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CVE-2026-74605

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

Description (CNA)

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 (CNA)

Vendor / productVersions
Linux / Linuxaffected f3f41f444b321ec393edbc251e024fd62658ce55 before 25d27d5fa8645ab61018c3efec5c69f49280ca7d; affected 704f960dbee2f1634f4b4e16f208cb16eaf41c1e before 1b95382da85cff3bf0f922ff0275f186abdadfce; affected 704f960dbee2f1634f4b4e16f208cb16eaf41c1e before 2b80707b9e27671e10840d17c6f8f774c4ad9847; affected 704f960dbee2f1634f4b4e16f208cb16eaf41c1e before 004f7232e49730448f91665e76bdd7dff8e0c638; affected 704f960dbee2f1634f4b4e16f208cb16eaf41c1e before f0ece16ffca7384787b692431961ce202907acf5; affected 305c4e4d80aca2c2d9cf2ebdea56e2eca6d3a6aa; affected 6.6.18 before 6.6.160; affected 6.7.6 before 6.8
Linux / Linuxaffected 6.8; unaffected 0 before 6.8; unaffected 6.6.160 through 6.6.*; unaffected 6.12.114 through 6.12.*; unaffected 6.18.57 through 6.18.*; unaffected 7.1.9 through 7.1.*; unaffected 7.2 through *

CWE

No CWE identifiers supplied.

References