Null Pointer Dereference in Linux Kernel RAID10 Functionality

CVE-2023-53380

What is CVE-2023-53380?

A vulnerability within the Linux kernel affects the RAID10 implementation, specifically involving the handling of the 'mreplace' variable. An improper management of the 'need_replace' and 'mreplace' checks may lead to a null pointer dereference, which could be exploited under certain conditions. The flaw arises when the status of 'mreplace' changes between checks without a corresponding update to 'need_replace'. This issue has been addressed by consolidating the checks for 'mreplace', ensuring improved stability and security within the RAID10 synchronization requests.

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