Buffer Overflow in X.Org Xwayland via XkbChangeTypesOfKey() misuse
CVE-2025-26597 Published on February 25, 2025

Xorg: xwayland: buffer overflow in xkbchangetypesofkey()
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.

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Vulnerability Analysis

CVE-2025-26597 can be exploited with local system access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.

Attack Vector:
LOCAL
Attack Complexity:
LOW
Privileges Required:
LOW
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
HIGH
Availability Impact:
HIGH

Timeline

Reported to Red Hat.

Made public. 13 days later.

Weakness Type

What is a Buffer Overflow Vulnerability?

The software performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer.

CVE-2025-26597 has been classified to as a Buffer Overflow vulnerability or weakness.


Products Associated with CVE-2025-26597

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2025-26597 are published in these products:

Tigervnc
 
Xorg X Server
 
Xorg Xwayland
 
Red Hat Enterprise Linux (RHEL)
 
Red Hat Rhel Els
 
Red Hat Rhel Aus
 
Red Hat Rhel Tus
 
Red Hat Rhel E4s
 
Red Hat Rhel Eus
 

Exploit Probability

EPSS
0.05%
Percentile
16.24%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.