What is RHSA-2026:52398?

RHSA-2026:52398 is a security advisory published by Red Hat Product Security with High severity. Red Hat Security Advisory: xorg-x11-server-Xwayland security update

Which CVE IDs does RHSA-2026:52398 cover?

RHSA-2026:52398 covers the following CVE IDs: CVE-2026-55999, CVE-2026-56000. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of RHSA-2026:52398?

RHSA-2026:52398 has a CVSS v3 base score of 7.5, published by Red Hat Product Security.

Which products are affected by RHSA-2026:52398?

RHSA-2026:52398 affects 14 products, including: Red Hat Enterprise Linux AppStream E4S (v.9.4); xorg-x11-server-Xwayland-0:22.1.9-8.el9_4.3.aarch64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4); xorg-x11-server-Xwayland-0:22.1.9-8.el9_4.3.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4); xorg-x11-server-Xwayland-0:22.1.9-8.el9_4.3.s390x as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4); xorg-x11-server-Xwayland-0:22.1.9-8.el9_4.3.src as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4); and others — see the full list on the advisory page.

RHSA-2026:52398HighCVSS 7.5

Red Hat Security Advisory: xorg-x11-server-Xwayland security update

Vendor

Red Hat Product Security

Published

August 10, 2026

Last Modified

August 11, 2026

🔗 CVE IDs covered (2)

CVE-2026-55999 →CVE-2026-56000 →

📋 Description

CVE-2026-55999 — xorg: X11: xserver: X.org: glamor Font Atlas Heap Buffer Overflow CVE-2026-56000 — X.org: xorg-x11-server: GLX contextTags Use-After-Free in CommonMakeCurrent()

🎯 Affected products14

Red Hat Enterprise Linux AppStream E4S (v.9.4)
xorg-x11-server-Xwayland-0:22.1.9-8.el9_4.3.aarch64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
xorg-x11-server-Xwayland-0:22.1.9-8.el9_4.3.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
xorg-x11-server-Xwayland-0:22.1.9-8.el9_4.3.s390x as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
xorg-x11-server-Xwayland-0:22.1.9-8.el9_4.3.src as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
xorg-x11-server-Xwayland-0:22.1.9-8.el9_4.3.x86_64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
xorg-x11-server-Xwayland-debuginfo-0:22.1.9-8.el9_4.3.aarch64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
xorg-x11-server-Xwayland-debuginfo-0:22.1.9-8.el9_4.3.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
xorg-x11-server-Xwayland-debuginfo-0:22.1.9-8.el9_4.3.s390x as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
xorg-x11-server-Xwayland-debuginfo-0:22.1.9-8.el9_4.3.x86_64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
xorg-x11-server-Xwayland-debugsource-0:22.1.9-8.el9_4.3.aarch64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
xorg-x11-server-Xwayland-debugsource-0:22.1.9-8.el9_4.3.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
xorg-x11-server-Xwayland-debugsource-0:22.1.9-8.el9_4.3.s390x as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
xorg-x11-server-Xwayland-debugsource-0:22.1.9-8.el9_4.3.x86_64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)

✅ Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258

🔗 CVE IDs covered (2)

📋 Description

🎯 Affected products14

✅ Remediation

🔗 References (5)