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CVE-2026-43420
Vulnerability in c (CVE-2026-43420)
Summary
vulnerability in c (CVE-2026-43420). Risk of unauthorized operations or information disclosure. Exploitable via ``i_nlink``.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-43420** has been found in c.
Attackers can target a specific entry point like ``i_nlink`` over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: ?/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "c CVE-2026-43420" on the vendor's site.
CVE-2026-43420 (c) —
Attack surface: `i_nlink` / `ceph_inode_info.i_ceph_lock` / `inode.i_lock` / `afs_vnode.cb_lock`
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** (unclassified) exists in c. Attackers reach the vulnerable code path via ``i_nlink`` without authentication.
📍 Affected scope
c — . Attack surface: `i_nlink` / `ceph_inode_info.i_ceph_lock` / `inode.i_lock` / `afs_vnode.cb_lock`.
🔥 Severity
Severity: ?. 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/6d5fd8bb574bef039eb3b738e523870433a2aeb9
- web https://git.kernel.org/stable/c/7db008e85a5d17b64bc5390b828bf457ae91a415
- web https://git.kernel.org/stable/c/8975b85b0d45ca811ace6fac5907652f2310e5ac
- web https://git.kernel.org/stable/c/9b31e88ac5623d15c8bc46f69dfe1d3b43a8f67c
- web https://git.kernel.org/stable/c/aedd29386b23f3e1e6818943e11abfff2953732f
- web https://git.kernel.org/stable/c/b3f5513141ecc6b277a8f7b7efe58a0cf9a5e859
- web https://git.kernel.org/stable/c/ce0123cbb4a40a2f1bbb815f292b26e96088639f
- web https://git.kernel.org/stable/c/fcc477a6e8856c8a42b3c9e171724d8d6dfadd06
- web https://nvd.nist.gov/vuln/detail/CVE-2026-43420
- web https://github.com/advisories/GHSA-8frp-2m2w-wr4j