7.8
HIGH
CVE-2025-26601
X.Org Xwayland Use-After-Free Vulnerability
Description

A use-after-free flaw was found in X.Org and Xwayland. When changing an alarm, the values of the change mask are evaluated one after the other, changing the trigger values as requested, and eventually, SyncInitTrigger() is called. If one of the changes triggers an error, the function will return early, not adding the new sync object, possibly causing a use-after-free when the alarm eventually triggers.

INFO

Published Date :

Feb. 25, 2025, 4:15 p.m.

Last Modified :

March 17, 2025, 5:15 a.m.

Remotely Exploitable :

No

Impact Score :

5.9

Exploitability Score :

1.8
Affected Products

The following products are affected by CVE-2025-26601 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 X.org x_server
2 X.org xwayland
1 Redhat enterprise_linux
1 Tigervnc tigervnc

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2025-26601 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2025-26601 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by [email protected]

    Mar. 17, 2025

    Action Type Old Value New Value
    Added Reference https://access.redhat.com/errata/RHSA-2025:2861
    Added Reference https://access.redhat.com/errata/RHSA-2025:2866
    Added Reference https://access.redhat.com/errata/RHSA-2025:2873
    Added Reference https://access.redhat.com/errata/RHSA-2025:2879
    Added Reference https://access.redhat.com/errata/RHSA-2025:2880
  • CVE Modified by [email protected]

    Mar. 17, 2025

    Action Type Old Value New Value
    Added Reference https://access.redhat.com/errata/RHSA-2025:2865
    Added Reference https://access.redhat.com/errata/RHSA-2025:2874
    Added Reference https://access.redhat.com/errata/RHSA-2025:2875
  • CVE Modified by [email protected]

    Mar. 17, 2025

    Action Type Old Value New Value
    Added Reference https://access.redhat.com/errata/RHSA-2025:2862
  • CVE Modified by [email protected]

    Mar. 10, 2025

    Action Type Old Value New Value
    Added Reference https://access.redhat.com/errata/RHSA-2025:2500
    Added Reference https://access.redhat.com/errata/RHSA-2025:2502
  • Initial Analysis by [email protected]

    Mar. 04, 2025

    Action Type Old Value New Value
    Added CPE Configuration OR *cpe:2.3:a:tigervnc:tigervnc:-:*:*:*:*:*:*:*
    Added CPE Configuration OR *cpe:2.3:a:x.org:x_server:-:*:*:*:*:*:*:* *cpe:2.3:a:x.org:xwayland:-:*:*:*:*:*:*:*
    Added CPE Configuration 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:*:*:*:*:*:*:*
    Added Reference Type Red Hat, Inc.: https://access.redhat.com/security/cve/CVE-2025-26601 Types: Third Party Advisory
    Added Reference Type Red Hat, Inc.: https://bugzilla.redhat.com/show_bug.cgi?id=2345251 Types: Issue Tracking
  • New CVE Received by [email protected]

    Feb. 25, 2025

    Action Type Old Value New Value
    Added Description A use-after-free flaw was found in X.Org and Xwayland. When changing an alarm, the values of the change mask are evaluated one after the other, changing the trigger values as requested, and eventually, SyncInitTrigger() is called. If one of the changes triggers an error, the function will return early, not adding the new sync object, possibly causing a use-after-free when the alarm eventually triggers.
    Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
    Added CWE CWE-416
    Added Reference https://access.redhat.com/security/cve/CVE-2025-26601
    Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=2345251
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2025-26601 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2025-26601 weaknesses.

CVSS31 - Vulnerability Scoring System
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