Red Hat Enterprise Linux 6/7/8/9 X.org X11 Server/TigerVNC GetBarrierDevice out-of-bounds write

Summaryinfo

A vulnerability was found in Red Hat Enterprise Linux 6/7/8/9 and classified as critical. Impacted is the function GetBarrierDevice of the component X.org X11 Server/TigerVNC. Executing a manipulation can lead to out-of-bounds write. This vulnerability appears as CVE-2025-26598. The attack requires local access. There is no available exploit.

Detailsinfo

A vulnerability was found in Red Hat Enterprise Linux 6/7/8/9. It has been declared as critical. This vulnerability affects the function GetBarrierDevice of the component X.org X11 Server/TigerVNC. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

An out-of-bounds write flaw was found in X.Org and Xwayland. The function GetBarrierDevice() searches for the pointer device based on its device ID and returns the matching value, or supposedly NULL, if no match was found. However, the code will return the last element of the list if no matching device ID is found, which can lead to out-of-bounds memory access.

The advisory is available at access.redhat.com. This vulnerability was named CVE-2025-26598 since 02/12/2025. The exploitation appears to be easy. Local access is required to approach this attack. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of 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-2025-5423) and CERT Bund (WID-SEC-2025-0435). 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
• 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

• Operating System

Vendor

• Red Hat

Name

• Enterprise Linux

Version

• 6
• 7
• 8
• 9

License

• commercial

Website

• Vendor: https://www.redhat.com/

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

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