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CVE-2026-43221
medium
CVSS 5.5
Vulnerability in linux (CVE-2026-43221)
Summary
vulnerability in linux (CVE-2026-43221). Risk of unauthorized operations or information disclosure.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-43221** has been found in linux.
Risk of unauthorized operations or information disclosure. CVSS score: 5.5/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "linux CVE-2026-43221" on the vendor's site.
CVE-2026-43221 (linux) — CWE-908 / CVSS v3 5.5
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
**A vulnerability** (CWE-908) exists in linux.
📍 Affected scope
linux — .
🔥 Severity
Severity: Medium (CVSS 5.5/10). Risk of unauthorized operations or information disclosure
🔧 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/102712417bb6aa9a00d852bc59cb0a276db486c4
- web https://git.kernel.org/stable/c/2dfbc8c17dd161885336e77e71c336cd62cf6748
- web https://git.kernel.org/stable/c/56d5c0557e53c4d8d92a619fa83eaae178165e07
- web https://git.kernel.org/stable/c/905554ebd76aeee370bfd5136ea11e0b9d75c6f1
- web https://git.kernel.org/stable/c/9f235ccecd03c436cb1683eac16b12f119e54aa9
- web https://git.kernel.org/stable/c/f726b3a57e00bb6249c67714c11ae8b4b31719a1
- web https://nvd.nist.gov/vuln/detail/CVE-2026-43221
- web https://github.com/advisories/GHSA-vqpg-cfxc-r52f