CVE-2026-89787

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

Description An out-of-bounds read exists in the ext4 file system when handling casefolded encrypted directories. The ext4 search dir() function performs a pre-check that only verifies if the directory entry name fits within the block boundary, failing to account for the 8-byte hash trailer stored after the name. A crafted entry ending exactly at the block boundary can cause the ext4 match() function to read past the block end. This can lead to a use-after-free condition if the subsequent memory page contains a freed object.

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