CVE-2026-74512

Summary

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

audit: fix potential use-after-free in audit_del_rule()

audit_del_rule() destroys e->rule.exe via audit_remove_mark_rule() before unlinking the rule from RCU-visible filter lists and waiting for a grace period. Concurrent readers in audit_filter() and audit_filter_rules() still dereference e->rule.exe, while the fsnotify mark can be freed on an independent lifetime path. This creates a use-after-free window during rule deletion.

Fix this by unlinking the rule from the RCU-visible lists and invoking synchronize_rcu() before calling audit_remove_mark_rule() (and other rule removal helpers). This ensures that all existing RCU readers have exited the critical section before any underlying resources are destroyed.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux34d99af52ad40bd498ba66970579a5bc1fb1a3bc < 45bf3df5b32e5a49953e7ceabc55f7dd85380e46affected
LinuxLinux34d99af52ad40bd498ba66970579a5bc1fb1a3bc < 78bde7e9bd36eaae1b8e8cfcd47f12a34f301dbfaffected
LinuxLinux34d99af52ad40bd498ba66970579a5bc1fb1a3bc < cae0dfed5d307b240bff71c3cf206652d1b6f215affected
LinuxLinux34d99af52ad40bd498ba66970579a5bc1fb1a3bc < 5b8f46864f06d6dbacb7dcea52bc084dfd122638affected
LinuxLinux34d99af52ad40bd498ba66970579a5bc1fb1a3bc < 246df90b5f1a8a6e6abbd2f058b029558720adecaffected
LinuxLinux4.3affected
LinuxLinux0 < 4.3unaffected
LinuxLinux6.6.151 <= 6.6.*unaffected
LinuxLinux6.12.103 <= 6.12.*unaffected
LinuxLinux6.18.44 <= 6.18.*unaffected
LinuxLinux7.1.8 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References