Deadlock Vulnerability in the Linux Kernel Affecting I/O Operations

CVE-2026-80720

What is CVE-2026-80720?

A vulnerability within the Linux kernel related to I/O operations has been identified, where the iomap_split_ioend function can lead to a deadlock situation. This occurs when dealing with bios that originate from the iomap_ioend_bioset, particularly if the bioset becomes exhausted. To mitigate this issue, a separate bio_set has been introduced, preventing potential deadlocks and enhancing overall system stability. This fix also addresses sparse warnings previously noted by the kernel test robot, ensuring cleaner code within the ioend management.

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