Bottom line: Qualys TRU has discovered RefluXFS (CVE-2026-64600), a critical Linux kernel vulnerability that grants local users root privileges.
The Qualys Threat Research Unit (TRU) has identified a critical vulnerability in the Linux kernel named RefluXFS, tracked under the identifier CVE-2026-64600. The flaw allows a local user to obtain root privileges.
Security researchers at the Qualys Threat Research Unit have discovered a vulnerability in the Linux kernel named RefluXFS, registered as CVE-2026-64600. It allows a user with local access to escalate their privileges up to root level. The available report does not provide concrete technical details regarding the affected core component, the required kernel versions, or a CVSS score.
For enterprises, government agencies and critical infrastructure operators in the DACH region, the impact of this vulnerability is significant, as Linux and distributions based on it are widely used there as server, container, and infrastructure operating systems. A privilege escalation vulnerability in the kernel potentially affects the entire range of systems regardless of the specific distribution, provided the vulnerable kernel code is in use. Root access on compromised systems subsequently gives attackers full control, the ability to read sensitive data, and the means to establish persistent access.
CISOs should prioritize checking the patch status of their Linux systems as soon as distributors provide corresponding kernel updates, paying particular attention to systems with multiple user accounts or tenant separation, as the risk of local privilege escalation is greatest there. Until official patches are available, it is recommended to review existing mitigation measures and closely monitor advisories from Red Hat, SUSE, Canonical, and other distributors.
Source: borncity.com · Published August 3, 2026
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