CVE-2026-93288

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

HIGH

7.8

CVSS Score

Published: September 24, 2026 at 04:02 PM UTC

Updated: October 3, 2026 at 11:17 AM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

HIGH7.8

Exploit prediction

EPSS 0.1%

Description

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

4.12 ≤ v < 5.15.2224.12 ≤ v < 6.1.1894.12 ≤ v < 6.12.1114.12 ≤ v < 6.18.534.12 ≤ v < 6.6.1584.12 ≤ v < 7.24.12c83fa19603bdaeef17b815713dbbe3230c8a34ee

Vendor states this is fixed in 33d1469b0124cc0baaea7a2032123b77a81e0940 (fixed)

Vendor states this is fixed in 3b9aa62d78ce80de47af2db472ff452398755213 (fixed)

Vendor states this is fixed in 5570d6c8b320dbcc602617ee08c27ce752fed65a (fixed)

Vendor states this is fixed in ba2e246aa294f9acd86194ea87fb6834ed0a37ac (fixed)

Vendor states this is fixed in dc20050b6b12ca58066715d088e1a537535d938d (fixed)

Vendor states this is fixed in f4461654374576e9d5d0245fd534c46ad8509051 (fixed)

Vendor states this is fixed in 4.12 (unaffected)

Vendor states this is fixed in 5.15.222 (unaffected)

Vendor states this is fixed in 6.1.189 (unaffected)

Vendor states this is fixed in 6.12.111 (unaffected)

Vendor states this is fixed in 6.18.53 (unaffected)

Vendor states this is fixed in 6.6.158 (unaffected)