Use-after-free vulnerability in net/ipv4/tcp_input.c in the Linux
kernel 2.6 before 2.6.20, when IPV6_RECVPKTINFO is set on a listening
socket, allows remote attackers to cause a denial of service (kernel
panic) via a SYN packet while the socket is in a listening
(TCP_LISTEN) state, which is not properly handled and causes the skb
structure to be freed.
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