Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: nvme-tcp: reject a read that transferred too few bytes nvme_tcp_recv_data() completes a request once the current C2HData PDU has been consumed. Nothing compares the total bytes received against the length the command asked for: struct nvme_tcp_request has no receive-side counter, queue->data_remaining is per queue, and blk_mq_end_request() completes for blk_rq_bytes(rq) unconditionally with no residual concept anywhere above. A controller can therefore answer a 4096-byte read with 512 bytes and have it reported as a complete read; user space then gets 4096 bytes of which 3584 are whatever was already in the page. I reproduced that with a test target. Count the bytes received and refuse to complete a successful read whose count does not match, at the two NVME_TCP_F_DATA_SUCCESS paths and in nvme_tcp_process_nvme_cqe(). The success test shifts req->status right by one, because the driver keeps the wire value there and shifts it on completion, so the check must see what the completion path will see. Only REQ_OP_READ is checked, because there the length comes from the sectors the request covers; a passthrough command is built by its submitter, which picks both command and buffer, so the kernel has nothing to compare against.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 3f2304f8c6d6ed97849057bd16fee99e434ca796 before a5c1bb0fb1bab2f24a081339c145870697f6d220; affected 3f2304f8c6d6ed97849057bd16fee99e434ca796 before aa107e3a68f4af177d60f2d87679e7f67179a36c; affected 3f2304f8c6d6ed97849057bd16fee99e434ca796 before fca3ebb63e5c82561cd9934365dcc0d068008006; affected 3f2304f8c6d6ed97849057bd16fee99e434ca796 before 99066cf9bba175f610ceb61a35f6fc9fbc33ff65; affected 3f2304f8c6d6ed97849057bd16fee99e434ca796 before 8a02ad98798fd01f51f648c1fdd8f3c9d07195d3; affected 3f2304f8c6d6ed97849057bd16fee99e434ca796 before 832a685efeb5d925ee7d30011d2dbe45f81447a3; affected 3f2304f8c6d6ed97849057bd16fee99e434ca796 before 7fa3f73f6c8ddc5f0425b50fb2a626a782ef7d12 |
| Linux / Linux | affected 5.0; unaffected 0 before 5.0; unaffected 5.15.221 through 5.15.*; unaffected 6.1.188 through 6.1.*; unaffected 6.6.157 through 6.6.*; unaffected 6.12.109 through 6.12.*; unaffected 6.18.50 through 6.18.*; unaffected 7.2.4 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/a5c1bb0fb1bab2f24a081339c145870697f6d220
- https://git.kernel.org/stable/c/aa107e3a68f4af177d60f2d87679e7f67179a36c
- https://git.kernel.org/stable/c/fca3ebb63e5c82561cd9934365dcc0d068008006
- https://git.kernel.org/stable/c/99066cf9bba175f610ceb61a35f6fc9fbc33ff65
- https://git.kernel.org/stable/c/8a02ad98798fd01f51f648c1fdd8f3c9d07195d3
- https://git.kernel.org/stable/c/832a685efeb5d925ee7d30011d2dbe45f81447a3
- https://git.kernel.org/stable/c/7fa3f73f6c8ddc5f0425b50fb2a626a782ef7d12
ADP enrichment
No English description supplied.
No references supplied.