CVE-2025-6021: Red Hat Enterprise Linux

High severity, CVSS 7.5. EPSS: 1.4% chance of exploitation in the next 30 days.

A flaw was found in libxml2's xmlBuildQName function, where integer overflows in buffer size calculations can lead to a stack-based buffer overflow. This issue can result in memory corruption or a denial of service when processing crafted input.

Affected products

  • Red Hat Enterprise Linux: version 8.0 only; version 9.0 only; version 10.0 only
  • Red Hat Enterprise Linux Eus: version 8.4 only; version 8.6 only; version 8.8 only; version 9.4 only; version 9.6 only; version 10.0 only
  • Red Hat Enterprise Linux For Arm 64: version 8.0_aarch64 only; version 9.0_aarch64 only; version 9.4_aarch64 only; version 10.0_aarch64 only
  • Red Hat Enterprise Linux For Arm 64 Eus: version 9.4_aarch64 only; version 9.6_aarch64 only; version 10.0_aarch64 only
  • Red Hat Enterprise Linux For IBM Z Systems: version 8.0_s390x only; version 9.4_s390x only; version 10.0_s390x only
  • Red Hat Enterprise Linux For IBM Z Systems Eus: version 9.0_s390x only; version 9.4_s390x only; version 9.6_s390x only; version 10.0_s390x only
  • Red Hat Enterprise Linux For Power Little Endian: version 8.0_ppc64le only; version 9.0_ppc64le only; version 10.0_ppc64le only
  • Red Hat Enterprise Linux For Power Little Endian Eus: version 9.4_ppc64le only; version 9.6_ppc64le only; version 10.0_ppc64le only
  • Red Hat Enterprise Linux Server: version 7.0 only
  • Red Hat Enterprise Linux Server Aus: version 8.2 only; version 8.4 only; version 8.6 only; version 9.2 only; version 9.4 only; version 9.6 only
  • Red Hat Enterprise Linux Server For Power Little Endian Update Services For SAP Solutions: version 9.4_ppc64le only
  • Red Hat Enterprise Linux Server Tus: version 8.8 only
  • Red Hat In-Vehicle Operating System: version 1.0 only
  • Red Hat JBoss Core Services: affected versions not specified
  • Red Hat Openshift Container Platform: version 4.12 only; version 4.13 only; version 4.14 only; version 4.15 only; version 4.16 only; version 4.17 only; …
  • Red Hat Openshift Container Platform For ARM64: version 4.13 only; version 4.14 only; version 4.15 only; version 4.16 only; version 4.17 only; version 4.18 only
  • Red Hat Openshift Container Platform For IBM Z: version 4.13 only; version 4.14 only; version 4.15 only; version 4.16 only; version 4.17 only; version 4.18 only
  • Red Hat Openshift Container Platform For Linuxone: version 4.13 only; version 4.14 only; version 4.15 only; version 4.16 only; version 4.17 only; version 4.18 only
  • Red Hat Openshift Container Platform For Power: version 4.13 only; version 4.14 only; version 4.15 only; version 4.16 only; version 4.17 only; version 4.18 only
  • Xmlsoft LIBXML2: before 2.14.4 (fixed in 2.14.4)

Published 2025-06-12. Last modified 2026-09-18.