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CVE-2025-39819
medium
CVSS 5.5
Vulnerability in linux (CVE-2025-39819)
Summary
vulnerability in linux (CVE-2025-39819). Risk of unauthorized operations or information disclosure. Exploitable via ``smb2_compound_op``.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2025-39819** has been found in linux.
Attackers can target a specific entry point like ``smb2_compound_op`` 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 "linux CVE-2025-39819" on the vendor's site.
CVE-2025-39819 (linux) — CVSS v3 5.5
Attack vector: local / no user interaction
Attack surface: `smb2_compound_op` / `cfile` / `vars` / `is_replayable_error`
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 linux. Attackers reach the vulnerable code path via ``smb2_compound_op`` without authentication.
📍 Affected scope
linux — . Attack surface: `smb2_compound_op` / `cfile` / `vars` / `is_replayable_error`.
🔥 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/3fc11ff13fbc2749871d6ac2141685cf54699997
- web https://git.kernel.org/stable/c/4191ea1f0bb3e27d65c5dcde7bd00e709ec67141
- web https://git.kernel.org/stable/c/4735f5991f51468b85affb8366b7067248457a71
- web https://git.kernel.org/stable/c/ab529e6ca1f67bcf31f3ea80c72bffde2e9e053e
- web https://git.kernel.org/stable/c/cc82c6dff548f0066a51a6e577c7454e7d26a968
- web https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
- web https://cert-portal.siemens.com/productcert/html/ssa-032379.html
- web https://nvd.nist.gov/vuln/detail/CVE-2025-39819
- web https://github.com/advisories/GHSA-96wc-h5c4-3f6j