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CVE-2026-23399
medium
CVSS 5.5
Vulnerability in Kernel (CVE-2026-23399)
Summary
vulnerability in Kernel (CVE-2026-23399). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to `6.12.78, 6.18.20, 6.19.10` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-23399** has been found in Kernel.
Risk of unauthorized operations or information disclosure. CVSS score: 5.5/10.
What to do: upgrade Kernel to **6.12.78, 6.18.20, 6.19.10** or later.
If unsure, ask your IT team or search "Kernel CVE-2026-23399" on the vendor's site.
CVE-2026-23399 (Kernel) — CWE-401 / CVSS v3 5.5
Attack vector: local / no user interaction
Patched: `6.12.78, 6.18.20, 6.19.10` — 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-401) exists in Kernel.
📍 Affected scope
Kernel — .
🔥 Severity
Severity: Medium (CVSS 5.5/10). Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **6.12.78, 6.18.20, 6.19.10**.
🛡️ 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
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1Identify 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。
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6Apply patch patch
Upgrade Kernel to 6.12.78, 6.18.20, 6.19.10ステージング環境で 6.12.78, 6.18.20, 6.19.10 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。
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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。
Affected packages
Linux
Kernel
[{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"6.12.78"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.20"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.10"}]}]
References
- advisory https://nvd.nist.gov/vuln/detail/CVE-2026-23399
- advisory https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23399.json
- package https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- web https://git.kernel.org/stable/c/0548a13b5a145b16e4da0628b5936baf35f51b43
- web https://git.kernel.org/stable/c/31641c682db73353e4647e40735c7f2a75ff58ef
- web https://git.kernel.org/stable/c/4357dbb1d9c35ca0b4443d71c98a48e6666f7689
- web https://git.kernel.org/stable/c/c88a9fd26cee365bec932196f76175772a941cca
- web https://git.kernel.org/stable/c/d1354873cbe3b344899c4311ac05897fd83e3f21
- web https://git.kernel.org/stable/c/e6661add2d9c6913e1dad97336595e23a2bed195
- web https://git.kernel.org/stable/c/eb7bf413e59945df03d4567b73ce464eebe2f4ea
- web https://github.com/advisories/GHSA-vfh6-r892-92wv