CVE-2026-93288

Summary

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

netfilter: nfnetlink_log: wait for rcu grace period before freeing pernet state

sashiko reports: "nfnl_log_net_exit() calls nf_log_unset(), which clears the logger pointer without an RCU grace period. Immediately after, ops_free_list() frees the per-net state while concurrent packets might still be executing nf_log_packet() under rcu_read_lock()."

Clear the pointer via .pre_exit to make sure rcu readers have completed before pernet storage is free'd. The change in nf_log_syslog.c is only done for consistency: it doesn't use pernet data.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxc83fa19603bdaeef17b815713dbbe3230c8a34ee < ba2e246aa294f9acd86194ea87fb6834ed0a37acaffected
LinuxLinuxc83fa19603bdaeef17b815713dbbe3230c8a34ee < 5570d6c8b320dbcc602617ee08c27ce752fed65aaffected
LinuxLinuxc83fa19603bdaeef17b815713dbbe3230c8a34ee < 3b9aa62d78ce80de47af2db472ff452398755213affected
LinuxLinuxc83fa19603bdaeef17b815713dbbe3230c8a34ee < f4461654374576e9d5d0245fd534c46ad8509051affected
LinuxLinuxc83fa19603bdaeef17b815713dbbe3230c8a34ee < dc20050b6b12ca58066715d088e1a537535d938daffected
LinuxLinuxc83fa19603bdaeef17b815713dbbe3230c8a34ee < 33d1469b0124cc0baaea7a2032123b77a81e0940affected
LinuxLinux4.12affected
LinuxLinux0 < 4.12unaffected
LinuxLinux5.15.222 <= 5.15.*unaffected
LinuxLinux6.1.189 <= 6.1.*unaffected
LinuxLinux6.6.158 <= 6.6.*unaffected
LinuxLinux6.12.111 <= 6.12.*unaffected
LinuxLinux6.18.53 <= 6.18.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References