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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
8934ce2fd08171e8605f7fada91ee7619fe17ab8 to < c2b26638476baee154920bb587fc94ff1bf04336affected8934ce2fd08171e8605f7fada91ee7619fe17ab8 to < 6fa68d7eab34d448a61aa24ea31e68b3231ed20daffected8934ce2fd08171e8605f7fada91ee7619fe17ab8 to < 8926a7ef1977a832dd6bf702f1a99303dbf15b15affected8934ce2fd08171e8605f7fada91ee7619fe17ab8 to < ff55c85a923e043d59d26b20a673a1b4a219c310affected8934ce2fd08171e8605f7fada91ee7619fe17ab8 to < 1e0de7582ceccbdbb227d4e0ddf65732f92526daaffected8934ce2fd08171e8605f7fada91ee7619fe17ab8 to < 1b367ba2f94251822577daed031d6b9a9e11ba91affected8934ce2fd08171e8605f7fada91ee7619fe17ab8 to < 2660a544fdc0940bba15f70508a46cf9a6491230affected
Linux Linux
Default version status: affected
4.17affected0 to < 4.17unaffected5.10.239 to ≤ 5.10.*unaffected5.15.186 to ≤ 5.15.*unaffected6.1.142 to ≤ 6.1.*unaffected6.6.94 to ≤ 6.6.*unaffected6.12.34 to ≤ 6.12.*unaffected6.15.3 to ≤ 6.15.*unaffected6.16 to ≤ *unaffected
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 ↗
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html ↗
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html ↗