CVE-2024-56758

Summary

CVE-2024-56758 is a vulnerability in the Linux kernel's btrfs file system. It arises when a thread modifies the folio mapping after it has been unlocked during the process of bringing a folio up to date. This can result in an invalid page and a crash, as demonstrated by the provided kernel crash log. The issue occurs due to a race condition between the call to btrfs_read_folio() and the call to folio_lock() in the function relocate_one_folio(). This vulnerability was resolved, but it's important to note that the reported crash isn't directly linked to the initial patch that introduced the race condition, but rather to a more recent change that made it manifest in practice.

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