RHSA-2025:2875 — Security Advisory

An update for tigervnc is now available for Red Hat Enterprise Linux 9.4 Extended Update Support.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

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):

• X.Org: Xwayland: Use-after-free of the root cursor (CVE-2025-26594)

• xorg: xwayland: Use-after-free in SyncInitTrigger() (CVE-2025-26601)

• xorg: xwayland: Use-after-free in PlayReleasedEvents() (CVE-2025-26600)

• xorg: xwayland: Use of uninitialized pointer in compRedirectWindow() (CVE-2025-26599)

• xorg: xwayland: Out-of-bounds write in CreatePointerBarrierClient() (CVE-2025-26598)

• xorg: xwayland: Buffer overflow in XkbChangeTypesOfKey() (CVE-2025-26597)

• xorg: xwayland: Heap overflow in XkbWriteKeySyms() (CVE-2025-26596)

• Xorg: xwayland: Buffer overflow in XkbVModMaskText() (CVE-2025-26595)

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.