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CVE-2026-23240 critical CVSS 9.8

Vulnerability in Kernel (CVE-2026-23240)

Summary

vulnerability in Kernel (CVE-2026-23240). Successful exploitation can lead to full system takeover. Mitigation: upgrade to `6.12.75, 6.18.16, 6.19.6` or later.

AI summary snake-internal / snake-material-v2

A vulnerability tracked as **CVE-2026-23240** has been found in Kernel. Successful exploitation can lead to full system takeover. CVSS score: 9.8/10. What to do: upgrade Kernel to **6.12.75, 6.18.16, 6.19.6** or later. If unsure, ask your IT team or search "Kernel CVE-2026-23240" on the vendor's site.
CVE-2026-23240 (Kernel) — CWE-362 / CVSS v3 9.8 Attack vector: remote (network-reachable) / unauthenticated / no user interaction Patched: `6.12.75, 6.18.16, 6.19.6` — apply immediately 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-362) exists in Kernel.
📍 Affected scope
Kernel — .
🔥 Severity
Severity: Critical (CVSS 9.8/10). Successful exploitation can lead to full system takeover
🔧 How to fix
Update to **6.12.75, 6.18.16, 6.19.6**.
🛡️ 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 'Kernel' .` 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

  1. 1
    Identify exposure identify 
    grep -r 'Kernel' . | 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 `Kernel` を grep し、稼働しているサービス・バージョンを把握する。

  2. 6
    Apply patch patch 
    Upgrade Kernel to 6.12.75, 6.18.16, 6.19.6

    ステージング環境で 6.12.75, 6.18.16, 6.19.6 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスと、Step 3 で見つけた異常検知の続報チェックを含めること。

  3. 7
    Post-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。

Affected packages

Linux Kernel
[{"type":"ECOSYSTEM","events":[{"introduced":"5.3.0"},{"fixed":"6.12.75"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.16"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.6"}]}]

References

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