CVE-2023-40791

Summary

CVE-2023-40791 is a vulnerability affecting the Linux kernel version before 6.4.12. The issue lies in the 'extract_user_to_sg' function in 'lib/scatterlist.c'. This vulnerability results in a failure to unpin pages properly in a specific scenario, which is indicated by a 'WARNING for try_grab_page'. This flaw could potentially allow a local attacker to manipulate memory, leading to denial of service or code execution with the privileges of the affected system.

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