CVE-2026-80734

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

Description An issue exists in the btrfs file system where cached inodes may not have their mapping flags and minimal folio order properly initialized. This occurs when an inode is evicted due to memory pressure and subsequently re-initialized via btrfs iget(). In such cases, the process may skip the calls to btrfs update inode mapping flags() and btrfs set inode mapping order(), leaving the minimal folio order at 0 instead of the required value for the block size. Consequently, a page cache read may retrieve a folio smaller than the block size, leading to a kernel crash.

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