---
id: CVE-2026-93288
title: >-
  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 poi…
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 poi…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    f4461654374576e9d5d0245fd534c46ad8509051
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    dc20050b6b12ca58066715d088e1a537535d938d
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    33d1469b0124cc0baaea7a2032123b77a81e0940
  - Linux < 6.12.111
  - Linux < 6.18.53
  - Linux (all versions)
published: '2026-09-24'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T05:17:02.163'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93288'
references:
  - url: 'https://git.kernel.org/stable/c/33d1469b0124cc0baaea7a2032123b77a81e0940'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/dc20050b6b12ca58066715d088e1a537535d938d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f4461654374576e9d5d0245fd534c46ad8509051'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-24T16:47:15.905Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.