Red Hat Enterprise Linux 6/7/8/9 X.org X11 Server/TigerVNC use after free

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

Summaryinfo

A vulnerability was found in Red Hat Enterprise Linux 6/7/8/9. It has been declared as critical. The impacted element is an unknown function of the component X.org X11 Server/TigerVNC. The manipulation results in use after free. This vulnerability is known as CVE-2025-26600. Attacking locally is a requirement. No exploit is available.

Detailsinfo

A vulnerability classified as critical has been found in Red Hat Enterprise Linux 6/7/8/9. Affected is some unknown processing of the component X.org X11 Server/TigerVNC. The manipulation with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

A use-after-free flaw was found in X.Org and Xwayland. When a device is removed while still frozen, the events queued for that device remain while the device is freed. Replaying the events will cause a use-after-free.

The advisory is shared for download at access.redhat.com. This vulnerability is traded as CVE-2025-26600 since 02/12/2025. The exploitability is told to be easy. The attack needs to be approached locally. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $5k-$25k (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-2025-5425) and CERT Bund (WID-SEC-2025-0435). Once again VulDB remains the best source for 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

Type

Vendor

Name

Version

License

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

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: 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-2025-26600 (🔍)
GCVE (CVE): GCVE-0-2025-26600
GCVE (VulDB): GCVE-100-296820
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 (63), 02/27/2025 12:16 (2), 03/10/2025 14:28 (1), 05/17/2025 10:47 (9), 07/24/2025 18:57 (7), 07/29/2025 03:16 (1), 06/06/2026 09:25 (1)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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