Uninitialized pointer flaw in X.Org X server compCheckRedirect()
CVE-2025-26599 Published on February 25, 2025

Xorg: xwayland: use of uninitialized pointer in compredirectwindow()
An access to an uninitialized pointer flaw was found in X.Org and Xwayland. The function compCheckRedirect() may fail if it cannot allocate the backing pixmap. In that case, compRedirectWindow() will return a BadAlloc error without validating the window tree marked just before, which leaves the validated data partly initialized and the use of an uninitialized pointer later.

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Vulnerability Analysis

CVE-2025-26599 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

Access of Uninitialized Pointer

The program accesses or uses a pointer that has not been initialized.


Products Associated with CVE-2025-26599

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2025-26599 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 E4s
 
Red Hat Rhel Tus
 
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.