CVE-2025-26599

Xorg: xwayland: use of uninitialized pointer in compredirectwindow()

HIGH 7.8

At a glance

Source: NVD
EPSS: EPSS 0.40 % · percentile 35 (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

An access to an uninitialized pointer flaw was found in X.Org and Xwayland. The function compCheckRedirect() may fail if it cannot allocate the backing pixmap. In that case, compRedirectWindow() will return a BadAlloc error without validating the window tree marked just before, which leaves the validated data partly initialized and the use of an uninitialized pointer later.

Weaknesses (CWE)

CWE-824 — Access of Uninitialized Pointer

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-2025-5424
GCVE · GCVE-0-2025-26599

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