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

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Summary

CVECVE-2025-49178
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-06-17 15:15:45 UTC
Updated2026-06-30 11:16:20 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.001990000 probability, percentile 0.099060000 (date 2026-07-03)

Problem Types: CWE-667 | CWE-667 Improper Locking

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1CNACVSS5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA X.Org Xwayland affected 24.1.7 semver Not specified
CNA Red Hat Red Hat Enterprise Linux 10 unaffected 0:24.1.5-4.el10_0 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION unaffected 0:1.1.0-25.el6_10.1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 7.7 Advanced Update Support unaffected 0:1.8.0-17.el7_7.1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support unaffected 0:1.20.4-32.el7_9 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support unaffected 0:1.8.0-36.el7_9.2 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8 unaffected 0:1.20.11-26.el8_10 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8 unaffected 0:21.1.3-18.el8_10 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8 unaffected 0:1.15.0-7.el8_10 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support unaffected 0:1.9.0-15.el8_2.14 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support unaffected 0:1.20.6-4.el8_2 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support unaffected 0:1.20.10-2.el8_4 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support unaffected 0:1.11.0-8.el8_4.13 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On unaffected 0:1.20.10-2.el8_4 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On unaffected 0:1.11.0-8.el8_4.13 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support unaffected 0:1.12.0-6.el8_6.14 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support unaffected 0:21.1.3-2.el8_6.4 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support unaffected 0:1.20.11-5.el8_6.3 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On unaffected 0:1.12.0-6.el8_6.14 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On unaffected 0:21.1.3-2.el8_6.4 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service unaffected 0:1.12.0-6.el8_6.14 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service unaffected 0:21.1.3-2.el8_6.4 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service unaffected 0:1.20.11-5.el8_6.3 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.6 Update Services For SAP Solutions unaffected 0:1.12.0-6.el8_6.14 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.6 Update Services For SAP Solutions unaffected 0:21.1.3-2.el8_6.4 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.6 Update Services For SAP Solutions unaffected 0:1.20.11-5.el8_6.3 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support Long-Life Add-On unaffected 0:1.20.11-16.el8_8 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support Long-Life Add-On unaffected 0:21.1.3-11.el8_8 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service unaffected 0:1.20.11-16.el8_8 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service unaffected 0:1.12.0-15.el8_8.14 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service unaffected 0:21.1.3-11.el8_8 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.8 Update Services For SAP Solutions unaffected 0:1.20.11-16.el8_8 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.8 Update Services For SAP Solutions unaffected 0:1.12.0-15.el8_8.14 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.8 Update Services For SAP Solutions unaffected 0:21.1.3-11.el8_8 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9 unaffected 0:1.20.11-31.el9_6 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9 unaffected 0:23.2.7-4.el9_6 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9 unaffected 0:1.14.1-8.el9_6 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.0 Update Services For SAP Solutions unaffected 0:21.1.3-3.el9_0 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.0 Update Services For SAP Solutions unaffected 0:1.20.11-11.el9_0 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.0 Update Services For SAP Solutions unaffected 0:1.11.0-22.el9_0.15 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.2 Update Services For SAP Solutions unaffected 0:21.1.3-8.el9_2 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.2 Update Services For SAP Solutions unaffected 0:1.20.11-18.el9_2 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.2 Update Services For SAP Solutions unaffected 0:1.12.0-14.el9_2.12 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support unaffected 0:22.1.9-6.el9_4 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support unaffected 0:1.20.11-26.el9_4 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support unaffected 0:1.13.1-8.el9_4.7 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 6 Not specified Not specified

References

ReferenceSourceLinkTags
access.redhat.com/errata/RHSA-2025:10375 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2025:9304 [email protected] access.redhat.com
bugzilla.redhat.com/show_bug.cgi [email protected] bugzilla.redhat.com
www.x.org/wiki/Development/Security [email protected] www.x.org
access.redhat.com/security/cve/CVE-2025-49178 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2025:10374 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2025:10356 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2025:10381 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2025:10378 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2025:9392 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2025:9964 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2025:10360 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2025:10342 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2025:10377 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2025:10355 [email protected] access.redhat.com
gitlab.freedesktop.org/xorg/xserver/-/commit/d55c54cecb5e83eaa2d56bed5cc4461f9ba318c2 [email protected] gitlab.freedesktop.org
access.redhat.com/errata/RHSA-2025:10376 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2025:10343 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2025:9306 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2025:10410 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2025:10349 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2025:10352 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2025:10370 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2025:10348 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2025:10344 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2025:9305 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2025:10347 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2025:10350 [email protected] access.redhat.com
lists.debian.org/debian-lts-announce/2025/06/msg00028.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
access.redhat.com/errata/RHSA-2025:9303 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2025:10258 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2025:10351 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2025:10346 [email protected] access.redhat.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

SourceTimeEvent
CNA2025-06-03T10:00:49.274ZReported to Red Hat.
CNA2025-06-17T00:00:00.000ZMade public.

Workarounds

CNA: Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

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