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CVE-2025-21728
medium
CVSS 5.5
Vulnerability in linux (CVE-2025-21728)
Summary
vulnerability in linux (CVE-2025-21728). Risk of unauthorized operations or information disclosure.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2025-21728** 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-2025-21728" on the vendor's site.
CVE-2025-21728 (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/092fc76b7ab4163e008f9cde596a58dad2108260
- web https://git.kernel.org/stable/c/78b97783496b454435639937db3303e900a24d3f
- web https://git.kernel.org/stable/c/87c544108b612512b254c8f79aa5c0a8546e2cc4
- web https://git.kernel.org/stable/c/be42a09fe898635b0093c0c8dac1bfabe225c240
- web https://git.kernel.org/stable/c/ce51eab2070e295d298f42a2f1db269cd1b56d55
- web https://git.kernel.org/stable/c/e306eaaa3d78b462db5f5b11e0171f9d2b6ca3f4
- web https://git.kernel.org/stable/c/eeef8e65041a031bd8a747a392c14b76a123a12c
- web https://git.kernel.org/stable/c/feba1308bc5e8e04cee751d39fae8a9b407a9034
- 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-082556.html
- web https://cert-portal.siemens.com/productcert/html/ssa-265688.html
- web https://nvd.nist.gov/vuln/detail/CVE-2025-21728
- web https://github.com/advisories/GHSA-f47w-fp34-vr9h