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CVE-2025-21853
medium
CVSS 5.5
Vulnerability in linux (CVE-2025-21853)
Summary
vulnerability in linux (CVE-2025-21853). Risk of unauthorized operations or information disclosure.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2025-21853** 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-2025-21853" on the vendor's site.
CVE-2025-21853 (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。
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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/0d90d9e154144a3a80e9fc0eb9b21b7fc990f68f
- web https://git.kernel.org/stable/c/271e49f8a58edba65bc2b1250a0abaa98c4bfdbe
- web https://git.kernel.org/stable/c/29cfda62ab4d92ab94123813db49ab76c1e61b29
- web https://git.kernel.org/stable/c/2ce31c97c219b4fe797749f950274f246eb88c49
- web https://git.kernel.org/stable/c/4759acbd44d24a69b7b14848012ec4201d6c5501
- web https://git.kernel.org/stable/c/bc27c52eea189e8f7492d40739b7746d67b65beb
- web https://git.kernel.org/stable/c/d95607a5f2f9bb08194c9deaf4a5f3e8ba59a9d4
- web https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
- web https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html
- web https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- web https://nvd.nist.gov/vuln/detail/CVE-2025-21853
- web https://github.com/advisories/GHSA-xgr9-crfp-4qg4