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CVE-2025-21772
high
CVSS 7.8
Out-of-Bounds Write in linux (CVE-2025-21772)
Summary
out-of-bounds write in linux (CVE-2025-21772). Successful exploitation can lead to full system takeover.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2025-21772** has been found in linux.
Successful exploitation can lead to full system takeover. CVSS score: 7.8/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "linux CVE-2025-21772" on the vendor's site.
CVE-2025-21772 (linux) — CWE-787 / CVSS v3 7.8
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 write** (CWE-787) exists in linux.
📍 Affected scope
linux — .
🔥 Severity
Severity: High (CVSS 7.8/10). Successful exploitation can lead to full system takeover
🔧 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
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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/213ba5bd81b7e97ac6e6190b8f3bc6ba76123625
- web https://git.kernel.org/stable/c/27a39d006f85e869be68c1d5d2ce05e5d6445bf5
- web https://git.kernel.org/stable/c/40a35d14f3c0dc72b689061ec72fc9b193f37d1f
- web https://git.kernel.org/stable/c/6578717ebca91678131d2b1f4ba4258e60536e9f
- web https://git.kernel.org/stable/c/7fa9706722882f634090bfc9af642bf9ed719e27
- web https://git.kernel.org/stable/c/80e648042e512d5a767da251d44132553fe04ae0
- web https://git.kernel.org/stable/c/92527100be38ede924768f4277450dfe8a40e16b
- web https://git.kernel.org/stable/c/a3e77da9f843e4ab93917d30c314f0283e28c124
- 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://nvd.nist.gov/vuln/detail/CVE-2025-21772
- web https://github.com/advisories/GHSA-rwf4-wmp4-834q