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CVE-2026-23266
medium
CVSS 5.5
Vulnerability in Kernel (CVE-2026-23266)
Summary
vulnerability in Kernel (CVE-2026-23266). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to `5.10.251, 5.15.201, 6.1.164, 6.6.127, 6.12.74, 6.18.13, 6.19.3` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-23266** has been found in Kernel.
Risk of unauthorized operations or information disclosure. CVSS score: 5.5/10.
What to do: upgrade Kernel to **5.10.251, 5.15.201, 6.1.164, 6.6.127, 6.12.74, 6.18.13, 6.19.3** or later.
If unsure, ask your IT team or search "Kernel CVE-2026-23266" on the vendor's site.
CVE-2026-23266 (Kernel) — CWE-369 / CVSS v3 5.5
Attack vector: local / no user interaction
Patched: `5.10.251, 5.15.201, 6.1.164, 6.6.127, 6.12.74, 6.18.13, 6.19.3` — 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-369) 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 **5.10.251, 5.15.201, 6.1.164, 6.6.127, 6.12.74, 6.18.13, 6.19.3**.
🛡️ 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 5.10.251, 5.15.201, 6.1.164, 6.6.127, 6.12.74, 6.18.13, 6.19.3ステージング環境で 5.10.251, 5.15.201, 6.1.164, 6.6.127, 6.12.74, 6.18.13, 6.19.3 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":"2.6.12"},{"fixed":"5.10.251"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.201"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.164"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.127"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.74"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.13"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.3"}]}]
References
- advisory https://nvd.nist.gov/vuln/detail/CVE-2026-23266
- advisory https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23266.json
- package https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- web https://git.kernel.org/stable/c/0209e21e3c372fa2da04c39214bec0b64e4eb5f4
- web https://git.kernel.org/stable/c/3e4cbd1d46c246dfa684c8e9d8c20ae0b960c50a
- web https://git.kernel.org/stable/c/526460a96c5443e2fc0fd231edd1f9c49d2de26b
- web https://git.kernel.org/stable/c/52916878db2b8e3769743a94484729f0844352df
- web https://git.kernel.org/stable/c/73f0391e92d404da68f7484e57c106c5e673dc7e
- web https://git.kernel.org/stable/c/78daf5984d96edec3b920c72a93bd6821b8710b7
- web https://git.kernel.org/stable/c/9efa0dc46270a8723c158c64afbcf1dead72b28c
- web https://git.kernel.org/stable/c/ec5a58f4fd581875593ea92a65485e1906a53c0f
- web https://github.com/advisories/GHSA-c589-8xvr-7cm3