CVE-2021-47040

Summary

CVE-2021-47040 is a recently addressed vulnerability in the Linux kernel. It affected the nio_uring component where issues with overflows in the provide buffers were identified. Colin reported potential overflow and sign extension problems in the function io_provide_buffers_prep(). Linus Torvalds acknowledged previous attempts to resolve the issue were ineffective. The vulnerability was mitigated by implementing check_<op>_overflow helpers and refining the definition of struct nio_provide_buf's len type, which was found to be ineffective in its previous signed state.

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