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RefluXFS — CVE-2026-64600

name
RefluXFS — CVE-2026-64600
source
Notion Canonical Resource Hub
source_added
August 8, 2026
category
Cybersecurity
license
Security advisory / CVE reference
priority
EXTREMELY HIGH
official_or_repo_url
https://nvd.nist.gov/vuln/detail/CVE-2026-64600
migration_status
Imported
testing_status
Not Assumed
tags
csi-resource-hub, notion-migration
06-Cybersecurity/RefluXFS — CVE-2026-64600.md

RefluXFS — CVE-2026-64600

Purpose / CSI Use Case

Linux/XFS local privilege-escalation vulnerability watch and emergency patching reference for servers, multi-tenant hosts, CI runners and systems where untrusted local code can execute.

Source Notes

Verified as CVE-2026-64600. RefluXFS affects vulnerable Linux kernels using XFS with reflink enabled and can allow an unprivileged local user to overwrite root-owned file data while preserving file metadata characteristics, enabling persistent privilege escalation. The issue traces to Linux 4.11-era code; the fix was merged in July 2026 and vendors have begun shipping backports. Exposure requires an unpatched kernel, XFS created with reflink=1, and attacker-writable and readable target locations on the same XFS filesystem. RHEL-family systems, Fedora Server and Amazon Linux are important exposure candidates because XFS/reflink configurations can be common; Ubuntu/Debian are not generally XFS-root by default but can be exposed when XFS reflink was selected. CSI action: inventory XFS filesystems, check reflink feature and exact kernel/vendor advisory status, prioritize Internet-facing/multi-user/CI/container hosts where local code can execute, patch/reboot into the fixed kernel, then verify running kernel. Do not assume a sysctl or mount-option workaround; published reporting states no practical post-creation reflink disable mitigation. Sources: NVD CVE-2026-64600 and The Hacker News report dated 2026-07-23.

Official / Repository URL

https://nvd.nist.gov/vuln/detail/CVE-2026-64600

Legacy Metadata

  • Added: August 8, 2026
  • Category: Cybersecurity
  • License: Security advisory / CVE reference
  • Priority: EXTREMELY HIGH

Migration Notes

Imported deterministically from the canonical CSI Resource Hub Notion export.

No testing, deployment, approval, or production status has been inferred during migration.

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