Vulnerability in Kernel (CVE-2023-54211)

Summary

Vulnerability in Kernel (CVE-2023-54211). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 4.14.322, 4.19.291, 5.4.253, 5.10.190, 5.15.124, 6.1.43, 6.4.8 or later.

Original description

The description as published by the source.

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

tracing: Fix warning in trace_buffered_event_disable()

Warning happened in trace_buffered_event_disable() at
WARN_ON_ONCE(!trace_buffered_event_ref)

Call Trace:
? __warn+0xa5/0x1b0
? trace_buffered_event_disable+0x189/0x1b0
__ftrace_event_enable_disable+0x19e/0x3e0
free_probe_data+0x3b/0xa0
unregister_ftrace_function_probe_func+0x6b8/0x800
event_enable_func+0x2f0/0x3d0
ftrace_process_regex.isra.0+0x12d/0x1b0
ftrace_filter_write+0xe6/0x140
vfs_write+0x1c9/0x6f0
[...]

The cause of the warning is in __ftrace_event_enable_disable(),
trace_buffered_event_enable() was called once while
trace_buffered_event_disable() was called twice.
Reproduction script show as below, for analysis, see the comments:

#!/bin/bash

cd /sys/kernel/tracing/

# 1. Register a 'disable_event' command, then:
#    1) SOFT_DISABLED_BIT was set;
#    2) trace_buffered_event_enable() was called first time;
echo 'cmdline_proc_show:disable_event:initcall:initcall_finish' > \
    set_ftrace_filter

# 2. Enable the event registered, then:
#    1) SOFT_DISABLED_BIT was cleared;
#    2) trace_buffered_event_disable() was called first time;
echo 1 > events/initcall/initcall_finish/enable

# 3. Try to call into cmdline_proc_show(), then SOFT_DISABLED_BIT was
#    set again!!!
cat /proc/cmdline

# 4. Unregister the 'disable_event' command, then:
#    1) SOFT_DISABLED_BIT was cleared again;
#…

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-2023-54211 has been found in Kernel.
Risk of unauthorized operations or information disclosure.
What to do: upgrade Kernel to 4.14.322, 4.19.291, 5.4.253, 5.10.190, 5.15.124, 6.1.43, 6.4.8 or later.
If unsure, ask your IT team or search "Kernel CVE-2023-54211" on the vendor's site.

CVE-2023-54211 (Kernel)
Patched: 4.14.322, 4.19.291, 5.4.253, 5.10.190, 5.15.124, 6.1.43, 6.4.8 — 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.

📍 Affected scope

Check the vendor advisory for the affected versions of Kernel.

🔥 Severity

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

🔧 How to fix

Update to 4.14.322, 4.19.291, 5.4.253, 5.10.190, 5.15.124, 6.1.43, 6.4.8.

🛡️ 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 4.14.322, 4.19.291, 5.4.253, 5.10.190, 5.15.124, 6.1.43, 6.4.8
```
ステージング環境で 4.14.322, 4.19.291, 5.4.253, 5.10.190, 5.15.124, 6.1.43, 6.4.8 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":"4.7.0"},{"fixed":"4.14.322"}]},{"type":"ECOSYSTEM","events":[{"introduced":"4.15.0"},{"fixed":"4.19.291"}]},{"type":"ECOSYSTEM","events":[{"introduced":"4.20.0"},{"fixed":"5.4.253"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.5.0"},{"fixed":"5.10.190"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.124"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.43"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.4.8"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

Debian DEBIAN-CVE-2023-54211 linux Fixed in: 5.10.191-1
Ubuntu UBUNTU-CVE-2023-54211 linux-azure