.13, < 6.19.10'
  - linux_kernel = 4.10
  - linux_kernel = 7.0
patched:
  - linux_kernel 6.19.10
published: '2026-04-03'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T02:18:56.993'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-23442'
references:
  - url: 'https://git.kernel.org/stable/c/0348fa0ada37cef7c6b5ab2a428bb2c6aee784e4'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/06413793526251870e20402c39930804f14d59c0'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/50352fc103928e10e8729abc79a0d05abef26c4d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/83d705d35e583cb1b1eacf196dfe7b77d442018e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a25853c9feea7bbf31d157ff6e004d2d3b4f7f13'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/bc9843c39f9932a8b36efd1d362ea00bb88e4e78'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c5cedee5d97382176573bbe21e1724e737a5eb64'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d1bd8b9edc6752d10f84d28ff64f842401ce336d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-784472.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
  - cve.org
epss: 0.00123
epssPercentile: 0.01832
ingestedAt: '2026-10-15T03:30:12.849Z'
---

## Overview

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

ipv6: add NULL checks for idev in SRv6 paths

__in6_dev_get() can return NULL when the device has no IPv6 configuration
(e.g. MTU < IPV6_MIN_MTU or after NETDEV_UNREGISTER).

Add NULL checks for idev returned by __in6_dev_get() in both
seg6_hmac_validate_skb() and ipv6_srh_rcv() to prevent potential NULL
pointer dereferences.

## Affected

- `linux_kernel >= 4.10.1, < 6.12.83`
- `linux_kernel >= 6.13, < 6.19.10`
- `linux_kernel = 4.10`
- `linux_kernel = 7.0`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.19.10`