Linux Kernel Vulnerability in Btrfs Filesystem Handling by Vendor

CVE-2023-53429

What is CVE-2023-53429?

A vulnerability in the Linux kernel's Btrfs subsystem was identified, where improper handling of PageError during I/O operations could lead to ambiguous error management. Specifically, the __extent_writepage function incorrectly set PageError upon encountering any error while also relying on it to dictate error handling actions. This scenario created uncertainties in error cleanup processes, with the risk that the PageError bit could inadvertently propagate into the context of I/O submissions, compromising data integrity and system stability. The issue has been addressed by removing the check for PageError, solely relying on local return variables for submission error checks, effectively preventing error bit leakage.

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