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CVE-2026-31415
medium
CVSS 5.5
Vulnerability in c (CVE-2026-31415)
Summary
vulnerability in c (CVE-2026-31415). Risk of unauthorized operations or information disclosure. Exploitable via ``__u16``.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-31415** has been found in c.
Attackers can target a specific entry point like ``__u16`` over the network to misuse the product.
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 "c CVE-2026-31415" on the vendor's site.
CVE-2026-31415 (c) — CWE-617 / CVSS v3 5.5
Attack vector: local / no user interaction
Attack surface: `__u16` / `IPV6_DSTOPTS` / `opt_flen` / `CAP_NET_RAW`
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-617) exists in c. Attackers reach the vulnerable code path via ``__u16`` without authentication.
📍 Affected scope
c — . Attack surface: `__u16` / `IPV6_DSTOPTS` / `opt_flen` / `CAP_NET_RAW`.
🔥 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 'c' .` 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 'c' . | 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 `c` 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/0bdaf54d3aaddfe8df29371260fa8d4939b4fd6f
- web https://git.kernel.org/stable/c/2dbfb003bbf3fc0e94f07efefab0ebcf83029a2a
- web https://git.kernel.org/stable/c/4082f9984a694829153115d28c956a3534f52f29
- web https://git.kernel.org/stable/c/4e453375561fc60820e6b9d8ebeb6b3ee177d42e
- web https://git.kernel.org/stable/c/5e4ee5dbea134e9257f205e31a96040bed71e83f
- web https://git.kernel.org/stable/c/63fda74885555e6bd1623b5d811feec998740ba4
- web https://git.kernel.org/stable/c/872b74900d5daa37067ac676d9001bb929fc6a2a
- web https://git.kernel.org/stable/c/9ed81d692758dfb9471d7799b24bfa7a08224c31
- web https://nvd.nist.gov/vuln/detail/CVE-2026-31415
- web https://github.com/advisories/GHSA-2rf4-5672-vqwm