CVE-2025-26601

Xorg: xwayland: use-after-free in syncinittrigger()

HIGH 7.8

At a glance

Source: NVD
EPSS: EPSS 0.39 % · percentile 33 (2026-10-28)
State: PUBLISHED
Published: 2025-02-25 15:55 UTC
Updated: 2026-06-29 20:37 UTC
Assigner: redhat
NVD status: Modified

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.

Weaknesses (CWE)

CWE-416 — Use After Free

References

Scores

Version	Score	Vector	Scored by
CVSS 3.1	HIGH 7.8	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	redhat
CVSS 3.1	HIGH 7.8	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	NVD · secalert@redhat.com (Secondary)
CVSS 3.1	HIGH 7.8	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	NVD · nvd@nist.gov (Primary)

European references

ENISA EUVD · EUVD-2025-5426
GCVE · GCVE-0-2025-26601

CERT-FR advisories

CERTFR-2025-AVI-0855 — Multiples vulnérabilités dans les produits Juniper Networks · cert.ssi.gouv.fr

Affected configurations (NVD CPE)

cpe:2.3:a:tigervnc:tigervnc:-:*:*:*:*:*:*:*
cpe:2.3:a:x.org:x_server:*:*:*:*:*:*:*:* < 21.1.16
cpe:2.3:a:x.org:xwayland:*:*:*:*:*:*:*:* < 24.1.6
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:*:*:*:*:*:*:*

Affected products

Product	Versions
xserver	affected 0 < 21.1.16 ; affected 22.0.0 < 24.1.6
Red Hat · Red Hat Enterprise Linux 10	unaffected 0:24.1.5-3.el10_0 < *
Red Hat · Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION	unaffected 0:1.1.0-25.el6_10 < *
Red Hat · Red Hat Enterprise Linux 7 Extended Lifecycle Support	unaffected 0:1.8.0-36.el7_9 < *
Red Hat · Red Hat Enterprise Linux 7 Extended Lifecycle Support	unaffected 0:1.20.4-30.el7_9 < *
Red Hat · Red Hat Enterprise Linux 8	unaffected 0:1.13.1-15.el8_10 < *
Red Hat · Red Hat Enterprise Linux 8.2 Advanced Update Support	unaffected 0:1.9.0-15.el8_2.13 < *
Red Hat · Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support	unaffected 0:1.11.0-8.el8_4.12 < *
Red Hat · Red Hat Enterprise Linux 8.4 Telecommunications Update Service	unaffected 0:1.11.0-8.el8_4.12 < *
Red Hat · Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions	unaffected 0:1.11.0-8.el8_4.12 < *
Red Hat · Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support	unaffected 0:1.12.0-6.el8_6.13 < *
Red Hat · Red Hat Enterprise Linux 8.6 Telecommunications Update Service	unaffected 0:1.12.0-6.el8_6.13 < *
Red Hat · Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions	unaffected 0:1.12.0-6.el8_6.13 < *
Red Hat · Red Hat Enterprise Linux 8.8 Extended Update Support	unaffected 0:1.12.0-15.el8_8.12 < *
Red Hat · Red Hat Enterprise Linux 9	unaffected 0:1.14.1-1.el9_5.1 < *
Red Hat · Red Hat Enterprise Linux 9	unaffected 0:1.20.11-28.el9_6 < *
Red Hat · Red Hat Enterprise Linux 9	unaffected 0:23.2.7-3.el9_6 < *
Red Hat · Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions	unaffected 0:1.11.0-22.el9_0.13 < *
Red Hat · Red Hat Enterprise Linux 9.2 Extended Update Support	unaffected 0:1.12.0-14.el9_2.10 < *
Red Hat · Red Hat Enterprise Linux 9.4 Extended Update Support	unaffected 0:1.13.1-8.el9_4.5 < *

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)	Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD