CVE-2024-21885: Red Hat Enterprise Linux 6

High severity, CVSS 7.8. EPSS: 1.4% chance of exploitation in the next 30 days.

A flaw was found in X.Org server. In the XISendDeviceHierarchyEvent function, it is possible to exceed the allocated array length when certain new device IDs are added to the xXIHierarchyInfo struct. This can trigger a heap buffer overflow condition, which may lead to an application crash or remote code execution in SSH X11 forwarding environments.

Affected products

  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 6 Extended Lifecycle Support - Extension: before 0:1.1.0-25.el6_10.13 (fixed in 0:1.1.0-25.el6_10.13)
  • Red Hat Red Hat Enterprise Linux 7: before 0:1.20.4-27.el7_9 (fixed in 0:1.20.4-27.el7_9); before 0:1.8.0-31.el7_9 (fixed in 0:1.8.0-31.el7_9)
  • Red Hat Red Hat Enterprise Linux 8: before 0:1.13.1-2.el8_9.7 (fixed in 0:1.13.1-2.el8_9.7); before 0:1.20.11-22.el8 (fixed in 0:1.20.11-22.el8); before 0:21.1.3-15.el8 (fixed in 0:21.1.3-15.el8)
  • Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support: before 0:1.9.0-15.el8_2.9 (fixed in 0:1.9.0-15.el8_2.9)
  • Red Hat Red Hat Enterprise Linux 8.2 Telecommunications Update Service: before 0:1.9.0-15.el8_2.9 (fixed in 0:1.9.0-15.el8_2.9)
  • Red Hat Red Hat Enterprise Linux 8.2 Update Services For SAP Solutions: before 0:1.9.0-15.el8_2.9 (fixed in 0:1.9.0-15.el8_2.9)
  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support: before 0:1.11.0-8.el8_4.8 (fixed in 0:1.11.0-8.el8_4.8)
  • Red Hat Red Hat Enterprise Linux 8.4 Telecommunications Update Service: before 0:1.11.0-8.el8_4.8 (fixed in 0:1.11.0-8.el8_4.8)
  • Red Hat Red Hat Enterprise Linux 8.4 Update Services For SAP Solutions: before 0:1.11.0-8.el8_4.8 (fixed in 0:1.11.0-8.el8_4.8)
  • Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support: before 0:1.12.0-6.el8_6.9 (fixed in 0:1.12.0-6.el8_6.9)
  • Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support: before 0:1.12.0-15.el8_8.7 (fixed in 0:1.12.0-15.el8_8.7)
  • Red Hat Red Hat Enterprise Linux 9: before 0:1.13.1-3.el9_3.6 (fixed in 0:1.13.1-3.el9_3.6); before 0:1.20.11-24.el9 (fixed in 0:1.20.11-24.el9); before 0:22.1.9-5.el9 (fixed in 0:22.1.9-5.el9)
  • Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support: before 0:1.11.0-22.el9_0.8 (fixed in 0:1.11.0-22.el9_0.8)
  • Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support: before 0:1.12.0-14.el9_2.5 (fixed in 0:1.12.0-14.el9_2.5)

Published 2024-02-28. Last modified 2026-06-17.