CVE-2025-38112
net: Fix TOCTOU issue in sk_is_readable()
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net: Fix TOCTOU issue in sk_is_readable()
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.
Reserved 2025-04-16 | Published 2025-07-03 | Updated 2025-07-03 | Assigner Linuxgit.kernel.org/...c/c2b26638476baee154920bb587fc94ff1bf04336
git.kernel.org/...c/6fa68d7eab34d448a61aa24ea31e68b3231ed20d
git.kernel.org/...c/8926a7ef1977a832dd6bf702f1a99303dbf15b15
git.kernel.org/...c/ff55c85a923e043d59d26b20a673a1b4a219c310
git.kernel.org/...c/1e0de7582ceccbdbb227d4e0ddf65732f92526da
git.kernel.org/...c/1b367ba2f94251822577daed031d6b9a9e11ba91
git.kernel.org/...c/2660a544fdc0940bba15f70508a46cf9a6491230
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