CVE-2024-56740

Summary

CVE-2024-56740 is a vulnerability affecting the Linux kernel's NFS (Network File System) implementation. Specifically, in the 'nfs/localio' module, there is a memory corruption issue where the 'res.replen' variable is not properly cleared in 'nfs_local_read_done'. This results in incorrect data being copied into 'server->read_hdrsize', which then affects the length of the receive buffer in subsequent read requests. The issue leads to data being read into an incorrect location, potentially causing serious security vulnerabilities or system instability. The issue can be reproduced when the NFSv3 server switches back to normal RPC operation while performing heavy read I/O.

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