CVE-2026-64267

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.