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CVE-2026-53256
high
CVSS 8.0
Use-After-Free in linux (CVE-2026-53256)
Summary
vulnerability in linux (CVE-2026-53256). Successful exploitation can lead to full system takeover.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-53256** has been found in linux.
Successful exploitation can lead to full system takeover. CVSS score: 8.0/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "linux CVE-2026-53256" on the vendor's site.
CVE-2026-53256 (linux) — CWE-416 / CVSS v3 8.0
Attack vector: adjacent-network / 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 8.0/10). 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://nvd.nist.gov/vuln/detail/CVE-2026-53256
- web https://git.kernel.org/stable/c/1f73f92f66251065a5f39b09a47cf05ea14d3107
- web https://git.kernel.org/stable/c/43c441edacf953b39517a44f5e5e10a93618b226
- web https://git.kernel.org/stable/c/6f4462d12133106460d7c046b95aad2491e3fddf
- web https://git.kernel.org/stable/c/8802413ce63175fb522a2bd609fb043a3550c720
- web https://git.kernel.org/stable/c/a07d741c077d4e34b16458241a94d29039386553
- web https://git.kernel.org/stable/c/b0e33e409715c617e2a20f46f99aa5403a14dfda
- web https://git.kernel.org/stable/c/de31973ef00e5aa55496f84cf6a44bb157a34e02
- web https://git.kernel.org/stable/c/f5ec76bdbeb80f75ad0be204371afffee0f8fac8
- web https://github.com/advisories/GHSA-hq32-rppj-r4rv