NULL Pointer Dereference Vulnerability in Linux Kernel Bcache Functionality

CVE-2025-38263

What is CVE-2025-38263?

A vulnerability exists in the Linux kernel's bcache subsystem, where a NULL pointer dereference can occur during the execution of caching functions. This issue arises when certain memory allocations fail, leading to an unregistered cache set and potentially crashing the system. The problem surfaces when the kernel attempts to flush cache sets without proper checks on allocated structures, resulting in crashes and unpredictable behavior. Proper coding practices and validation checks are essential to mitigate this vulnerability and ensure system stability.

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