Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: fuse-uring: make a fuse_req on SQE commit only findable after memcpy Bad userspace might try to trick us and send commit SQEs request unique / commit-id of requests that are not even send to fuse-server (io_uring_cmd_done() not called) yet. fuse_uring_commit_fetch() ends the fuse request when the ring entry has a wrong state, but that could have caused a use-after-free with the memcpy operations in fuse_uring_send_in_task(). In order to avoid such races the call of fuse_uring_add_to_pq() is moved after the copy operations and just before completing the io-uring request - malicious userspace cannot find the request anymore until all prepration work in fuse-client/kernel is completed. This also moves fuse_uring_add_to_pq() a bit up in the code to avoid a forward declaration. Also not with a preparation commit, to make it easier to back port to older kernels.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected c090c8abae4b6b77a1bee116aa6c385456ebef96 before e1711479e9068ea31b31353a702a51e639c3d059; affected c090c8abae4b6b77a1bee116aa6c385456ebef96 before a635f427d57e2012102ae4886b48d8955c59fb86; affected c090c8abae4b6b77a1bee116aa6c385456ebef96 before 1efd3d474fc0ba74dfd984249bca78807d739812 |
| Linux / Linux | affected 6.14; unaffected 0 before 6.14; unaffected 6.18.39 through 6.18.*; unaffected 7.1.4 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.