CVE-2025-39812
Full vulnerability record from the local CVENow database.
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
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-09-16 13:15:54.537000
Last modified
2026-10-19 21:10:00.160000
View original CVE JSON
{
"id": "CVE-2025-39812",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-09-16T13:15:54.537",
"lastModified": "2026-10-19T21:10:00.160",
"vulnStatus": "Modified",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: initialize more fields in sctp_v6_from_sk()\n\nsyzbot found that sin6_scope_id was not properly initialized,\nleading to undefined behavior.\n\nClear sin6_scope_id and sin6_flowinfo.\n\nBUG: KMSAN: uninit-value in __sctp_v6_cmp_addr+0x887/0x8c0 net/sctp/ipv6.c:649\n __sctp_v6_cmp_addr+0x887/0x8c0 net/sctp/ipv6.c:649\n sctp_inet6_cmp_addr+0x4f2/0x510 net/sctp/ipv6.c:983\n sctp_bind_addr_conflict+0x22a/0x3b0 net/sctp/bind_addr.c:390\n sctp_get_port_local+0x21eb/0x2440 net/sctp/socket.c:8452\n sctp_get_port net/sctp/socket.c:8523 [inline]\n sctp_listen_start net/sctp/socket.c:8567 [inline]\n sctp_inet_listen+0x710/0xfd0 net/sctp/socket.c:8636\n __sys_listen_socket net/socket.c:1912 [inline]\n __sys_listen net/socket.c:1927 [inline]\n __do_sys_listen net/socket.c:1932 [inline]\n __se_sys_listen net/socket.c:1930 [inline]\n __x64_sys_listen+0x343/0x4c0 net/socket.c:1930\n x64_sys_call+0x271d/0x3e20 arch/x86/include/generated/asm/syscalls_64.h:51\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nLocal variable addr.i.i created at:\n sctp_get_port net/sctp/socket.c:8515 [inline]\n sctp_listen_start net/sctp/socket.c:8567 [inline]\n sctp_inet_listen+0x650/0xfd0 net/sctp/socket.c:8636\n __sys_listen_socket net/socket.c:1912 [inline]\n __sys_listen net/socket.c:1927 [inline]\n __do_sys_listen net/socket.c:1932 [inline]\n __se_sys_listen net/socket.c:1930 [inline]\n __x64_sys_listen+0x343/0x4c0 net/socket.c:1930"
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nsctp: inicializar más campos en sctp_v6_from_sk()\n\nsyzbot encontró que sin6_scope_id no fue inicializado correctamente, lo que llevó a un comportamiento indefinido.\n\nLimpiar sin6_scope_id y sin6_flowinfo.\n\nERROR: KMSAN: valor no inicializado en __sctp_v6_cmp_addr+0x887/0x8c0 net/sctp/ipv6.c:649\n __sctp_v6_cmp_addr+0x887/0x8c0 net/sctp/ipv6.c:649\n sctp_inet6_cmp_addr+0x4f2/0x510 net/sctp/ipv6.c:983\n sctp_bind_addr_conflict+0x22a/0x3b0 net/sctp/bind_addr.c:390\n sctp_get_port_local+0x21eb/0x2440 net/sctp/socket.c:8452\n sctp_get_port net/sctp/socket.c:8523 [inline]\n sctp_listen_start net/sctp/socket.c:8567 [inline]\n sctp_inet_listen+0x710/0xfd0 net/sctp/socket.c:8636\n __sys_listen_socket net/socket.c:1912 [inline]\n __sys_listen net/socket.c:1927 [inline]\n __do_sys_listen net/socket.c:1932 [inline]\n __se_sys_listen net/socket.c:1930 [inline]\n __x64_sys_listen+0x343/0x4c0 net/socket.c:1930\n x64_sys_call+0x271d/0x3e20 arch/x86/include/generated/asm/syscalls_64.h:51\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nVariable local addr.i.i creada en:\n sctp_get_port net/sctp/socket.c:8515 [inline]\n sctp_listen_start net/sctp/socket.c:8567 [inline]\n sctp_inet_listen+0x650/0xfd0 net/sctp/socket.c:8636\n __sys_listen_socket net/socket.c:1912 [inline]\n __sys_listen net/socket.c:1927 [inline]\n __do_sys_listen net/socket.c:1932 [inline]\n __se_sys_listen net/socket.c:1930 [inline]\n __x64_sys_listen+0x343/0x4c0 net/socket.c:1930"
}
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{
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"source": "[email protected]",
"type": "Primary",
"cvssData": {
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"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"attackVector": "LOCAL",
"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 1.8,
"impactScore": 3.6
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Primary",
"description": [
{
"lang": "en",
"value": "CWE-908"
}
]
}
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