CVE-2026-74605

Technical Description

In the Linux kernel, the following vulnerability has been resolved:

eventfs: Use children field for rcu head and add memory barriers

When an eventfs inode is freed, it sets ei->is_freed and then uses its

ei->list to add it to the srcu link list as the list field is a union with

the rcu list head. As the ei->list is used to iterate over an SRCU

protected list without taking the eventfs_mutex, there's nothing stopping

the iteration over that list to see the ei->rcu instead of the ei->list

and it will read a corrupt target.

To fix this, change the union of the rcu list head with the children list.

On freeing the eventfs inode, set the is_free and execute a smp_wmb()

before adding the eventfs inode to the SRCU list.

On iteration of the ei->children list, at the start, execute a smp_rmb()

and then read the is_freed of the ei to see if the children list is still

valid. If is_freed is set, then the ei_child read is not valid and the

loop should exit immediately.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References