X.org X11 Server XkbSetCompatMap numeric truncation error

CVSS Meta Temp Score
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CTI Interest Score
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7.4$0-$5k0.00

Summaryinfo

A vulnerability categorized as critical has been discovered in X.org X11 Server. Affected by this vulnerability is the function XkbSetCompatMap. Such manipulation leads to numeric truncation error. This vulnerability is documented as CVE-2025-62231. The attack needs to be performed locally. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in X.org X11 Server (affected version unknown). It has been rated as critical. Affected by this issue is the function XkbSetCompatMap. The manipulation with an unknown input leads to a numeric truncation error vulnerability. Using CWE to declare the problem leads to CWE-197. Truncation errors occur when a primitive is cast to a primitive of a smaller size and data is lost in the conversion. Impacted is confidentiality, integrity, and availability. CVE summarizes:

A flaw was identified in the X.Org X server’s X Keyboard (Xkb) extension where improper bounds checking in the XkbSetCompatMap() function can cause an unsigned short overflow. If an attacker sends specially crafted input data, the value calculation may overflow, leading to memory corruption or a crash.

The advisory is available at zerodayinitiative.com. This vulnerability is handled as CVE-2025-62231. The exploitation is known to be easy. Local access is required to approach this attack. Technical details are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 271977 (Debian dla-4353 : xdmx - security update), which helps to determine the existence of the flaw in a target environment.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (271977), EUVD (EUVD-2025-36898) and CERT Bund (WID-SEC-2025-2436). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Fedora Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • RESF Rocky Linux
  • OpenBSD OpenBSD
  • Open Source Xwayland
  • Open Source X.Org X11
  • IGEL OS

Productinfo

Type

Vendor

Name

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.6
VulDB Meta Temp Score: 7.4

VulDB Base Score: 7.8
VulDB Temp Score: 7.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.3
CNA Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Numeric truncation error
CWE: CWE-197 / CWE-189
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 271977
Nessus Name: Debian dla-4353 : xdmx - security update

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Timelineinfo

10/29/2025 Advisory disclosed
10/29/2025 +0 days VulDB entry created
01/17/2026 +80 days VulDB entry last update

Sourcesinfo

Vendor: x.org

Advisory: zerodayinitiative.com
Status: Confirmed

CVE: CVE-2025-62231 (🔒)
GCVE (CVE): GCVE-0-2025-62231
GCVE (VulDB): GCVE-100-330506
EUVD: 🔒
CERT Bund: WID-SEC-2025-2436 - Xwayland und X.Org X11: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff

Entryinfo

Created: 10/29/2025 23:52
Updated: 01/17/2026 17:26
Changes: 10/29/2025 23:52 (50), 10/30/2025 03:33 (7), 10/30/2025 07:14 (12), 10/30/2025 07:32 (5), 10/30/2025 09:17 (1), 10/30/2025 13:22 (2), 10/31/2025 08:37 (1), 11/03/2025 12:16 (1), 11/09/2025 10:21 (1), 11/28/2025 16:00 (1), 01/17/2026 17:26 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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