Summary
Virtual Network Computing (VNC) is a remote display system which allows users to view a computing desktop environment not only on the machine where it is running, but from anywhere on the Internet and from a wide variety of machine architectures. TigerVNC is a suite of VNC servers and clients.
Security Fix(es):
* xorg: xmayland: Use-after-free in XPresentNotify structure creation (CVE-2025-62229)
* xorg: xwayland: Use-after-free in Xkb client resource removal (CVE-2025-62230)
* xorg: xmayland: Value overflow in XkbSetCompatMap() (CVE-2025-62231)
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 7
| Release | Package | Fixed in |
|---|---|---|
| AlmaLinux · 8 | tigervnc | 1.15.0-8.el8_10 |
| AlmaLinux · 8 | tigervnc-icons | 1.15.0-8.el8_10 |
| AlmaLinux · 8 | tigervnc-license | 1.15.0-8.el8_10 |
| AlmaLinux · 8 | tigervnc-selinux | 1.15.0-8.el8_10 |
| AlmaLinux · 8 | tigervnc-server | 1.15.0-8.el8_10 |
| AlmaLinux · 8 | tigervnc-server-minimal | 1.15.0-8.el8_10 |
| AlmaLinux · 8 | tigervnc-server-module | 1.15.0-8.el8_10 |
Vulnerabilities 3
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High 7.3
Xorg: xmayland: use-after-free in xpresentnotify structure creation
A flaw was found in the X.Org X server and Xwayland when processing X11 Present extension notifications. Improper error handling during notification creation can leave dangling pointers that lead to a use-after-free condition. This can cause memory corruption…
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High 7.3
Xorg: xwayland: use-after-free in xkb client resource removal
A flaw was discovered in the X.Org X server’s X Keyboard (Xkb) extension when handling client resource cleanup. The software frees certain data structures without properly detaching related resources, leading to a use-after-free condition. This can cause memo…
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High 7.3
Xorg: xmayland: value overflow in xkbsetcompatmap()
A flaw was identified in the X.Org X server’s X Keyboard (Xkb) extension where improper bounds checking in the XkbSetCompatMap() function can cause an unsigned short overflow. If an attacker sends specially crafted input data, the value calculation may overfl…
References
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report
https://access.redhat.com/security/cve/CVE-2025-62229
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report
https://access.redhat.com/security/cve/CVE-2025-62230
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report
https://access.redhat.com/security/cve/CVE-2025-62231
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report
https://bugzilla.redhat.com/2402649
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report
https://bugzilla.redhat.com/2402653
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report
https://bugzilla.redhat.com/2402660
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advisory
https://errata.almalinux.org/8/ALSA-2025-19909.html