RLSA-2026:98461: Important: libX11 security update
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 Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
rocky-linux/libX11to a version that resolves this vulnerability.Fixed in 0:1.8.12-1.el9_8.1
Event History
Frequently Asked Questions
What does an attacker need to exploit this issue?
Exploitation requires a user to interact with a malicious X server. The CVSS vector indicates that the attacker does not need prior privileges, but user interaction is required and attack complexity is high.
Which systems are exposed?
Systems using the Rocky Linux libX11 packages may be exposed when their X11 client applications connect to an attacker-controlled or malicious X server. The issue affects the core X11 protocol client library.
How severe is the potential impact?
The advisory rates the issue high with a CVSS score of 7.5. Successful exploitation may result in high impact to confidentiality, integrity, and availability.