A flaw was discovered in libvirt in the XML file processing. More specifically, the parsing of user provided XML files was performed before the ACL checks (https://libvirt.org/acl.html). A malicious user with limited permissions could exploit this flaw by submitting a specially crafted XML file, causing libvirt to allocate too much memory on the host. The excessive memory consumption could lead to a libvirt process crash on the host, resulting in a denial-of-service condition. Upstream issue: https://gitlab.com/libvirt/libvirt/-/issues/825 Patch: https://lists.libvirt.org/archives/list/devel@lists.libvirt.org/thread/LTGHU3S4JEMCF5KJNJGWWZ7F2CS6L5SG/
This issue has been addressed in the following products: Red Hat Enterprise Linux 10 Via RHSA-2026:18326 https://access.redhat.com/errata/RHSA-2026:18326
This issue has been addressed in the following products: Red Hat Enterprise Linux 9 Via RHSA-2026:18748 https://access.redhat.com/errata/RHSA-2026:18748