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[lts8_6] CVE-2025-39955 and CVE-2025-40186 #804

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Merged
roxanan1996 merged 2 commits into from
Jan 12, 2026
Merged

[lts8_6] CVE-2025-39955 and CVE-2025-40186 #804

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15a3c8c
tcp: Clear tcp_sk(sk)->fastopen_rsk in tcp_disconnect().
roxanan1996 Jan 6, 2026
c4be971
tcp: Don't call reqsk_fastopen_remove() in tcp_conn_request().
roxanan1996 Jan 6, 2026
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5 changes: 5 additions & 0 deletions net/ipv4/tcp.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2594,6 +2594,7 @@ int tcp_disconnect(struct sock *sk, int flags)
struct tcp_sock *tp = tcp_sk(sk);
int err = 0;
int old_state = sk->sk_state;
struct request_sock *req;
u32 seq;

if (old_state != TCP_CLOSE)
Expand Down Expand Up @@ -2698,6 +2699,10 @@ int tcp_disconnect(struct sock *sk, int flags)


/* Clean up fastopen related fields */
req = rcu_dereference_protected(tp->fastopen_rsk,
lockdep_sock_is_held(sk));
if (req)
reqsk_fastopen_remove(sk, req, false);
tcp_free_fastopen_req(tp);
inet->defer_connect = 0;

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1 change: 0 additions & 1 deletion net/ipv4/tcp_input.c
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Original file line number Diff line number Diff line change
Expand Up @@ -6746,7 +6746,6 @@ int tcp_conn_request(struct request_sock_ops *rsk_ops,
&foc, TCP_SYNACK_FASTOPEN, skb);
/* Add the child socket directly into the accept queue */
if (!inet_csk_reqsk_queue_add(sk, req, fastopen_sk)) {
reqsk_fastopen_remove(fastopen_sk, req, false);
bh_unlock_sock(fastopen_sk);
sock_put(fastopen_sk);
goto drop_and_free;
Expand Down