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CVE-2025-39812 medium CVSS 5.5

Vulnerability in Linux kernel (CVE-2025-39812)

Summary

Vulnerability in Linux kernel (CVE-2025-39812). Risk of unauthorized operations or information disclosure.

Original description

The description as published by the source.

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 [i…

Source: NIST National Vulnerability Database NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2025-39812 has been found in Linux kernel.
Risk of unauthorized operations or information disclosure. CVSS score: 5.5/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "Linux kernel CVE-2025-39812" on the vendor's site.

CVE-2025-39812 (Linux kernel) — CWE-908 / CVSS v3 5.5
Attack vector: local / no user interaction
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (CWE-908) exists in Linux kernel.

📍 Affected scope

Check the vendor advisory for the affected versions of Linux kernel.

🔥 Severity

Severity: Medium (CVSS 5.5/10). Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to the patched release per vendor advisory.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    Audit SBOM/dependencies for affected components.

    資産台帳・SBOM・依存マニフェストで Linux kernel を使っているサービスとバージョンを洗い出す。

  2. 2
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

Linux Kernel
[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.12"},{"fixed":"5.4.298"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.5.0"},{"fixed":"5.10.242"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.191"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.150"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.104"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.45"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.16.5"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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