CVE-2023-45931

Application crash via unchecked XCB extension reply

Published Mar 27, 2024 · Updated Nov 4, 2025

NULL pointer dereference in Mesa 23.0.4 allows attackers to crash an X11 software-rendering application via a failed MIT-SHM query. In the reported has_error path, check_xshm reads shm_reply->major_opcode after xcb_query_extension_reply without checking whether the reply pointer is NULL. Reachability requires the GLX software-rendering path to query MIT-SHM against an errored X connection; upstream disputes any demonstrable security scenario, bounding the reported effect to an application crash.

CVSS severity7.5
High
EPSS probability1.03%
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 Mesa 23.0.4 allows attackers to crash an X11 software-rendering application via a failed MIT-SHM query. In the reported has_error path, check_xshm reads shm_reply->major_opcode after xcb_query_extension_reply without checking whether the reply pointer is NULL. Reachability requires the GLX software-rendering path to query MIT-SHM against an errored X connection; upstream disputes any demonstrable security scenario, bounding the reported effect to an application crash.

The record

CVE
CVE-2023-45931
Published
Mar 27, 2024
Updated
Nov 4, 2025
Vendor
Mesa
Product
Mesa
Classifications
CWE-476, T1499
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Mar 27, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=23.0.4

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

Mesa · Mesaversion=23.0.4

Published CVSS scores

7.5CISA ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.2SUSECVSS:3.1/AV:L/AC:L/PR:H/UI:R/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)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

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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