CVE-2026-74605

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

References

• https://git.kernel.org/stable/c/25d27d5fa8645ab61018c3efec5c69f49280ca7d ↗
• https://git.kernel.org/stable/c/1b95382da85cff3bf0f922ff0275f186abdadfce ↗
• https://git.kernel.org/stable/c/2b80707b9e27671e10840d17c6f8f774c4ad9847 ↗
• https://git.kernel.org/stable/c/004f7232e49730448f91665e76bdd7dff8e0c638 ↗
• https://git.kernel.org/stable/c/f0ece16ffca7384787b692431961ce202907acf5 ↗