CVE-2025-49178

Xorg-x11-server-xwayland: xorg-x11-server: tigervnc: unprocessed client request due to bytes to ignore

State: Published
Severity: 5.5 Medium
Published: Jun 17, 2025
Updated: Jun 30, 2026
Reserved: Jun 3, 2025

Description

A flaw was found in the X server's request handling. Non-zero 'bytes to ignore' in a client's request can cause the server to skip processing another client's request, potentially leading to a denial of service.

Scores

CVSS	Score	Vector	Source
3.1	5.5 Medium	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	redhat

Weaknesses

CWE-667 Improper Locking

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 6 Extended Lifecycle Support - EXTENSIONRed Hat	0:1.1.0-25.el6_10.1 and laterNot affected
Red Hat Enterprise Linux 7.7 Advanced Update SupportRed Hat	0:1.8.0-17.el7_7.1 and laterNot affected
Red Hat Enterprise Linux 7 Extended Lifecycle SupportRed Hat	0:1.20.4-32.el7_9 and laterNot affected
Red Hat Enterprise Linux 7 Extended Lifecycle SupportRed Hat	0:1.8.0-36.el7_9.2 and laterNot affected
Red Hat Enterprise Linux 8Red Hat	0:1.20.11-26.el8_10 and laterNot affected
Red Hat Enterprise Linux 8Red Hat	0:21.1.3-18.el8_10 and laterNot affected
Red Hat Enterprise Linux 8Red Hat	0:1.15.0-7.el8_10 and laterNot affected
Red Hat Enterprise Linux 8.2 Advanced Update SupportRed Hat	0:1.9.0-15.el8_2.14 and laterNot affected
Red Hat Enterprise Linux 8.2 Advanced Update SupportRed Hat	0:1.20.6-4.el8_2 and laterNot affected
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRed Hat	0:1.20.10-2.el8_4 and laterNot affected
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRed Hat	0:1.11.0-8.el8_4.13 and laterNot affected
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnRed Hat	0:1.20.10-2.el8_4 and laterNot affected
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnRed Hat	0:1.11.0-8.el8_4.13 and laterNot affected
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRed Hat	0:1.12.0-6.el8_6.14 and laterNot affected
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRed Hat	0:21.1.3-2.el8_6.4 and laterNot affected
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRed Hat	0:1.20.11-5.el8_6.3 and laterNot affected
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-OnRed Hat	0:1.12.0-6.el8_6.14 and laterNot affected
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-OnRed Hat	0:21.1.3-2.el8_6.4 and laterNot affected
Red Hat Enterprise Linux 8.6 Telecommunications Update ServiceRed Hat	0:1.12.0-6.el8_6.14 and laterNot affected
Red Hat Enterprise Linux 8.6 Telecommunications Update ServiceRed Hat	0:21.1.3-2.el8_6.4 and laterNot affected
Red Hat Enterprise Linux 8.6 Telecommunications Update ServiceRed Hat	0:1.20.11-5.el8_6.3 and laterNot affected
Red Hat Enterprise Linux 8.6 Update Services for SAP SolutionsRed Hat	0:1.12.0-6.el8_6.14 and laterNot affected
Red Hat Enterprise Linux 8.6 Update Services for SAP SolutionsRed Hat	0:21.1.3-2.el8_6.4 and laterNot affected
Red Hat Enterprise Linux 8.6 Update Services for SAP SolutionsRed Hat	0:1.20.11-5.el8_6.3 and laterNot affected
Red Hat Enterprise Linux 8.8 Extended Update Support Long-Life Add-OnRed Hat	0:1.20.11-16.el8_8 and laterNot affected
Red Hat Enterprise Linux 8.8 Extended Update Support Long-Life Add-OnRed Hat	0:21.1.3-11.el8_8 and laterNot affected
Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceRed Hat	0:1.20.11-16.el8_8 and laterNot affected
Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceRed Hat	0:1.12.0-15.el8_8.14 and laterNot affected
Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceRed Hat	0:21.1.3-11.el8_8 and laterNot affected
Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRed Hat	0:1.20.11-16.el8_8 and laterNot affected
Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRed Hat	0:1.12.0-15.el8_8.14 and laterNot affected
Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRed Hat	0:21.1.3-11.el8_8 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 9Red Hat	0:1.14.1-8.el9_6 and laterNot affected
Red Hat Enterprise Linux 9.0 Update Services for SAP SolutionsRed Hat	0:21.1.3-3.el9_0 and laterNot affected
Red Hat Enterprise Linux 9.0 Update Services for SAP SolutionsRed Hat	0:1.20.11-11.el9_0 and laterNot affected
Red Hat Enterprise Linux 9.0 Update Services for SAP SolutionsRed Hat	0:1.11.0-22.el9_0.15 and laterNot affected
Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsRed Hat	0:21.1.3-8.el9_2 and laterNot affected
Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsRed Hat	0:1.20.11-18.el9_2 and laterNot affected
Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsRed Hat	0:1.12.0-14.el9_2.12 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 9.4 Extended Update SupportRed Hat	0:1.20.11-26.el9_4 and laterNot affected
Red Hat Enterprise Linux 9.4 Extended Update SupportRed Hat	0:1.13.1-8.el9_4.7 and laterNot affected
Red Hat Enterprise Linux 6Red Hat

References

RHSA-2025:10258vendor-advisory
RHSA-2025:10342vendor-advisory
RHSA-2025:10343vendor-advisory
RHSA-2025:10344vendor-advisory
RHSA-2025:10346vendor-advisory
RHSA-2025:10347vendor-advisory
RHSA-2025:10348vendor-advisory
RHSA-2025:10349vendor-advisory
RHSA-2025:10350vendor-advisory
RHSA-2025:10351vendor-advisory
RHSA-2025:10352vendor-advisory
RHSA-2025:10355vendor-advisory
RHSA-2025:10356vendor-advisory
RHSA-2025:10360vendor-advisory
RHSA-2025:10370vendor-advisory
RHSA-2025:10374vendor-advisory
RHSA-2025:10375vendor-advisory
RHSA-2025:10376vendor-advisory
RHSA-2025:10377vendor-advisory
RHSA-2025:10378vendor-advisory
RHSA-2025:10381vendor-advisory
RHSA-2025:10410vendor-advisory
RHSA-2025:9303vendor-advisory
RHSA-2025:9304vendor-advisory
RHSA-2025:9305vendor-advisory
RHSA-2025:9306vendor-advisory
RHSA-2025:9392vendor-advisory
RHSA-2025:9964vendor-advisory
https://access.redhat.com/security/cve/CVE-2025-49178vdb-entry
RHBZ#2369977issue-tracking
https://gitlab.freedesktop.org/xorg/xserver/-/commit/d55c54cecb5e83eaa2d56bed5cc4461f9ba318c2
https://www.x.org/wiki/Development/Security/
https://lists.debian.org/debian-lts-announce/2025/06/msg00028.html

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