CVE-2025-49177

Xorg-x11-server-xwayland: xorg-x11-server: tigervnc: data leak in xfixes extension's xfixessetclientdisconnectmode

State: Published
Severity: 6.1 Medium
Published: Jun 17, 2025
Updated: Jun 30, 2026
Reserved: Jun 3, 2025

Description

A flaw was found in the XFIXES extension. The XFixesSetClientDisconnectMode handler does not validate the request length, allowing a client to read unintended memory from previous requests.

Scores

CVSS	Score	Vector	Source
3.1	6.1 Medium	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L	redhat

Weaknesses

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

Affected Products

Product	Versions
xwaylandX.Org	before 24.1.7Affected
Red Hat Enterprise Linux 10Red Hat	0:24.1.5-4.el10_0 and laterNot affected
Red Hat Enterprise Linux 9Red Hat	0:1.20.11-31.el9_6 and laterNot affected
Red Hat Enterprise Linux 9Red Hat	0:23.2.7-4.el9_6 and laterNot affected
Red Hat Enterprise Linux 9.4 Extended Update SupportRed Hat	0:22.1.9-6.el9_4 and laterNot affected
Red Hat Enterprise Linux 6Red Hat
Red Hat Enterprise Linux 6Red Hat
Red Hat Enterprise Linux 7Red Hat
Red Hat Enterprise Linux 7Red Hat
Red Hat Enterprise Linux 8Red Hat
Red Hat Enterprise Linux 8Red Hat
Red Hat Enterprise Linux 8Red Hat
Red Hat Enterprise Linux 9Red Hat

References

RHSA-2025:10258vendor-advisory
RHSA-2025:9303vendor-advisory
RHSA-2025:9304vendor-advisory
https://access.redhat.com/security/cve/CVE-2025-49177vdb-entry
RHBZ#2369955issue-tracking
https://gitlab.freedesktop.org/xorg/xserver/-/commit/ab02fb96b1c701c3bb47617d965522c34befa6af
https://www.x.org/wiki/Development/Security/

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