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CVE-2025-37756

Description

In the Linux kernel, the following vulnerability has been resolved:net: tls: explicitly disallow disconnectsyzbot discovered that it can disconnect a TLS socket and thenrun into all sort of unexpected corner cases. I have a vaguerecollection of Eric pointing this out to us a long time ago.Supporting disconnect is really hard, for one thing if offloadis enabled we'd need to wait for all packets to be _acked_.Disconnect is not commonly used, disallow it.The immediate problem syzbot run into is the warning in the strp,but that's just the easiest bug to trigger: WARNING: CPU: 0 PID: 5834 at net/tls/tls_strp.c:486 tls_strp_msg_load+0x72e/0xa80 net/tls/tls_strp.c:486 RIP: 0010:tls_strp_msg_load+0x72e/0xa80 net/tls/tls_strp.c:486 Call Trace: tls_rx_rec_wait+0x280/0xa60 net/tls/tls_sw.c:1363 tls_sw_recvmsg+0x85c/0x1c30 net/tls/tls_sw.c:2043 inet6_recvmsg+0x2c9/0x730 net/ipv6/af_inet6.c:678 sock_recvmsg_nosec net/socket.c:1023 [inline] sock_recvmsg+0x109/0x280 net/socket.c:1045 __sys_recvfrom+0x202/0x380 net/socket.c:2237

POC

Reference

No PoCs from references.

Github

- https://github.com/ARPSyndicate/cve-scores

- https://github.com/w4zu/Debian_security

- https://github.com/xairy/linux-kernel-exploitation