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CVE-2025-39841
high
CVSS 7.8
Out-of-Bounds Write in linux (CVE-2025-39841)
Summary
out-of-bounds write in linux (CVE-2025-39841). Successful exploitation can lead to full system takeover.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2025-39841** has been found in linux.
Successful exploitation can lead to full system takeover. CVSS score: 7.8/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "linux CVE-2025-39841" on the vendor's site.
CVE-2025-39841 (linux) — CWE-787 / CVSS v3 7.8
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
**out-of-bounds write** (CWE-787) exists in linux.
📍 Affected scope
linux — .
🔥 Severity
Severity: High (CVSS 7.8/10). Successful exploitation can lead to full system takeover
🔧 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. Run `grep -r 'linux' .` against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response Actions (7 steps)
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'linux' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で `linux` を grep し、稼働しているサービス・バージョンを把握する。
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7Post-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 Step 3 と同じログクエリでアラート再発が無いか継続監視。
References
- web https://git.kernel.org/stable/c/367cb5ffd8a8a4c85dc89f55e7fa7cc191425b11
- web https://git.kernel.org/stable/c/55658c7501467ca9ef3bd4453dd920010db8bc13
- web https://git.kernel.org/stable/c/897f64b01c1249ac730329b83f4f40bab71e86c7
- web https://git.kernel.org/stable/c/95b63d15fce5c54a73bbf195e1aacb5a75b128e2
- web https://git.kernel.org/stable/c/9dba9a45c348e8460da97c450cddf70b2056deb3
- web https://git.kernel.org/stable/c/ab34084f42ee06a9028d67c78feafb911d33d111
- web https://git.kernel.org/stable/c/baa39f6ad79d372a6ce0aa639fbb2f1578479f57
- web https://git.kernel.org/stable/c/d96cc9a1b57725930c60b607423759d563b4d900
- web https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
- web https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
- web https://cert-portal.siemens.com/productcert/html/ssa-032379.html
- web https://cert-portal.siemens.com/productcert/html/ssa-089022.html
- web https://nvd.nist.gov/vuln/detail/CVE-2025-39841
- web https://github.com/advisories/GHSA-j8p6-qx4r-877v