CVE-2025-39812

/// Technical description

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

sctp: initialize more fields in sctp_v6_from_sk()

syzbot found that sin6_scope_id was not properly initialized,

leading to undefined behavior.

Clear sin6_scope_id and sin6_flowinfo.

BUG: KMSAN: uninit-value in __sctp_v6_cmp_addr+0x887/0x8c0 net/sctp/ipv6.c:649

__sctp_v6_cmp_addr+0x887/0x8c0 net/sctp/ipv6.c:649

sctp_inet6_cmp_addr+0x4f2/0x510 net/sctp/ipv6.c:983

sctp_bind_addr_conflict+0x22a/0x3b0 net/sctp/bind_addr.c:390

sctp_get_port_local+0x21eb/0x2440 net/sctp/socket.c:8452

sctp_get_port net/sctp/socket.c:8523 [inline]

sctp_listen_start net/sctp/socket.c:8567 [inline]

sctp_inet_listen+0x710/0xfd0 net/sctp/socket.c:8636

__sys_listen_socket net/socket.c:1912 [inline]

__sys_listen net/socket.c:1927 [inline]

__do_sys_listen net/socket.c:1932 [inline]

__se_sys_listen net/socket.c:1930 [inline]

__x64_sys_listen+0x343/0x4c0 net/socket.c:1930

x64_sys_call+0x271d/0x3e20 arch/x86/include/generate

/// 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