---
id: CVE-2026-97419
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  hsr: broadcast netlink notifications in the device's net namespace

  The HSR generic netlink family sets .netnsok = true
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  hsr: broadcast netlink notifications in the device's net namespace

  The HSR generic netlink family sets .netnsok = true. HSR devices can
  live in network namespaces othe…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    25b69f281cebe051a8e4ab19950a939c27ead1bc
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    24b3f1a9982c176d05a523a4bb9314dca0db4488
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    a762fabd7ef9a6cc07258684138f9c3f078d0326
  - Linux < 6.12.111
  - Linux < 6.18.53
  - Linux (all versions)
published: '2026-09-24'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T17:17:19.733'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-97419'
references:
  - url: 'https://git.kernel.org/stable/c/24b3f1a9982c176d05a523a4bb9314dca0db4488'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/25b69f281cebe051a8e4ab19950a939c27ead1bc'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a762fabd7ef9a6cc07258684138f9c3f078d0326'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-24T16:47:15.886Z'
---

## Overview

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

hsr: broadcast netlink notifications in the device's net namespace

The HSR generic netlink family sets .netnsok = true. HSR devices can
live in network namespaces other than init_net.

Two async notifiers broadcast events with genlmsg_multicast(). They
are hsr_nl_ringerror() and hsr_nl_nodedown(). That helper delivers
only on the default genl socket in init_net. So the events always land
in init_net. The network namespace of the device does not matter.

This has two effects. A listener in the device's own namespace never
sees its own ring error and node down events. A privileged listener in
init_net receives events from HSR devices in other namespaces. The
payload carries the peer node MAC (HSR_A_NODE_ADDR) and the slave port
ifindex (HSR_A_IFINDEX).

Switch both callers to genlmsg_multicast_netns(). Other families with
.netnsok = true already do this. Examples are gtp, ovpn, team,
batman-adv, netdev-genl, ethtool and handshake.

hsr_nl_ringerror() already has the slave port. It uses
dev_net(port->dev). hsr_nl_nodedown() takes the namespace from the
master port via hsr_port_get_hsr().

## Remediation

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