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CVE-2026-43027
high
CVSS 7.8
Use-After-Free in linux (CVE-2026-43027)
Summary
vulnerability in linux (CVE-2026-43027). Successful exploitation can lead to full system takeover.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-43027** 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-2026-43027" on the vendor's site.
CVE-2026-43027 (linux) — CWE-416 / 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
**use-after-free** (CWE-416) 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/2c16e4d64dd91227742dfe196a3e7b0568bef65a
- web https://git.kernel.org/stable/c/2cf2737c85a2ba2b52024dafe68ffad2676f97be
- web https://git.kernel.org/stable/c/504ba4168466c91210c45acdc332479cfd5f2da6
- web https://git.kernel.org/stable/c/5cf28d5c8dcbbe8af6d3b145babe491906d7bad1
- web https://git.kernel.org/stable/c/620f3d14c1ef51d425060a3056ad8dbae8f998a3
- web https://git.kernel.org/stable/c/90bd7e8501349db3006d21fbc09df9ffcb172965
- web https://git.kernel.org/stable/c/a242a9ae58aa46ff7dae51ce64150a93957abe65
- web https://git.kernel.org/stable/c/dc1739eff48e34cc71d4e2f03715493fbcebd8af
- web https://nvd.nist.gov/vuln/detail/CVE-2026-43027
- web https://github.com/advisories/GHSA-f42g-qv35-qm2v