CVE-2025-49176
Xorg-x11-server-xwayland: xorg-x11-server: tigervnc: integer overflow in big requests extension
CVSS Score
7.3
EPSS Score
0.0%
EPSS Percentile
0th
A flaw was found in the Big Requests extension. The request length is multiplied by 4 before checking against the maximum allowed size, potentially causing an integer overflow and bypassing the size check.
| CWE | CWE-190 |
| Vendor | x.org |
| Product | xwayland |
| Published | Jun 17, 2025 |
| Last Updated | Dec 11, 2025 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
High
Availability
High
Affected Versions
X.Org / xwayland
0 < 24.1.7
Red Hat / Red Hat Enterprise Linux 10
All versions affected Red Hat / Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION
All versions affected Red Hat / Red Hat Enterprise Linux 7.7 Advanced Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 7 Extended Lifecycle Support
All versions affected Red Hat / Red Hat Enterprise Linux 7 Extended Lifecycle Support
All versions affected Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 8.2 Advanced Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 8.2 Advanced Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
All versions affected Red Hat / Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
All versions affected Red Hat / Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
All versions affected Red Hat / Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
All versions affected Red Hat / Red Hat Enterprise Linux 8.6 Telecommunications Update Service
All versions affected Red Hat / Red Hat Enterprise Linux 8.6 Telecommunications Update Service
All versions affected Red Hat / Red Hat Enterprise Linux 8.6 Telecommunications Update Service
All versions affected Red Hat / Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions
All versions affected Red Hat / Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions
All versions affected Red Hat / Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions
All versions affected Red Hat / Red Hat Enterprise Linux 8.8 Extended Update Support Long-Life Add-On
All versions affected Red Hat / Red Hat Enterprise Linux 8.8 Extended Update Support Long-Life Add-On
All versions affected Red Hat / Red Hat Enterprise Linux 8.8 Telecommunications Update Service
All versions affected Red Hat / Red Hat Enterprise Linux 8.8 Telecommunications Update Service
All versions affected Red Hat / Red Hat Enterprise Linux 8.8 Telecommunications Update Service
All versions affected Red Hat / Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
All versions affected Red Hat / Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
All versions affected Red Hat / Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions
All versions affected Red Hat / Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions
All versions affected Red Hat / Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions
All versions affected Red Hat / Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
All versions affected Red Hat / Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
All versions affected Red Hat / Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
All versions affected Red Hat / Red Hat Enterprise Linux 9.4 Extended Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 9.4 Extended Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 9.4 Extended Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 6
All versions affected References
access.redhat.com: https://access.redhat.com/errata/RHSA-2025:10258 access.redhat.com: https://access.redhat.com/errata/RHSA-2025:10342 access.redhat.com: https://access.redhat.com/errata/RHSA-2025:10343 access.redhat.com: https://access.redhat.com/errata/RHSA-2025:10344 access.redhat.com: https://access.redhat.com/errata/RHSA-2025:10346 access.redhat.com: https://access.redhat.com/errata/RHSA-2025:10347 access.redhat.com: https://access.redhat.com/errata/RHSA-2025:10348 access.redhat.com: https://access.redhat.com/errata/RHSA-2025:10349 access.redhat.com: https://access.redhat.com/errata/RHSA-2025:10350 access.redhat.com: https://access.redhat.com/errata/RHSA-2025:10351 access.redhat.com: https://access.redhat.com/errata/RHSA-2025:10352 access.redhat.com: https://access.redhat.com/errata/RHSA-2025:10355 access.redhat.com: https://access.redhat.com/errata/RHSA-2025:10356 access.redhat.com: https://access.redhat.com/errata/RHSA-2025:10360 access.redhat.com: https://access.redhat.com/errata/RHSA-2025:10370 access.redhat.com: https://access.redhat.com/errata/RHSA-2025:10374 access.redhat.com: https://access.redhat.com/errata/RHSA-2025:10375 access.redhat.com: https://access.redhat.com/errata/RHSA-2025:10376 access.redhat.com: https://access.redhat.com/errata/RHSA-2025:10377 access.redhat.com: https://access.redhat.com/errata/RHSA-2025:10378 access.redhat.com: https://access.redhat.com/errata/RHSA-2025:10381 access.redhat.com: https://access.redhat.com/errata/RHSA-2025:10410 access.redhat.com: https://access.redhat.com/errata/RHSA-2025:9303 access.redhat.com: https://access.redhat.com/errata/RHSA-2025:9304 access.redhat.com: https://access.redhat.com/errata/RHSA-2025:9305 access.redhat.com: https://access.redhat.com/errata/RHSA-2025:9306 access.redhat.com: https://access.redhat.com/errata/RHSA-2025:9392 access.redhat.com: https://access.redhat.com/errata/RHSA-2025:9964 access.redhat.com: https://access.redhat.com/security/cve/CVE-2025-49176 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2369954 gitlab.freedesktop.org: https://gitlab.freedesktop.org/xorg/xserver/-/commit/03731b326a80b582e48d939fe62cb1e2b10400d9 gitlab.freedesktop.org: https://gitlab.freedesktop.org/xorg/xserver/-/commit/4fc4d76b2c7aaed61ed2653f997783a3714c4fe1 x.org: https://www.x.org/wiki/Development/Security/ openwall.com: http://www.openwall.com/lists/oss-security/2025/06/18/2 lists.debian.org: https://lists.debian.org/debian-lts-announce/2025/06/msg00028.html
Credits
Red Hat would like to thank Julian Suleder and Nils Emmerich for reporting this issue.