Block Device Vulnerability in Linux Kernel

CVE-2025-21832

Summary

A vulnerability in the Linux kernel's block device handling has been identified, specifically within the blkdev_read_iter() function. This issue arises from improper checks related to the return values of blkdev_direct_IO(), which may lead to incorrect handling of negative return values during an iov_iter_revert operation. Consequently, this mismanagement could generate warnings due to excess unroll attempts. To mitigate such occurrences, the system should abstain from reverting operations for -EIOCBQUEUED to ensure proper functionality and stability.

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