Medium 5.5Published Sep 16, 2025

CVE-2025-39812sctp: initialize more fields in sctp_v6_from_sk()

Updated under an hour ago (Oct 28, 2026, 12:30 PM ET)

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It affects Linux and 3 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: May 12, 2026
First seen by InfoSec Signals: Oct 19, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 45e4b36593edffb7bbee5828ae820bc10a9fa0f3; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 9546934c2054bba1bd605c44e936619159a34027; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 17d6c7747045e9b802c2f5dfaba260d309d831ae; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 65b4693d8bab5370cfcb44a275b4d8dcb06e56bf; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 463aa96fca6209bb205f49f7deea3817d7ddaa3a; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 builds before 1bbc0c02aea1f1c405bd1271466889c25a1fe01b; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before f6c2cc99fc2387ba6499facd6108f6543382792d; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 2e8750469242cad8f01f320131fd5a6f540dbb99	CNA record
Siemens SIMATIC CN 4100 siemens:simatic_cn_4100 (from the name)	before V5.0	CISA ADP
linux linux_kernel linux:linux_kernel	from 2.6.12.1 before 5.4.298; from 5.5 before 5.10.242; from 5.11 before 5.15.191; from 5.16 before 6.1.150; from 6.2 before 6.6.104; from 6.7 before 6.12.45; from 6.13 before 6.16.5; 2.6.12; and 7 more ranges	NVD
debian debian_linux debian:debian_linux	11.0	NVD

References

References

https://git.kernel.org/stable/c/45e4b36593edffb7bbee5828ae820bc10a9fa0f3	patch
https://git.kernel.org/stable/c/9546934c2054bba1bd605c44e936619159a34027	patch
https://git.kernel.org/stable/c/17d6c7747045e9b802c2f5dfaba260d309d831ae	patch
https://git.kernel.org/stable/c/65b4693d8bab5370cfcb44a275b4d8dcb06e56bf	patch
https://git.kernel.org/stable/c/463aa96fca6209bb205f49f7deea3817d7ddaa3a	patch
https://git.kernel.org/stable/c/1bbc0c02aea1f1c405bd1271466889c25a1fe01b	patch
https://git.kernel.org/stable/c/f6c2cc99fc2387ba6499facd6108f6543382792d	patch
https://git.kernel.org/stable/c/2e8750469242cad8f01f320131fd5a6f540dbb99	patch
https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html	third-party-advisory
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html	third-party-advisory
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.