Summary
X.Org is an open-source implementation of the X Window System. It provides the basic low-level functionality that full-fledged graphical user interfaces are designed upon.
Security Fix(es):
* xorg-x11-server-Xwayland: xorg-x11-server: tigervnc: Out-of-Bounds Read in X Rendering Extension Animated Cursors (CVE-2025-49175)
* xorg-x11-server-Xwayland: xorg-x11-server: tigervnc: Integer Overflow in Big Requests Extension (CVE-2025-49176)
* xorg-x11-server-Xwayland: xorg-x11-server: tigervnc: Unprocessed Client Request Due to Bytes to Ignore (CVE-2025-49178)
* xorg-x11-server-Xwayland: xorg-x11-server: tigervnc: Integer overflow in X Record extension (CVE-2025-49179)
* xorg-x11-server-Xwayland: xorg-x11-server: tigervnc: Integer Overflow in X Resize, Rotate and Reflect (RandR) Extension (CVE-2025-49180)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Fixed packages 9
| Release | Package | Fixed in |
|---|---|---|
| AlmaLinux · 8 | xorg-x11-server-common | 1.20.11-26.el8_10 |
| AlmaLinux · 8 | xorg-x11-server-devel | 1.20.11-26.el8_10 |
| AlmaLinux · 8 | xorg-x11-server-source | 1.20.11-26.el8_10 |
| AlmaLinux · 8 | xorg-x11-server-Xdmx | 1.20.11-26.el8_10 |
| AlmaLinux · 8 | xorg-x11-server-Xephyr | 1.20.11-26.el8_10 |
| AlmaLinux · 8 | xorg-x11-server-Xnest | 1.20.11-26.el8_10 |
| AlmaLinux · 8 | xorg-x11-server-Xorg | 1.20.11-26.el8_10 |
| AlmaLinux · 8 | xorg-x11-server-Xvfb | 1.20.11-26.el8_10 |
| AlmaLinux · 8 | xorg-x11-server-Xwayland | 21.1.3-18.el8_10 |
Vulnerabilities 5
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High 7.8
Xorg-x11-server-xwayland: xorg-x11-server: tigervnc: integer overflow in x resize, rotate and reflect (randr) extension
A flaw was found in the RandR extension, where the RRChangeProviderProperty function does not properly validate input. This issue leads to an integer overflow when computing the total size to allocate.
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High 7.3
Xorg-x11-server-xwayland: xorg-x11-server: tigervnc: integer overflow in big requests extension
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.
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High 7.3
Xorg-x11-server-xwayland: xorg-x11-server: tigervnc: integer overflow in x record extension
A flaw was found in the X Record extension. The RecordSanityCheckRegisterClients function does not check for an integer overflow when computing request length, which allows a client to bypass length checks.
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Medium 6.1
Xorg-x11-server-xwayland: xorg-x11-server: tigervnc: out-of-bounds read in x rendering extension animated cursors
A flaw was found in the X Rendering extension's handling of animated cursors. If a client provides no cursors, the server assumes at least one is present, leading to an out-of-bounds read and potential crash.
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Medium 5.5
Xorg-x11-server-xwayland: xorg-x11-server: tigervnc: unprocessed client request due to bytes to ignore
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.
References
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report
https://access.redhat.com/security/cve/CVE-2025-49175
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report
https://access.redhat.com/security/cve/CVE-2025-49176
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report
https://access.redhat.com/security/cve/CVE-2025-49178
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report
https://access.redhat.com/security/cve/CVE-2025-49179
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report
https://access.redhat.com/security/cve/CVE-2025-49180
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report
https://bugzilla.redhat.com/2369947
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report
https://bugzilla.redhat.com/2369954
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report
https://bugzilla.redhat.com/2369977
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report
https://bugzilla.redhat.com/2369978
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report
https://bugzilla.redhat.com/2369981
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advisory
https://errata.almalinux.org/8/ALSA-2025-9305.html