CVE-2025-26595

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2025-26595
A buffer overflow flaw was found in X.Org and Xwayland. The code in XkbVModMaskText() allocates a fixed-sized buffer on the stack and copies the names of the virtual modifiers to that buffer. The code fails to check the bounds of the buffer and would copy the data regardless of the size.

7.8 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://access.redhat.com/errata/RHSA-2025:2500 Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:2502 Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:2861 Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:2862 Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:2865 Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:2866 Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:2873 Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:2874 Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:2875 Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:2879 Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:2880 Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:7163
https://access.redhat.com/errata/RHSA-2025:7165
https://access.redhat.com/errata/RHSA-2025:7458
https://access.redhat.com/security/cve/CVE-2025-26595 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2345257 Issue Tracking
Configurations

Configuration 1 (hide)

cpe:2.3:a:tigervnc:tigervnc:-:*:*:*:*:*:*:*

Configuration 2 (hide)

OR cpe:2.3:a:x.org:x_server:*:*:*:*:*:*:*:*
cpe:2.3:a:x.org:xwayland:*:*:*:*:*:*:*:*

Configuration 3 (hide)

OR cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*
History

13 May 2025, 20:15

Type Values Removed Values Added
References
  • () https://access.redhat.com/errata/RHSA-2025:7458 -

13 May 2025, 15:15

Type Values Removed Values Added
References
  • () https://access.redhat.com/errata/RHSA-2025:7163 -
  • () https://access.redhat.com/errata/RHSA-2025:7165 -

08 May 2025, 18:01

Type Values Removed Values Added
References () https://access.redhat.com/errata/RHSA-2025:2500 - () https://access.redhat.com/errata/RHSA-2025:2500 - Third Party Advisory
References () https://access.redhat.com/errata/RHSA-2025:2502 - () https://access.redhat.com/errata/RHSA-2025:2502 - Third Party Advisory
References () https://access.redhat.com/errata/RHSA-2025:2861 - () https://access.redhat.com/errata/RHSA-2025:2861 - Third Party Advisory
References () https://access.redhat.com/errata/RHSA-2025:2862 - () https://access.redhat.com/errata/RHSA-2025:2862 - Third Party Advisory
References () https://access.redhat.com/errata/RHSA-2025:2865 - () https://access.redhat.com/errata/RHSA-2025:2865 - Third Party Advisory
References () https://access.redhat.com/errata/RHSA-2025:2866 - () https://access.redhat.com/errata/RHSA-2025:2866 - Third Party Advisory
References () https://access.redhat.com/errata/RHSA-2025:2873 - () https://access.redhat.com/errata/RHSA-2025:2873 - Third Party Advisory
References () https://access.redhat.com/errata/RHSA-2025:2874 - () https://access.redhat.com/errata/RHSA-2025:2874 - Third Party Advisory
References () https://access.redhat.com/errata/RHSA-2025:2875 - () https://access.redhat.com/errata/RHSA-2025:2875 - Third Party Advisory
References () https://access.redhat.com/errata/RHSA-2025:2879 - () https://access.redhat.com/errata/RHSA-2025:2879 - Third Party Advisory
References () https://access.redhat.com/errata/RHSA-2025:2880 - () https://access.redhat.com/errata/RHSA-2025:2880 - Third Party Advisory
CWE CWE-787
CPE cpe:2.3:a:x.org:xwayland:-:*:*:*:*:*:*:*
cpe:2.3:a:x.org:x_server:-:*:*:*:*:*:*:*		 cpe:2.3:a:x.org:xwayland:*:*:*:*:*:*:*:*
cpe:2.3:a:x.org:x_server:*:*:*:*:*:*:*:*

17 Mar 2025, 05:15

Type Values Removed Values Added
References
  • () https://access.redhat.com/errata/RHSA-2025:2861 -
  • () https://access.redhat.com/errata/RHSA-2025:2866 -
  • () https://access.redhat.com/errata/RHSA-2025:2873 -
  • () https://access.redhat.com/errata/RHSA-2025:2879 -
  • () https://access.redhat.com/errata/RHSA-2025:2880 -

17 Mar 2025, 03:15

Type Values Removed Values Added
References
  • () https://access.redhat.com/errata/RHSA-2025:2865 -
  • () https://access.redhat.com/errata/RHSA-2025:2874 -
  • () https://access.redhat.com/errata/RHSA-2025:2875 -

17 Mar 2025, 02:15

Type Values Removed Values Added
References
  • () https://access.redhat.com/errata/RHSA-2025:2862 -

10 Mar 2025, 13:15

Type Values Removed Values Added
References
  • () https://access.redhat.com/errata/RHSA-2025:2500 -
  • () https://access.redhat.com/errata/RHSA-2025:2502 -

04 Mar 2025, 17:22

Type Values Removed Values Added
Summary
  • (es) Se encontró una falla de desbordamiento de búfer en X.Org y Xwayland. El código en XkbVModMaskText() asigna un búfer de tamaño fijo en la pila y copia los nombres de los modificadores virtuales en ese búfer. El código no verifica los límites del búfer y copia los datos independientemente del tamaño.
References () https://access.redhat.com/security/cve/CVE-2025-26595 - () https://access.redhat.com/security/cve/CVE-2025-26595 - Third Party Advisory
References () https://bugzilla.redhat.com/show_bug.cgi?id=2345257 - () https://bugzilla.redhat.com/show_bug.cgi?id=2345257 - Issue Tracking
First Time Tigervnc tigervnc
Tigervnc
X.org x Server
X.org
X.org xwayland
Redhat
Redhat enterprise Linux
CPE cpe:2.3:a:x.org:xwayland:-:*:*:*:*:*:*:*
cpe:2.3:a:x.org:x_server:-:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:a:tigervnc:tigervnc:-:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*

25 Feb 2025, 16:15

Type Values Removed Values Added
New CVE
Information

Published : 2025-02-25 16:15

Updated : 2025-05-13 20:15

NVD link : CVE-2025-26595

Mitre link : CVE-2025-26595

CVE.ORG link : CVE-2025-26595

JSON object : View

Products Affected

tigervnc

  • tigervnc

redhat

  • enterprise_linux

x.org

  • xwayland
  • x_server
CWE
CWE-121

Stack-based Buffer Overflow

CWE-787

Out-of-bounds Write