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RefluXFS漏洞全解析：Linux核心XFS文件系統嘅本地權限提升危機

RefluXFS（CVE 2026 64600）係一個高嚴重性嘅Linux核心XFS文件系統本地權限提升漏洞，由Qualys威脅研究團隊喺2026年7月22日揭露 [4]。呢個漏洞容許無權限嘅本地用戶透過XFS copy on write（CoW）路徑嘅競爭條件取得root權限 [2][4][9]。

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RefluXFS（CVE-2026-64600） 係一個高嚴重性嘅 Linux 核心 XFS 文件系統本地權限提升漏洞，由 Qualys 威脅研究團隊 喺 2026 年 7 月 22 日公開披露。呢個漏洞容許一個無權限嘅本地用戶，透過利用 XFS copy-on-write（CoW）路徑嘅一個競爭條件，取得 root 權限。

運作原理

呢個漏洞係一個 競爭條件，存在於 xfs_reflink_fill_cow_hole 同 xfs_reflink_fill_delalloc 呢兩個核心輔助函數入面。呢啲函數會循環 XFS inode 鎖（ILOCK）嚟獲取一個交易，導致 data fork 同 CoW fork 嘅映射都變得唔一致。
雖然 CoW fork 映射會透過 xfs_find_trim_cow_extent 更新，但。呢個情況容許一個並發寫入繞過 copy-on-write 過程，直接修改攻擊者本來唔應該有權限寫入嘅共享數據塊。

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「RefluXFS漏洞全解析：Linux核心XFS文件系統嘅本地權限提升危機」的簡短答案是什麼？

RefluXFS（CVE 2026 64600）係一個高嚴重性嘅Linux核心XFS文件系統本地權限提升漏洞，由Qualys威脅研究團隊喺2026年7月22日揭露 [4]。

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接下來在實務上我該做什麼？

漏洞成因係xfs reflink fill cow hole同xfs reflink fill delalloc呢兩個核心輔助函數嘅競爭條件 [8]。