CVE-2025-26601

HIGH

Tigervnc < 21.1.16 - Use After Free

Title source: rule
STIX 2.1

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.

References (19)

Core 19
Core References
Third Party Advisory vendor-advisory x_refsource_redhat
https://access.redhat.com/errata/RHSA-2025:2500
Third Party Advisory vendor-advisory x_refsource_redhat
https://access.redhat.com/errata/RHSA-2025:2502
Third Party Advisory vendor-advisory x_refsource_redhat
https://access.redhat.com/errata/RHSA-2025:2861
Third Party Advisory vendor-advisory x_refsource_redhat
https://access.redhat.com/errata/RHSA-2025:2862
Third Party Advisory vendor-advisory x_refsource_redhat
https://access.redhat.com/errata/RHSA-2025:2865
Third Party Advisory vendor-advisory x_refsource_redhat
https://access.redhat.com/errata/RHSA-2025:2866
Third Party Advisory vendor-advisory x_refsource_redhat
https://access.redhat.com/errata/RHSA-2025:2873
Third Party Advisory vendor-advisory x_refsource_redhat
https://access.redhat.com/errata/RHSA-2025:2874
Third Party Advisory vendor-advisory x_refsource_redhat
https://access.redhat.com/errata/RHSA-2025:2875
Third Party Advisory vendor-advisory x_refsource_redhat
https://access.redhat.com/errata/RHSA-2025:2879
Third Party Advisory vendor-advisory x_refsource_redhat
https://access.redhat.com/errata/RHSA-2025:2880
Vendor Advisory vendor-advisory x_refsource_redhat
RHSA-2025:3976
https://access.redhat.com/errata/RHSA-2025:3976
Vendor Advisory vendor-advisory x_refsource_redhat
https://access.redhat.com/errata/RHSA-2025:7163
Vendor Advisory vendor-advisory x_refsource_redhat
https://access.redhat.com/errata/RHSA-2025:7165
Vendor Advisory vendor-advisory x_refsource_redhat
https://access.redhat.com/errata/RHSA-2025:7458
Third Party Advisory vdb-entry x_refsource_redhat
https://access.redhat.com/security/cve/CVE-2025-26601
Issue Tracking issue-tracking x_refsource_redhat
https://bugzilla.redhat.com/show_bug.cgi?id=2345251

Scores

CVSS v3 7.8
EPSS 0.0003
EPSS Percentile 10.4%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-416
Status published
Products (27)
Red Hat/Red Hat Enterprise Linux 10 0:24.1.5-3.el10_0
Red Hat/Red Hat Enterprise Linux 6
Red Hat/Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION 0:1.1.0-25.el6_10
Red Hat/Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:1.20.4-30.el7_9
Red Hat/Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:1.8.0-36.el7_9
Red Hat/Red Hat Enterprise Linux 8
Red Hat/Red Hat Enterprise Linux 8 0:1.13.1-15.el8_10
Red Hat/Red Hat Enterprise Linux 8.2 Advanced Update Support 0:1.9.0-15.el8_2.13
Red Hat/Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:1.11.0-8.el8_4.12
Red Hat/Red Hat Enterprise Linux 8.4 Telecommunications Update Service 0:1.11.0-8.el8_4.12
... and 17 more
Published Feb 25, 2025
Tracked Since Feb 18, 2026