CVE-2025-22062

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

sctp: add mutual exclusion in proc_sctp_do_udp_port()

We must serialize calls to sctp_udp_sock_stop() and sctp_udp_sock_start()

or risk a crash as syzbot reported:

Oops: general protection fault, probably for non-canonical address 0xdffffc000000000d: 0000 [#1] SMP KASAN PTI

KASAN: null-ptr-deref in range [0x0000000000000068-0x000000000000006f]

CPU: 1 UID: 0 PID: 6551 Comm: syz.1.44 Not tainted 6.14.0-syzkaller-g7f2ff7b62617 #0 PREEMPT(full)

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025

RIP: 0010:kernel_sock_shutdown+0x47/0x70 net/socket.c:3653

Call Trace:

<TASK>

udp_tunnel_sock_release+0x68/0x80 net/ipv4/udp_tunnel_core.c:181

sctp_udp_sock_stop+0x71/0x160 net/sctp/protocol.c:930

proc_sctp_do_udp_port+0x264/0x450 net/sctp/sysctl.c:553

proc_sys_call_handler+0x3d0/0x5b0 fs/proc/proc_sysctl.c:601

iter_file_splice_write+0x91c/0x1150 fs/splice.c:738

do_splice_from

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References