Red Hat Enterprise Linux 6/7/8/9 X.org X11 Server/TigerVNC XkbChangeTypesOfKey heap-based overflow

CVSS Meta Temp Score
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CTI Interest Score
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7.8$5k-$25k0.00

Summaryinfo

A vulnerability has been found in Red Hat Enterprise Linux 6/7/8/9 and classified as critical. This issue affects the function XkbChangeTypesOfKey of the component X.org X11 Server/TigerVNC. Performing a manipulation results in heap-based overflow. This vulnerability is reported as CVE-2025-26597. The attack requires a local approach. No exploit exists.

Detailsinfo

A vulnerability was found in Red Hat Enterprise Linux 6/7/8/9. It has been classified as critical. This affects the function XkbChangeTypesOfKey of the component X.org X11 Server/TigerVNC. The manipulation with an unknown input leads to a heap-based overflow vulnerability. CWE is classifying the issue as CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

A buffer overflow flaw was found in X.Org and Xwayland. If XkbChangeTypesOfKey() is called with a 0 group, it will resize the key symbols table to 0 but leave the key actions unchanged. If the same function is later called with a non-zero value of groups, this will cause a buffer overflow because the key actions are of the wrong size.

The advisory is shared at access.redhat.com. This vulnerability is uniquely identified as CVE-2025-26597 since 02/12/2025. The exploitability is told to be easy. An attack has to be approached locally. Technical details are known, but no exploit is available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 06/06/2026).

The vulnerability scanner Nessus provides a plugin with the ID 216902 (SUSE SLED15 / SLES15 / openSUSE 15 Security Update : xorg-x11-server (SUSE-SU-2025:0730-1)), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (216902), EUVD (EUVD-2025-5382) and CERT Bund (WID-SEC-2025-0435). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Fedora Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • Gentoo Linux
  • IGEL OS
  • SUSE openSUSE
  • RESF Rocky Linux
  • OpenBSD OpenBSD
  • Dell NetWorker
  • Dell Avamar
  • Open Source X.Org X11
  • Open Source Xming
  • Dell PowerProtect Data Domain

Productinfo

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.8
VulDB Meta Temp Score: 7.8

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

NVD Base Score: 7.8
NVD Vector: 🔍

CNA Base Score: 7.8
CNA Vector (redhat): 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Heap-based overflow
CWE: CWE-122 / 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: 216902
Nessus Name: SUSE SLED15 / SLES15 / openSUSE 15 Security Update : xorg-x11-server (SUSE-SU-2025:0730-1)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

02/12/2025 🔍
02/25/2025 +13 days 🔍
02/25/2025 +0 days 🔍
06/06/2026 +466 days 🔍

Sourcesinfo

Vendor: redhat.com

Advisory: access.redhat.com
Status: Confirmed

CVE: CVE-2025-26597 (🔍)
GCVE (CVE): GCVE-0-2025-26597
GCVE (VulDB): GCVE-100-296817
EUVD: 🔍
CERT Bund: WID-SEC-2025-0435 - X.Org X11: Mehrere Schwachstellen ermöglichen nicht näher spezifizierte Auswirkungen, möglicherweise Codeausführung

Entryinfo

Created: 02/25/2025 18:24
Updated: 06/06/2026 09:25
Changes: 02/25/2025 18:24 (64), 02/27/2025 12:16 (2), 03/10/2025 14:28 (1), 06/16/2025 18:13 (1), 07/24/2025 18:47 (7), 06/02/2026 07:00 (9), 06/06/2026 09:25 (1)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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