CVE-2021-47591

In the Linux kernel, the following vulnerability has been resolved: mptcp: remove tcp ulp setsockopt support TCP_ULP setsockopt cannot be used for mptcp because its already used internally to plumb subflow (tcp) sockets to the mptcp layer. syzbot managed to trigger a crash for mptcp connections that are in fallback mode: KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027] CPU: 1 PID: 1083 Comm: syz-executor.3 Not tainted 5.16.0-rc2-syzkaller #0 RIP: 0010:tls_build_proto net/tls/tls_main.c:776 [inline] [..] __tcp_set_ulp net/ipv4/tcp_ulp.c:139 [inline] tcp_set_ulp+0x428/0x4c0 net/ipv4/tcp_ulp.c:160 do_tcp_setsockopt+0x455/0x37c0 net/ipv4/tcp.c:3391 mptcp_setsockopt+0x1b47/0x2400 net/mptcp/sockopt.c:638 Remove support for TCP_ULP setsockopt.

The following products are affected by CVE-2021-47591 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2021-47591.

URL	Resource
https://git.kernel.org/stable/c/3de0c86d42f841d1d64f316cd949e65c566f0734
https://git.kernel.org/stable/c/404cd9a22150f24acf23a8df2ad0c094ba379f57
https://lore.kernel.org/linux-cve-announce/2024061919-CVE-2021-47591-955a@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2021-47591
https://www.cve.org/CVERecord?id=CVE-2021-47591