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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
3f29d59e92a96d843c2ff10ebfed92ac26878658 to < 6e2d84fdeac05bfd858e84a76353fdb84f23a43eaffected3f29d59e92a96d843c2ff10ebfed92ac26878658 to < c78c4b242299bc581e4987e5c2786c6f4760c516affected3f29d59e92a96d843c2ff10ebfed92ac26878658 to < 54243797cedf55447b4c5d560e8cd709900061aeaffected
Linux Linux
Default version status: affected
6.18affected0 to < 6.18unaffected6.18.39 to ≤ 6.18.*unaffected7.1.4 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected