Vulnerability in Kernel (CVE-2023-54133)

Summary

Vulnerability in Kernel (CVE-2023-54133). Risk of unauthorized operations or information disclosure. Exploitable via __dev_mc_unsync. Mitigation: upgrade to 6.4.5 or later.

Original description

The description as published by the source.

In the Linux kernel, the following vulnerability has been resolved:

nfp: clean mc addresses in application firmware when closing port

When moving devices from one namespace to another, mc addresses are
cleaned in software while not removed from application firmware. Thus
the mc addresses are remained and will cause resource leak.

Now use __dev_mc_unsync to clean mc addresses when closing port.

Source: OSV.dev (Open Source Vulnerabilities) NVD OSV

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2023-54133 has been found in Kernel.
Attackers can target a specific entry point like __dev_mc_unsync over the network to misuse the product.
Risk of unauthorized operations or information disclosure.
What to do: upgrade Kernel to 6.4.5 or later.
If unsure, ask your IT team or search "Kernel CVE-2023-54133" on the vendor's site.

CVE-2023-54133 (Kernel)
Attack surface: __dev_mc_unsync
Patched: 6.4.5 — 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 Kernel. Attackers reach the vulnerable code path via __dev_mc_unsync.

📍 Affected scope

Check the vendor advisory for the affected versions of Kernel. Attack surface: __dev_mc_unsync.

🔥 Severity

Severity: ?. Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 6.4.5.

🛡️ 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 'Kernel' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

1
Identify exposure identify
```
grep -r 'Kernel' . | 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 Kernel を grep し、稼働しているサービス・バージョンを把握する。
2
Apply patch patch
```
Upgrade Kernel to 6.4.5
```
ステージング環境で 6.4.5 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を含めること。
3
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。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

Linux Kernel

[{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.4.5"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

Debian DEBIAN-CVE-2023-54133 linux Fixed in: 6.4.11-1