linux-cve-announce - CVE-2025-39812: sctp: initialize more fields in sctp_v6_from

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Message-ID: <2025091614-CVE-2025-39812-8a89@gregkh>
Date: Tue, 16 Sep 2025 15:00:18 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-39812: sctp: initialize more fields in sctp_v6_from_sk()

From: Greg Kroah-Hartman <gregkh@...nel.org>

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/generated/asm/syscalls_64.h:51
  do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
  do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Local variable addr.i.i created at:
  sctp_get_port net/sctp/socket.c:8515 [inline]
  sctp_listen_start net/sctp/socket.c:8567 [inline]
  sctp_inet_listen+0x650/0xfd0 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

The Linux kernel CVE team has assigned CVE-2025-39812 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 5.4.298 with commit 45e4b36593edffb7bbee5828ae820bc10a9fa0f3
	Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 5.10.242 with commit 9546934c2054bba1bd605c44e936619159a34027
	Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 5.15.191 with commit 17d6c7747045e9b802c2f5dfaba260d309d831ae
	Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.1.150 with commit 65b4693d8bab5370cfcb44a275b4d8dcb06e56bf
	Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.6.104 with commit 463aa96fca6209bb205f49f7deea3817d7ddaa3a
	Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.12.45 with commit 1bbc0c02aea1f1c405bd1271466889c25a1fe01b
	Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.16.5 with commit f6c2cc99fc2387ba6499facd6108f6543382792d
	Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.17-rc4 with commit 2e8750469242cad8f01f320131fd5a6f540dbb99

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2025-39812
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	net/sctp/ipv6.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/45e4b36593edffb7bbee5828ae820bc10a9fa0f3
	https://git.kernel.org/stable/c/9546934c2054bba1bd605c44e936619159a34027
	https://git.kernel.org/stable/c/17d6c7747045e9b802c2f5dfaba260d309d831ae
	https://git.kernel.org/stable/c/65b4693d8bab5370cfcb44a275b4d8dcb06e56bf
	https://git.kernel.org/stable/c/463aa96fca6209bb205f49f7deea3817d7ddaa3a
	https://git.kernel.org/stable/c/1bbc0c02aea1f1c405bd1271466889c25a1fe01b
	https://git.kernel.org/stable/c/f6c2cc99fc2387ba6499facd6108f6543382792d
	https://git.kernel.org/stable/c/2e8750469242cad8f01f320131fd5a6f540dbb99