RHSA-2025:2880 — Security Advisory

An update for tigervnc is now available for Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support, Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions, and Red Hat Enterprise Linux 8.6 Telecommunications Update Service.

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.