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CVE-2025-21826
medium
CVSS 5.5
Vulnerability in linux (CVE-2025-21826)
Summary
vulnerability in linux (CVE-2025-21826). Risk of unauthorized operations or information disclosure.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2025-21826** has been found in linux.
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 CVE-2025-21826" on the vendor's site.
CVE-2025-21826 (linux) — 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** (unclassified) exists in linux.
📍 Affected scope
linux — .
🔥 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. 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/1b9335a8000fb70742f7db10af314104b6ace220
- web https://git.kernel.org/stable/c/2ac254343d3cf228ae0738b2615fedf85d000752
- web https://git.kernel.org/stable/c/49b7182b97bafbd5645414aff054b4a65d05823d
- web https://git.kernel.org/stable/c/5083a7ae45003456c253e981b30a43f71230b4a3
- web https://git.kernel.org/stable/c/6b467c8feac759f4c5c86d708beca2aa2b29584f
- web https://git.kernel.org/stable/c/82e491e085719068179ff6a5466b7387cc4bbf32
- web https://git.kernel.org/stable/c/ab50d0eff4a939d20c37721fd9766347efcdb6f6
- web https://lists.debian.org/debian-lts-announce/2025/03/msg00028.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-2025-21826
- web https://github.com/advisories/GHSA-8376-779w-5hcf