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CVE-2025-21647
high
CVSS 7.1
Out-of-Bounds Read in linux (CVE-2025-21647)
Summary
vulnerability in linux (CVE-2025-21647). Confidential information can be exposed externally.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2025-21647** has been found in linux.
Confidential information can be exposed externally. CVSS score: 7.1/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "linux CVE-2025-21647" on the vendor's site.
CVE-2025-21647 (linux) — CWE-125 / CVSS v3 7.1
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 read** (CWE-125) exists in linux.
📍 Affected scope
linux — .
🔥 Severity
Severity: High (CVSS 7.1/10). Confidential information can be exposed externally
🔧 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。
-
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/27202e2e8721c3b23831563c36ed5ac7818641ba
- web https://git.kernel.org/stable/c/44fe1efb4961c1a5ccab16bb579dfc6b308ad58b
- web https://git.kernel.org/stable/c/737d4d91d35b5f7fa5bb442651472277318b0bfd
- web https://git.kernel.org/stable/c/91bb18950b88f955838ec0c1d97f74d135756dc7
- web https://git.kernel.org/stable/c/a777e06dfc72bed73c05dcb437d7c27ad5f90f3f
- web https://git.kernel.org/stable/c/b1a1743aaa4906c41c426eda97e2e2586f79246d
- web https://git.kernel.org/stable/c/bb0245fa72b783cb23a9949c5048781341e91423
- web https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html
- web https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
- web https://cert-portal.siemens.com/productcert/html/ssa-265688.html
- web https://cert-portal.siemens.com/productcert/html/ssa-503939.html
- web https://nvd.nist.gov/vuln/detail/CVE-2025-21647
- web https://github.com/advisories/GHSA-j2g7-wj3p-j9c9