Out-of-bounds Access to Dirty Bitset in Linux Kernel's dm-cache

CVE-2024-50279

What is CVE-2024-50279?

The Linux kernel's dm-cache module has a vulnerability where an incorrect index during bitset iteration can lead to out-of-bounds access when resizing the dirty bitset. Specifically, when the caching device shrinks, it fails to properly validate the boundary of the dirty bits to be dropped, potentially resulting in unintended memory access. This can be exploited during operations that manipulate the cache device's size, which may lead to read/write errors and could impact system stability. It is crucial for users of affected kernel versions to implement the fixes provided in subsequent patches to mitigate any risks associated with this vulnerability.

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