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Search & fact check with cited sources for What is the "RefluXFS" Linux kernel vulnerability (CVE 2026 64600), how does it work, which systems are affected, and what is the remediation?
RefluXFS (CVE 2026 64600) is a high severity local privilege escalation vulnerability in the Linux kernel's XFS filesystem, disclosed by Qualys Threat Research Unit on July 22, 2026 [4]. It allows an unprivileged local user to gain root access by exploiting a race condition in the XFS copy on write (CoW) path [2][4]...
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- RefluXFS (CVE 2026 64600) is a high severity local privilege escalation vulnerability in the Linux kernel's XFS filesystem, disclosed by Qualys Threat Research Unit on July 22, 2026 [4].
- It allows an unprivileged local user to gain root access by exploiting a race condition in the XFS copy on write (CoW) path [2][4][9].
- How it works The flaw is a race condition in the xfs reflink fill cow hole and xfs reflink fill delalloc kernel helpers [8].
- These functions cycle the XFS inode lock (ILOCK) to acquire a transaction, which causes both the data fork and CoW fork mappings to become stale [8].
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RefluXFS (CVE-2026-64600) is a high-severity local privilege escalation vulnerability in the Linux kernel's XFS filesystem, disclosed by Qualys Threat Research Unit on July 22, 2026 . It allows an unprivileged local user to gain root access by exploiting a race condition in the XFS copy-on-write (CoW) path .
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What is the short answer to "Search & fact check with cited sources for What is the "RefluXFS" Linux kernel vulnerability (CVE 2026 64600), how does it work, which systems are affected, and what is the remediation?"?
RefluXFS (CVE 2026 64600) is a high severity local privilege escalation vulnerability in the Linux kernel's XFS filesystem, disclosed by Qualys Threat Research Unit on July 22, 2026 [4].
What are the key points to validate first?
RefluXFS (CVE 2026 64600) is a high severity local privilege escalation vulnerability in the Linux kernel's XFS filesystem, disclosed by Qualys Threat Research Unit on July 22, 2026 [4]. It allows an unprivileged local user to gain root access by exploiting a race condition in the XFS copy on write (CoW) path [2][4][9].
What should I do next in practice?
How it works The flaw is a race condition in the xfs reflink fill cow hole and xfs reflink fill delalloc kernel helpers [8].