Memory Access Vulnerability in Linux Kernel Affecting x86 Architectures

CVE-2023-53749

What is CVE-2023-53749?

A vulnerability exists in the Linux Kernel impacting x86 architectures due to incorrect exception handling annotations in the clear_user_rep_good() function. This flaw can lead to improper user memory access handling, causing a kernel oops report instead of the expected -EFAULT response when an exception occurs. The error arises from a misaligned exception table, which does not correctly reference the instruction that triggers the user access, resulting in misleading kernel crash reports that appear as filesystem issues rather than a code anomaly.

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