CyberRota Analysis
AI-GeneratedThe vulnerability affects the Linux kernel's FUSE (Filesystem in Userspace) implementation, specifically in how it handles prune notifications, which can lead to an integer overflow due to improper validation of the nodeid payload length on 32-bit systems. This flaw can allow an attacker to trigger a bug in the system, potentially leading to denial of service or unexpected behavior in applications relying on FUSE. Organizations using 32-bit Linux kernels, particularly those running QEMU or similar environments, should prioritize patching this vulnerability to mitigate the associated risks.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: fuse: avoid 32-bit prune notification count wrap FUSE_NOTIFY_PRUNE validates the nodeid payload length with: size - sizeof(outarg) != outarg.count * sizeof(u64) On 32-bit kernels, size_t is also 32 bits, so the daemon-controlled count multiplication can wrap. A prune notification with count 0x20000000 and no nodeid payload passes the check, enters the copy loop, and asks the device copy path to read nodeids that are not present in the userspace write buffer. In QEMU this reaches the fuse_copy_fill() BUG_ON(!err) path. Validate the payload length with array_size() instead. That accepts exactly the same valid messages, but avoids wrapping arithmetic before the copy loop consumes the count.
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