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CVE-2026-31504
high
CVSS 7.8
Use-After-Free in linux (CVE-2026-31504)
Summary
vulnerability in linux (CVE-2026-31504). Successful exploitation can lead to full system takeover. Exploitable via ``NETDEV_UP``.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-31504** has been found in linux.
Attackers can target a specific entry point like ``NETDEV_UP`` over the network to misuse the product.
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-2026-31504" on the vendor's site.
CVE-2026-31504 (linux) — CWE-416 / CVSS v3 7.8
Attack vector: local / no user interaction
Attack surface: `NETDEV_UP` / `bind_lock` / `sklist` / `packet_release`
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. Attackers reach the vulnerable code path via ``NETDEV_UP`` without authentication.
📍 Affected scope
linux — . Attack surface: `NETDEV_UP` / `bind_lock` / `sklist` / `packet_release`.
🔥 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
-
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。
-
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/1b4c03f8892d955385c202009af7485364731bb9
- web https://git.kernel.org/stable/c/42156f93d123436f2a27c468f18c966b7e5db796
- web https://git.kernel.org/stable/c/42cfd7898eeed290c9fb73f732af1f7d6b0a703e
- web https://git.kernel.org/stable/c/654386baef228c2992dbf604c819e4c7c35fc71b
- web https://git.kernel.org/stable/c/75fe6db23705a1d55160081f7b37db9665b1880b
- web https://git.kernel.org/stable/c/ceccbfc6de720ad633519a226715989cfb065af1
- web https://git.kernel.org/stable/c/d0c7cdc15fdf8c4f91aca1928e52295d175b6ec6
- web https://git.kernel.org/stable/c/ee642b1962caa9aa231c01abbd58bc453ae6b66e
- web https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- web https://cert-portal.siemens.com/productcert/html/ssa-082556.html
- web https://nvd.nist.gov/vuln/detail/CVE-2026-31504
- web https://github.com/advisories/GHSA-5v9p-3rfc-6rw2