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CVE-2025-26595

High

Description

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.

SeverityHigh
CVSS7.8
Exploit probability—
ProductX.org Xwayland
PublishedFeb 25, 2025
First seenFeb 25, 2025
Weakness typeCWE-121CWE-121

How to fix

Update
  • x.org xwayland24.1.6 or later
  • x.org x_server21.1.16 or later
Vendor advisories

Affected products

ProductAffected versionsFixed in
x.org xwaylandv < 24.1.624.1.6
tigervnc tigervncNo range specified—
x.org x_serverv < 21.1.1621.1.16
redhat enterprise_linux7.0, 8.0, 9.0—

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