CVE-2025-26601
HIGH severity · CVSS 7.8 · Use-after-free
7.8CVSS HIGH
Summary
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.
Impact & exploitability
Attack vectorLocal
Attack complexityLow
Privileges requiredLow
User interactionNone
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
Exploit probability (EPSS)0%
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products we track (1)
Recommendation
Apply the vendor fix promptly. Open any affected product above for its exact safe version.
Additional information
- NVD record
- https://access.redhat.com/errata/RHSA-2025:2500Advisory
- https://access.redhat.com/errata/RHSA-2025:2502Advisory
- https://access.redhat.com/errata/RHSA-2025:2861Advisory
- https://access.redhat.com/errata/RHSA-2025:2862Advisory
- https://access.redhat.com/errata/RHSA-2025:2865Advisory
- https://access.redhat.com/errata/RHSA-2025:2866Advisory
- https://access.redhat.com/errata/RHSA-2025:2873Advisory
- https://access.redhat.com/errata/RHSA-2025:2874Advisory