Undefined Behavior in Linux Kernel's ext4 Filesystem

CVE-2022-50403

What is CVE-2022-50403?

This vulnerability in the Linux Kernel's ext4 filesystem relates to an undefined behavior caused by shifting a signed 32-bit integer by 31 bits. This can trigger a UBSAN warning indicating a shift-out-of-bounds error. The fix modifies the behavior by changing the significant bit to unsigned, thus ensuring proper handling of bit shifts and preventing potential misuse of this vulnerability in data manipulation or resource allocation.

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