A vulnerability was found in libX11 due to a boundary condition within the _XkbReadKeySyms() function. This flaw allows a local user to trigger an out-of-bounds read error and read the contents of memory on the system.
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Score 6.5 from GitHub Security Advisory published 2023-10-10. NVD baseline CVSS 6.5; sources differ by 0.0.
A vulnerability was found in libX11 due to a boundary condition within the _XkbReadKeySyms() function. This flaw allows a local user to trigger an out-of-bounds read error and read the contents of memory on the system.
October 10, 2023
November 4, 2025
| Vendor / Ecosystem | Fixed in / Patch | Released | Source |
|---|---|---|---|
| ubuntu | libx11-xcb1 (2:1.8.4-2ubuntu0.3) @ lunar | 2026-05-24 | ubuntu |
| ubuntu | libx11-xcb1 (2:1.6.3-1ubuntu2.2+esm4) @ xenial | 2026-05-24 | ubuntu |
| redhat | libX11-0:1.6.8-8.el8 | 2024-05-22 | redhat |
| redhat | libX11-0:1.7.0-9.el9 | 2024-04-30 | redhat |
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.
Libx11: out-of-bounds memory access in _xkbreadkeysyms()
RHSA-2024:2145 — Moderate
RHSA-2024:2973 — Moderate
libx11 vulnerabilities
libx11 vulnerabilities
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msrc · redhat
CWE-787