CVE-2026-18917: Red Hat Enterprise Linux 10

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

A flaw was found in libvirt. An unprivileged local user could exploit an integer overflow vulnerability in the NodeGetFreePages RPC handler. This flaw allows crafted values to bypass a size check, leading to an undersized memory buffer. Subsequently, real NUMA node data can overwrite this buffer. This heap buffer overflow can corrupt the root libvirt daemon's memory, potentially leading to a denial of service or local privilege escalation.

Affected products

  • Red Hat Red Hat Enterprise Linux 10: before 0:11.10.0-12.9.el10_2 (fixed in 0:11.10.0-12.9.el10_2)
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support: before 0:10.10.0-8.12.el10_0 (fixed in 0:10.10.0-8.12.el10_0)
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support: before 0:4.5.0-36.el7_9.7 (fixed in 0:4.5.0-36.el7_9.7)
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support: before 8040020260916092751.522a0ee4 (fixed in 8040020260916092751.522a0ee4)
  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On: before 8040020260916092751.522a0ee4 (fixed in 8040020260916092751.522a0ee4)
  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support: before 8060020260910092451.ad008a3a (fixed in 8060020260910092451.ad008a3a)
  • Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On: before 8060020260910092451.ad008a3a (fixed in 8060020260910092451.ad008a3a)
  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service: before 8080020260910092120.63b34585 (fixed in 8080020260910092120.63b34585)
  • Red Hat Red Hat Enterprise Linux 8.8 Update Services For SAP Solutions: before 8080020260910092120.63b34585 (fixed in 8080020260910092120.63b34585)
  • Red Hat Red Hat Enterprise Linux 9: before 0:11.10.0-12.7.el9_8 (fixed in 0:11.10.0-12.7.el9_8)
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services For SAP Solutions: before 0:9.0.0-10.17.el9_2 (fixed in 0:9.0.0-10.17.el9_2)
  • Red Hat Red Hat Enterprise Linux 9.4 Update Services For SAP Solutions: before 0:10.0.0-6.24.el9_4 (fixed in 0:10.0.0-6.24.el9_4)
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support: before 0:10.10.0-7.19.el9_6 (fixed in 0:10.10.0-7.19.el9_6)
  • Red Hat Red Hat Enterprise Linux For NVIDIA 26

Published 2026-08-20. Last modified 2026-10-05.