9.8

CVE-2023-6816: debian debian_linux Out-of-bounds Write

CVSS: 9.8v3.1CriticalModified
AliasesUBUNTU-CVE-2023-6816DEBIAN-CVE-2023-6816CGA-q3pr-57r3-3m6w
Published 18-01-2024Last modified 19-03-2026
Open JSON

Vulnerability summary

CVE-2023-6816 is a critical (CVSS 9.8) Out-of-bounds Write vulnerability in debian debian_linux. EPSS estimates a 2.11% chance of exploitation in the next 30 days, higher than 81.4% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
2.11%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 28 · Related 12
DLA-3721-1DSA-5603-1MGASA-2024-0022OPENSUSE-SU-2024:13597-1OPENSUSE-SU-2024:13598-1RHSA-2024:0320

Timeline

  1. 18-01-2024
    PublishedVulnerability first disclosed.
  2. 19-03-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

6 scores · 6 sources · 1 version

EPSS trend

Probability

2.11%

Chance of exploitation in the next 30 days

Percentile

81%

Versus all other CVEs

30-day change

0.00 pp

From 2.11% on 19-09-2026

19-09-202619-10-2026
EPSS score
2.11%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu4 products
  • xorg-server< 2:1.15.1-0ubuntu2.11+esm9 | < 2:1.18.4-0ubuntu0.12+esm9 | < 2:1.19.6-1ubuntu4.15+esm4 | < 2:1.20.13-1ubuntu1~20.04.14 | < 2:21.1.4-2ubuntu1.7~22.04.7
  • xorg-server-hwe-16.04All versions (No fix recorded)
  • xorg-server-hwe-18.04All versions (No fix recorded)
  • xwayland< 2:22.1.1-1ubuntu0.10 | < 2:23.2.4-1
Debian3 products
  • xorg-server< 2:21.1.7-3+deb12u5 | < 2:21.1.11-1
  • xwaylandAll versions (No fix recorded) | < 2:23.2.4-1
  • debian_linuxEOL10.0
Redhat3 products
X.org2 products
Chainguard1 product
  • xorg-server< 21.1.10-r5
Fedoraproject1 product
Wolfi1 product
  • xorg-server< 21.1.10-r5

7 vendors · 15 products

References

31 links
Show all 31 references