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RefluXFS: A Linux Kernel Local Privilege Escalation to Root in XFS (CVE-2026-64600)

·Source: Qualys Blog

Updated:

Executive Summary

Executive summary Qualys Threat Research Unit (TRU) identified CVE-2026-64600, a race condition in the Linux kernel’s XFS filesystem copy-on-write path. An attacker with an ordinary local account can exploit this race condition to overwrite protected files on disk and gain host root privileges on affected systems, including deployments running SELinux in Enforcing mode. This discovery […]

Analysis

Executive summary Qualys Threat Research Unit (TRU) identified CVE-2026-64600, a race condition in the Linux kernel’s XFS filesystem copy-on-write path. An attacker with an ordinary local account can exploit this race condition to overwrite protected files on disk and gain host root privileges on affected systems, including deployments running SELinux in Enforcing mode. This discovery […]

Indicators of Compromise (1)

CVE (1)
CVE-2026-64600
NVDMITRE CVE
Source Attribution

Originally published by Qualys Blog on Jul 22, 2026.

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