Linux Kernel Vulnerability in blk-cgroup Impacting Memory Management

CVE-2023-53421

What is CVE-2023-53421?

A vulnerability in the Linux kernel pertaining to the blk-cgroup module affects proper initialization of fields within the blk_iostat_set structure. When the blkg_alloc() function is executed to allocate a blkcg_gq structure, crucial fields, blkg and sync, are not adequately initialized after clearing during the blkcg_reset_stats() process. This oversight may lead to a kernel panic due to a NULL pointer access of the blkg pointer, severely impacting system stability. Additionally, while the sync field's missing initialization poses fewer risks, it can still cause issues in debug kernel environments by lacking lockdep initialization. The vulnerability has been addressed by ensuring these fields are re-initialized following memory clearing.

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