Executive Summary

This vulnerability exists in the Linux kernel's f2fs file system code, specifically in the function f2fs_sbi_show(). The issue is that the extension_list, extension_count, and hot_ext_count are read without holding the sb_lock. If another process concurrently modifies the extension list via f2fs_update_extension_list(), the reading process may access inconsistent or stale data. This can lead to out-of-bounds memory access or incorrect information being displayed.

The fix involves holding the sb_lock during the entire read and format operation of the extension list to ensure data consistency and prevent race conditions.

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Impact Analysis

This vulnerability can cause the Linux kernel to read inconsistent or stale data from the f2fs extension list, potentially leading to out-of-bounds memory access. Such behavior may result in system instability, crashes, or unexpected behavior when interacting with the file system.

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Mitigation Strategies

To mitigate this vulnerability, update the Linux kernel to a version where the fix has been applied. The fix involves holding the sb_lock around the entire extension list read and format operation in f2fs_sbi_show(), preventing out-of-bounds access or stale data display.

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