CVE-2026-74484

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

Description A denial of service (DoS) issue exists in the binfmt misc module. An entry registered with the 'F' flag opens its interpreter at registration and retains the file until the entry is freed. If the interpreter is located on a mount that keeps the binfmt misc superblock active, a circular reference is created where the superblock and the file pin each other, preventing the file from ever being closed. This can be triggered by pointing the interpreter at the instance itself or by using the instance as an overlayfs lower layer. This condition leads to a superblock leak and pins the user namespace, consuming user namespace charges with each iteration.

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