CVE-2025-38112
Linux Kernel Null Pointer Dereference in Net 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.
INFO
Published Date :
July 3, 2025, 9:15 a.m.
Last Modified :
July 3, 2025, 3:13 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
Exploitability Score :
References to Advisories, Solutions, and Tools
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CVE-2025-38112.
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The following table lists the changes that have been made to the
CVE-2025-38112 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 03, 2025
Action Type Old Value New Value Added 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. Added Reference https://git.kernel.org/stable/c/1b367ba2f94251822577daed031d6b9a9e11ba91 Added Reference https://git.kernel.org/stable/c/1e0de7582ceccbdbb227d4e0ddf65732f92526da Added Reference https://git.kernel.org/stable/c/2660a544fdc0940bba15f70508a46cf9a6491230 Added Reference https://git.kernel.org/stable/c/6fa68d7eab34d448a61aa24ea31e68b3231ed20d Added Reference https://git.kernel.org/stable/c/8926a7ef1977a832dd6bf702f1a99303dbf15b15 Added Reference https://git.kernel.org/stable/c/c2b26638476baee154920bb587fc94ff1bf04336 Added Reference https://git.kernel.org/stable/c/ff55c85a923e043d59d26b20a673a1b4a219c310
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-38112 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-38112
weaknesses.