CVE-2024-56740

In the Linux kernel, the following vulnerability has been resolved: nfs/localio: must clear res.replen in nfs_local_read_done Otherwise memory corruption can occur due to NFSv3 LOCALIO reads leaving garbage in res.replen: - nfs3_read_done() copies that into server->read_hdrsize; from there nfs3_proc_read_setup() copies it to args.replen in new requests. - nfs3_xdr_enc_read3args() passes that to rpc_prepare_reply_pages() which includes it in hdrsize for xdr_init_pages, so that rq_rcv_buf contains a ridiculous len. - This is copied to rq_private_buf and xs_read_stream_request() eventually passes the kvec to sock_recvmsg() which receives incoming data into entirely the wrong place. This is easily reproduced with NFSv3 LOCALIO that is servicing reads when it is made to pivot back to using normal RPC. This switch back to using normal NFSv3 with RPC can occur for a few reasons but this issue was exposed with a test that stops and then restarts the NFSv3 server while LOCALIO is performing heavy read IO.

The following products are affected by CVE-2024-56740 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2024-56740.

URL	Resource
https://git.kernel.org/stable/c/650703bc4ed3edf841e851c99ab8e7ba9e5262a3
https://git.kernel.org/stable/c/de5dac261eeab99762bbdf7c20cee5d26ef4462e
https://lore.kernel.org/linux-cve-announce/2024122925-CVE-2024-56740-6b7b@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2024-56740
https://www.cve.org/CVERecord?id=CVE-2024-56740