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CVE-2025-21859
medium
CVSS 5.5
Vulnerability in linux (CVE-2025-21859)
Summary
vulnerability in linux (CVE-2025-21859). Risk of unauthorized operations or information disclosure.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2025-21859** 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-2025-21859" on the vendor's site.
CVE-2025-21859 (linux) — CWE-667 / 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** (CWE-667) 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/1f10923404705a94891e612dff3b75e828a78368
- web https://git.kernel.org/stable/c/24a942610ee9bafb2692a456ae850c5b2e409b05
- web https://git.kernel.org/stable/c/4ab37fcb42832cdd3e9d5e50653285ca84d6686f
- web https://git.kernel.org/stable/c/727dee0857946b85232526de4f5a957fe163e89a
- web https://git.kernel.org/stable/c/8aa6b4be1f4efccbfc533e6ec8841d26e4fa8dba
- web https://git.kernel.org/stable/c/b09957657d7767d164b3432af2129bd72947553c
- web https://git.kernel.org/stable/c/deeee3adb2c01eedab32c3b4519337689ad02e8a
- web https://git.kernel.org/stable/c/e9fec6f42c45db2f62dc373fb1a10d2488c04e79
- 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-265688.html
- web https://nvd.nist.gov/vuln/detail/CVE-2025-21859
- web https://github.com/advisories/GHSA-r5hj-8p6x-9rq8