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RLSA-2026:91366

Security Mirrored from RHSA-2026:91366
Issued at: 2026-10-30
Updated at: 2026-10-31

Advisory content derived from Red Hat RHSA-2026:91366, © Red Hat, Inc., used under CC BY 4.0, with modifications.

Synopsis

Important: libX11 security update



Description

The libX11 packages contain the core X11 protocol client library.

Security Fix(es):

* libX11: libX11: Heap-based buffer overflow via malicious X server (CVE-2026-88806)

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.



Affected products

Rocky Linux 10 aarch64 Rocky Linux 10 ppc64le Rocky Linux 10 riscv64 Rocky Linux 10 s390x Rocky Linux 10 x86_64

Fixes

2538514

CVEs

CVE-2026-88806

Affected packages

Rocky Linux 10 aarch64 - AppStream

libX11-common-0:1.8.10-1.el10_2.1.noarch.rpm libX11-0:1.8.10-1.el10_2.1.aarch64.rpm libX11-debugsource-0:1.8.10-1.el10_2.1.aarch64.rpm libX11-xcb-0:1.8.10-1.el10_2.1.aarch64.rpm libX11-devel-0:1.8.10-1.el10_2.1.aarch64.rpm libX11-0:1.8.10-1.el10_2.1.src.rpm libX11-xcb-debuginfo-0:1.8.10-1.el10_2.1.aarch64.rpm libX11-debuginfo-0:1.8.10-1.el10_2.1.aarch64.rpm

Rocky Linux 10 ppc64le - AppStream

libX11-common-0:1.8.10-1.el10_2.1.noarch.rpm libX11-0:1.8.10-1.el10_2.1.ppc64le.rpm libX11-0:1.8.10-1.el10_2.1.src.rpm libX11-devel-0:1.8.10-1.el10_2.1.ppc64le.rpm libX11-xcb-0:1.8.10-1.el10_2.1.ppc64le.rpm libX11-debugsource-0:1.8.10-1.el10_2.1.ppc64le.rpm libX11-xcb-debuginfo-0:1.8.10-1.el10_2.1.ppc64le.rpm libX11-debuginfo-0:1.8.10-1.el10_2.1.ppc64le.rpm

Rocky Linux 10 riscv64 - AppStream

libX11-common-0:1.8.10-1.el10_2.1.noarch.rpm libX11-0:1.8.10-1.el10_2.1.src.rpm

Rocky Linux 10 s390x - AppStream

libX11-common-0:1.8.10-1.el10_2.1.noarch.rpm libX11-xcb-0:1.8.10-1.el10_2.1.s390x.rpm libX11-debugsource-0:1.8.10-1.el10_2.1.s390x.rpm libX11-0:1.8.10-1.el10_2.1.src.rpm libX11-xcb-debuginfo-0:1.8.10-1.el10_2.1.s390x.rpm libX11-0:1.8.10-1.el10_2.1.s390x.rpm libX11-devel-0:1.8.10-1.el10_2.1.s390x.rpm libX11-debuginfo-0:1.8.10-1.el10_2.1.s390x.rpm

Rocky Linux 10 x86_64 - AppStream

libX11-common-0:1.8.10-1.el10_2.1.noarch.rpm libX11-debugsource-0:1.8.10-1.el10_2.1.x86_64.rpm libX11-xcb-0:1.8.10-1.el10_2.1.x86_64.rpm libX11-devel-0:1.8.10-1.el10_2.1.x86_64.rpm libX11-xcb-debuginfo-0:1.8.10-1.el10_2.1.x86_64.rpm libX11-0:1.8.10-1.el10_2.1.x86_64.rpm libX11-0:1.8.10-1.el10_2.1.src.rpm libX11-debuginfo-0:1.8.10-1.el10_2.1.x86_64.rpm