CVE-2025-38112

net: Fix TOCTOU issue in sk_is_readable()

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.

N/A

CVSS

Severity:

EPSS 0.02%

Affected: Linux Linux

References

Link	Tags
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

Frequently Asked Questions

What is the severity of CVE-2025-38112?: CVE-2025-38112 has not yet been assigned a CVSS score.
How to fix CVE-2025-38112?: To fix CVE-2025-38112, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-38112 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2025-38112 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-38112?: CVE-2025-38112 affects Linux Linux, Linux Linux.

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