CVE-2026-90266

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description In zoned file systems, the btrfs delayed refs rsv refill() function returns -EAGAIN when the sum of over-committed metadata and zone unusable bytes exceeds the usable size in a metadata block-group. This mechanism is intended to prevent excessive metadata over-commitment and premature ENOSPC (Error No Space) within a single transaction. However, if this occurs during a reclaim process, the transaction is aborted, which can force the file system into read-only mode.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.