CVE-2024-9632: Xorg-x11-server: tigervnc: heap-based buffer overflow privilege escalation vulnerability

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-10-30 · updated 2026-06-17
Weakness: CWE-122

Description

A flaw was found in the X.org server. Due to improperly tracked allocation size in _XkbSetCompatMap, a local attacker may be able to trigger a buffer overflow condition via a specially crafted payload, leading to denial of service or local privilege escalation in distributions where the X.org server is run with root privileges.

Affected products

Red Hat Enterprise Linux 10: all versions — fixed in 0:24.1.5-3.el10_0
Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION: all versions — fixed in 0:1.1.0-25.el6_10.13
Red Hat Enterprise Linux 7 Extended Lifecycle Support: all versions — fixed in 0:1.8.0-34.el7_9
Red Hat Enterprise Linux 8: all versions — fixed in 0:1.13.1-14.el8_10, 0:1.20.11-25.el8_10, 0:21.1.3-17.el8_10
Red Hat Enterprise Linux 8.2 Advanced Update Support: all versions — fixed in 0:1.9.0-15.el8_2.12
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support: all versions — fixed in 0:1.11.0-8.el8_4.11
Red Hat Enterprise Linux 8.4 Telecommunications Update Service: all versions — fixed in 0:1.11.0-8.el8_4.11
Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions: all versions — fixed in 0:1.11.0-8.el8_4.11
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support: all versions — fixed in 0:1.12.0-6.el8_6.12
Red Hat Enterprise Linux 8.6 Telecommunications Update Service: all versions — fixed in 0:1.12.0-6.el8_6.12
Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions: all versions — fixed in 0:1.12.0-6.el8_6.12
Red Hat Enterprise Linux 8.8 Extended Update Support: all versions — fixed in 0:1.12.0-15.el8_8.11
Red Hat Enterprise Linux 9: all versions — fixed in 0:1.14.1-1.el9_5, 0:1.20.11-28.el9_6, 0:23.2.7-3.el9_6
Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions: all versions — fixed in 0:1.11.0-22.el9_0.12
Red Hat Enterprise Linux 9.2 Extended Update Support: all versions — fixed in 0:1.12.0-14.el9_2.9
Red Hat Enterprise Linux 9.4 Extended Update Support: all versions — fixed in 0:1.13.1-8.el9_4.4

How to fix

Upgrade to a fixed version: Red Hat Enterprise Linux 10 0:24.1.5-3.el10_0; Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION 0:1.1.0-25.el6_10.13; Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:1.8.0-34.el7_9; Red Hat Enterprise Linux 8 0:1.13.1-14.el8_10, 0:1.20.11-25.el8_10, 0:21.1.3-17.el8_10; Red Hat Enterprise Linux 8.2 Advanced Update Support 0:1.9.0-15.el8_2.12; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:1.11.0-8.el8_4.11; Red Hat Enterprise Linux 8.4 Telecommunications Update Service 0:1.11.0-8.el8_4.11; Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions 0:1.11.0-8.el8_4.11; Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 0:1.12.0-6.el8_6.12; Red Hat Enterprise Linux 8.6 Telecommunications Update Service 0:1.12.0-6.el8_6.12; Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions 0:1.12.0-6.el8_6.12; Red Hat Enterprise Linux 8.8 Extended Update Support 0:1.12.0-15.el8_8.11. Check the vendor advisory for mitigations.

References

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