CVE-2025-26601
Last modified
CVE-2025-26601 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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. EPSS estimates a 0.35% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Tigervnc | Tigervnc | All versions |
| X.Org | X Server | < 21.1.16 |
| X.Org | Xwayland | < 24.1.6 |
| Redhat | Enterprise Linux | 7.0 |
| Redhat | Enterprise Linux | 8.0 |
| Redhat | Enterprise Linux | 9.0 |
References
- https://access.redhat.com/errata/RHSA-2025:2500Third Party Advisory
- https://access.redhat.com/errata/RHSA-2025:2502Third Party Advisory
- https://access.redhat.com/errata/RHSA-2025:2861Third Party Advisory
- https://access.redhat.com/errata/RHSA-2025:2862Third Party Advisory
- https://access.redhat.com/errata/RHSA-2025:2865Third Party Advisory
- https://access.redhat.com/errata/RHSA-2025:2866Third Party Advisory
- https://access.redhat.com/errata/RHSA-2025:2873Third Party Advisory
- https://access.redhat.com/errata/RHSA-2025:2874Third Party Advisory
- https://access.redhat.com/errata/RHSA-2025:2875Third Party Advisory
- https://access.redhat.com/errata/RHSA-2025:2879Third Party Advisory
- https://access.redhat.com/errata/RHSA-2025:2880Third Party Advisory
- https://access.redhat.com/security/cve/CVE-2025-26601Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2345251Issue Tracking
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2025-26601?
How severe is CVE-2025-26601?
How do I fix CVE-2025-26601?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2025
- CVE-2025-26596A heap overflow flaw was found in X.Org and Xwayland. The co…7.8
- CVE-2025-26597A buffer overflow flaw was found in X.Org and Xwayland. If X…7.8
- CVE-2025-26598An out-of-bounds write flaw was found in X.Org and Xwayland.…7.8
- CVE-2025-26599An access to an uninitialized pointer flaw was found in X.Or…7.8
- CVE-2025-2660A vulnerability has been found in Project Worlds Online Time…9.8
- CVE-2025-26600A use-after-free flaw was found in X.Org and Xwayland. When …7.8
- CVE-2025-26603Vim is a greatly improved version of the good old UNIX edito…4.2
- CVE-2025-26604Discord-Bot-Framework-Kernel is a Discord bot framework buil…8.3
- CVE-2025-26605WeGIA is an open source Web Manager for Institutions with a …8.8
- CVE-2025-26606WeGIA is an open source Web Manager for Institutions with a …9.8
- CVE-2025-26607WeGIA is an open source Web Manager for Institutions with a …9.8
- CVE-2025-26608WeGIA is an open source Web Manager for Institutions with a …9.8
Are you affected by CVE-2025-26601?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST