CVE-2025-38112: debian linux — Fix

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.

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CVSS v3.1 Score

4.7

MEDIUM

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-367 CWE-367

Affected Products

Vendor	Product	Versions
linux	linux_kernel	4.17 — 5.10.239
linux	linux_kernel	5.11 — 5.15.186
linux	linux_kernel	5.16 — 6.1.142
linux	linux_kernel	6.2 — 6.6.94
linux	linux_kernel	6.7 — 6.12.34
linux	linux_kernel	6.13 — 6.15.3
linux	linux_kernel	All
debian	debian_linux	All

References

Advisories & Patches

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

Other References

https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html

Frequently Asked Questions

What is CVE-2025-38112? +

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. It has a CVSS v3.1 base score of 4.7 (MEDIUM).

How severe is CVE-2025-38112? +

CVE-2025-38112 has a CVSS v3.1 score of 4.7 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-38112? +

CVE-2025-38112 affects products from debian, linux, specifically: debian_linux, linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-38112? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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