🛡️ CVE-2023-6816 — debian-linux

🔴 CVSS 9.8 — Critical ✅ No Known Exploit CWE-787 NVD
9.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

A flaw was found in X.Org server. Both DeviceFocusEvent and the XIQueryPointer reply contain a bit for each logical button currently down. Buttons can be arbitrarily mapped to any value up to 255, but the X.Org Server was only allocating space for the device's particular number of buttons, leading to a heap overflow if a bigger value was used.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Weakness class

CVE-2023-6816 is classified as CWE-787: Out-of-bounds Write. Data is written past the end or before the start of a buffer, corrupting whatever is stored there.

Affected software

CVE-2023-6816 is recorded against 7 packages.

  • debian-linux
  • enterprise-linux-desktop
  • enterprise-linux-server
  • enterprise-linux-workstation
  • fedora
  • x-server (fixed in 21.1.11)
  • xwayland (fixed in 23.2.4)

Timeline and source

Published on 18 January 2024 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

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CVE-2023-6816 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity CRITICAL
CVSS Score 9.8
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE CWE-787
Public Exploit ✅ No
Source NVD
Published 2024-01-18
Updated 2026-08-11
Modified 2026-06-17
Fix URL N/A

Affected Packages

Software From version Fixed in
debian-linux
enterprise-linux-desktop
enterprise-linux-server
enterprise-linux-workstation
fedora
x-server 21.1.11
xwayland 23.2.4

References

Similar Threats

Exploit Protection

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