Vulnerabilities
Misconfiguration
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CVE Vulnerabilities

CVE-2025-26601

Use After Free

Published: Feb 25, 2025 | Modified: Nov 03, 2025
CVSS 3.x
7.8
HIGH
Source:
NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 2.x
RedHat/V2
RedHat/V3
7.8 IMPORTANT
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Ubuntu
MEDIUM
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2025-26601
CWEhttps://cwe.mitre.org/data/definitions/416.html

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.

Weakness

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.

Affected Software

NameVendorStart VersionEnd Version
TigervncTigervnc- (including)- (including)
Red Hat Enterprise Linux 10RedHatxorg-x11-server-Xwayland-0:24.1.5-3.el10_0*
Red Hat Enterprise Linux 7 Extended Lifecycle SupportRedHattigervnc-0:1.8.0-36.el7_9*
Red Hat Enterprise Linux 7 Extended Lifecycle SupportRedHatxorg-x11-server-0:1.20.4-30.el7_9*
Red Hat Enterprise Linux 8RedHattigervnc-0:1.13.1-15.el8_10*
Red Hat Enterprise Linux 8.2 Advanced Update SupportRedHattigervnc-0:1.9.0-15.el8_2.13*
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRedHattigervnc-0:1.11.0-8.el8_4.12*
Red Hat Enterprise Linux 8.4 Telecommunications Update ServiceRedHattigervnc-0:1.11.0-8.el8_4.12*
Red Hat Enterprise Linux 8.4 Update Services for SAP SolutionsRedHattigervnc-0:1.11.0-8.el8_4.12*
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRedHattigervnc-0:1.12.0-6.el8_6.13*
Red Hat Enterprise Linux 8.6 Telecommunications Update ServiceRedHattigervnc-0:1.12.0-6.el8_6.13*
Red Hat Enterprise Linux 8.6 Update Services for SAP SolutionsRedHattigervnc-0:1.12.0-6.el8_6.13*
Red Hat Enterprise Linux 8.8 Extended Update SupportRedHattigervnc-0:1.12.0-15.el8_8.12*
Red Hat Enterprise Linux 9RedHattigervnc-0:1.14.1-1.el9_5.1*
Red Hat Enterprise Linux 9RedHatxorg-x11-server-0:1.20.11-28.el9_6*
Red Hat Enterprise Linux 9RedHatxorg-x11-server-Xwayland-0:23.2.7-3.el9_6*
Red Hat Enterprise Linux 9.0 Update Services for SAP SolutionsRedHattigervnc-0:1.11.0-22.el9_0.13*
Red Hat Enterprise Linux 9.2 Extended Update SupportRedHattigervnc-0:1.12.0-14.el9_2.10*
Red Hat Enterprise Linux 9.4 Extended Update SupportRedHattigervnc-0:1.13.1-8.el9_4.5*
Xorg-serverUbuntudevel*
Xorg-serverUbuntuesm-infra/bionic*
Xorg-serverUbuntuesm-infra/focal*
Xorg-serverUbuntuesm-infra/xenial*
Xorg-serverUbuntufocal*
Xorg-serverUbuntujammy*
Xorg-serverUbuntunoble*
Xorg-serverUbuntuoracular*
Xorg-serverUbuntuplucky*
Xorg-serverUbuntuquesting*
Xorg-serverUbuntuupstream*
Xorg-server-hwe-16.04Ubuntuesm-infra/xenial*
Xorg-server-hwe-18.04Ubuntuesm-infra/bionic*
XwaylandUbuntudevel*
XwaylandUbuntujammy*
XwaylandUbuntunoble*
XwaylandUbuntuoracular*
XwaylandUbuntuplucky*
XwaylandUbuntuquesting*
XwaylandUbuntuupstream*

Potential Mitigations

References

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