fuse filesystem

About this tag
The FUSE (Filesystem in Userspace) framework allows unprivileged users to implement filesystems in userland processes, with fuseblk being the b-device style variant. A recent thread on WindowsForum.com discusses CVE-2025-40220, a livelock vulnerability in the Linux FUSE stack that can freeze I/O workers. The fix addresses a pathological interaction between AIO-driven client behavior and fuseblk server threads by converting synchronous file-put operations to asynchronous ones, breaking a self-referential wait loop that could exhaust all server threads and make the filesystem unresponsive. This content is relevant for users interested in Linux FUSE filesystem resilience and security patches.

  1. CVE-2025-40220 Linux FUSE livelock fix for fuseblk I/O resilience

    A livelock in the Linux FUSE stack that can freeze I/O workers has been fixed upstream: CVE‑2025‑40220 patches a pathological interaction between AIO-driven client behavior and fuseblk server threads by turning synchronous file‑put operations into asynchronous ones to break a self‑referential...
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    • availability concurrency fuse filesystem linux kernel
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    • Forum: Security Alerts