CVE-2023-4133

System crash via rearmed cxgb4 statistics timer

Published Aug 3, 2023 · Updated Nov 6, 2025

Use-after-free in the cxgb4 driver in Red Hat Enterprise Linux 8 and 9 allows local users to crash the system during device detach. The cxgb4_cleanup_tc_flower() path only synchronously deletes flower_stats_timer, while flower_stats_work can rearm it after teardown and later dereference the freed adapter. Reaching the flaw requires local privileges or physical access to remove or unbind a cxgb4 device, and the bounded consequence is a system crash.

CVSS severity5.5
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the cxgb4 driver in Red Hat Enterprise Linux 8 and 9 allows local users to crash the system during device detach. The cxgb4_cleanup_tc_flower() path only synchronously deletes flower_stats_timer, while flower_stats_work can rearm it after teardown and later dereference the freed adapter. Reaching the flaw requires local privileges or physical access to remove or unbind a cxgb4 device, and the bounded consequence is a system crash.

The record

CVE
CVE-2023-4133
Published
Aug 3, 2023
Updated
Nov 6, 2025
Vendor
Red Hat
Product
Red Hat Enterprise Linux 8
Classifications
CWE-416
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 3, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 6, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Red Hat · Red Hat Enterprise Linux 8Affected versions are unavailable in this record.
Red Hat · Red Hat Enterprise Linux 9Affected versions are unavailable in this record.

Published CVSS scores

5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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