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CVE-2026-31533
critical
CVSS 9.8
Use-After-Free in linux (CVE-2026-31533)
Summary
vulnerability in linux (CVE-2026-31533). Successful exploitation can lead to full system takeover.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-31533** has been found in linux.
Successful exploitation can lead to full system takeover. CVSS score: 9.8/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "linux CVE-2026-31533" on the vendor's site.
CVE-2026-31533 (linux) — CWE-416 / CVSS v3 9.8
Attack vector: remote (network-reachable) / unauthenticated / 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
**use-after-free** (CWE-416) exists in linux.
📍 Affected scope
linux — .
🔥 Severity
Severity: Critical (CVSS 9.8/10). 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/02f3ecadb23558bbe068e6504118f1b712d4ece0
- web https://git.kernel.org/stable/c/0e43e0a3c94044acc74b8e0927c27972eb5a59e8
- web https://git.kernel.org/stable/c/2694d408b0e595024e0fc1d64ff9db0358580f74
- web https://git.kernel.org/stable/c/414fc5e5a5aff776c150f1b86770e0a25a35df3a
- web https://git.kernel.org/stable/c/5d70eb25b41e9b010828cd12818b06a0c3b04412
- web https://git.kernel.org/stable/c/a9b8b18364fffce4c451e6f6fd218fa4ab646705
- web https://git.kernel.org/stable/c/aa9facde6c5005205874c37db3fd25799d741baf
- web https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- web https://cert-portal.siemens.com/productcert/html/ssa-082556.html
- web https://nvd.nist.gov/vuln/detail/CVE-2026-31533
- web https://github.com/advisories/GHSA-r7wv-m72q-8qj8