Vulnerability in linux-azure-fips (USN-7939-2)

Summary

vulnerability in linux-azure-fips (USN-7939-2). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to `5.4.0-1157.164+fips1` or later.

AI summary snake-internal / snake-material-v2

A vulnerability tracked as **USN-7939-2** has been found in linux-azure-fips. Risk of unauthorized operations or information disclosure. CVSS score: ?/10. What to do: upgrade linux-azure-fips to **5.4.0-1157.164+fips1** or later. If unsure, ask your IT team or search "linux-azure-fips USN-7939-2" on the vendor's site.

USN-7939-2 (linux-azure-fips) — Patched: `5.4.0-1157.164+fips1` — apply immediately 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-azure-fips.

📍 Affected scope

linux-azure-fips — .

🔥 Severity

Severity: ?. Risk of unauthorized operations or information disclosure

🔧 How to fix

Update to **5.4.0-1157.164+fips1**.

🛡️ 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-azure-fips' .` 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

1
Identify exposure identify
```
grep -r 'linux-azure-fips' . | 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-azure-fips` を grep し、稼働しているサービス・バージョンを把握する。
6
Apply patch patch
```
Upgrade linux-azure-fips to 5.4.0-1157.164+fips1
```
ステージング環境で 5.4.0-1157.164+fips1 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスと、Step 3 で見つけた異常検知の続報チェックを含めること。
7
Post-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。

Affected packages

Ubuntu:Pro:FIPS-updates:20.04:LTS linux-azure-fips

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.4.0-1157.164+fips1"}]}]

References

advisory https://ubuntu.com/security/notices/USN-7939-2
report https://ubuntu.com/security/CVE-2022-49026
report https://ubuntu.com/security/CVE-2022-49390
report https://ubuntu.com/security/CVE-2023-52854
report https://ubuntu.com/security/CVE-2024-35867
report https://ubuntu.com/security/CVE-2024-47691
report https://ubuntu.com/security/CVE-2024-49935
report https://ubuntu.com/security/CVE-2024-50061
report https://ubuntu.com/security/CVE-2024-50067
report https://ubuntu.com/security/CVE-2024-50095
report https://ubuntu.com/security/CVE-2024-50196
report https://ubuntu.com/security/CVE-2024-53090
report https://ubuntu.com/security/CVE-2024-53218
report https://ubuntu.com/security/CVE-2024-56664
report https://ubuntu.com/security/CVE-2025-21727
report https://ubuntu.com/security/CVE-2025-21855
report https://ubuntu.com/security/CVE-2025-37838
report https://ubuntu.com/security/CVE-2025-37958
report https://ubuntu.com/security/CVE-2025-38352
report https://ubuntu.com/security/CVE-2025-38666
report https://ubuntu.com/security/CVE-2025-39964
report https://ubuntu.com/security/CVE-2025-39993
report https://ubuntu.com/security/CVE-2025-40018
report https://ubuntu.com/security/CVE-2025-40300