CVE-2024-0408

Server crash via unlabeled GLX PBuffer access

Published Jan 18, 2024 · Updated Nov 20, 2025

NULL pointer dereference in X.Org X Server 21.1.0 through 21.1.10 allows local users to crash the server through a GLX request. GLX PBuffer creation omits the XACE hook, leaving its XSELinux security identifier unset; later GetGeometry or graphics-context access dereferences the null identifier. Exploitation requires access as an X client to an XSELinux-enabled server and interrupts the graphical session when the server exits.

CVSS severity5.5
Medium
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in X.Org X Server 21.1.0 through 21.1.10 allows local users to crash the server through a GLX request. GLX PBuffer creation omits the XACE hook, leaving its XSELinux security identifier unset; later GetGeometry or graphics-context access dereferences the null identifier. Exploitation requires access as an X client to an XSELinux-enabled server and interrupts the graphical session when the server exits.

The record

CVE
CVE-2024-0408
Published
Jan 18, 2024
Updated
Nov 20, 2025
Vendor
Red Hat
Product
Red Hat Enterprise Linux 8
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 18, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 20, 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 7Affected versions are unavailable in this record.
Red Hat · Red Hat Enterprise Linux 9Affected versions are unavailable in this record.
X.Org · X.Org X Serverversion=21.1.0 <21.1.11

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-476NULL Pointer Dereference
T1499.004Application or System Exploitation

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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