X.org X11 Server XkbRemoveResourceClient use after free

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

Summaryinfo

A vulnerability was found in X.org X11 Server. It has been classified as critical. This affects the function XkbRemoveResourceClient. The manipulation leads to use after free. This vulnerability is listed as CVE-2025-62230. The attack must be carried out locally. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in X.org X11 Server (unknown version) and classified as critical. This issue affects the function XkbRemoveResourceClient. The manipulation with an unknown input leads to a use after free vulnerability. Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

A flaw was discovered in the X.Org X server’s X Keyboard (Xkb) extension when handling client resource cleanup. The software frees certain data structures without properly detaching related resources, leading to a use-after-free condition. This can cause memory corruption or a crash when affected clients disconnect.

It is possible to read the advisory at zerodayinitiative.com. The identification of this vulnerability is CVE-2025-62230. The exploitation is known to be easy. Attacking locally is a requirement. Technical details of the vulnerability 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-2025-36902) and CERT Bund (WID-SEC-2025-2436). Be aware that VulDB is the high quality source for vulnerability data.

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: Use after free
CWE: CWE-416 / CWE-119
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-2025-62230 (🔒)
GCVE (CVE): GCVE-0-2025-62230
GCVE (VulDB): GCVE-100-330503
EUVD: 🔒
CERT Bund: WID-SEC-2025-2436 - Xwayland und X.Org X11: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff

Entryinfo

Created: 10/29/2025 23:51
Updated: 01/17/2026 17:26
Changes: 10/29/2025 23:51 (51), 10/30/2025 02:47 (7), 10/30/2025 07:32 (12), 10/30/2025 09:17 (1), 10/30/2025 13:22 (2), 10/31/2025 09:50 (1), 11/03/2025 12:16 (1), 11/09/2025 06:08 (1), 11/28/2025 16:00 (1), 01/17/2026 17:26 (1)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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