---
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 >= c83fa19603bdaeef17b815713dbbe3230c8a34ee <
    ba2e246aa294f9acd86194ea87fb6834ed0a37ac
  - >-
    Linux >= c83fa19603bdaeef17b815713dbbe3230c8a34ee <
    5570d6c8b320dbcc602617ee08c27ce752fed65a
  - >-
    Linux >= c83fa19603bdaeef17b815713dbbe3230c8a34ee <
    3b9aa62d78ce80de47af2db472ff452398755213
  - >-
    Linux >= c83fa19603bdaeef17b815713dbbe3230c8a34ee <
    f4461654374576e9d5d0245fd534c46ad8509051
  - >-
    Linux >= c83fa19603bdaeef17b815713dbbe3230c8a34ee <
    dc20050b6b12ca58066715d088e1a537535d938d
  - >-
    Linux >= c83fa19603bdaeef17b815713dbbe3230c8a34ee <
    33d1469b0124cc0baaea7a2032123b77a81e0940
  - Linux 4.12
published: '2026-09-24'
updated: '2026-10-03'
sourceUpdated: '2026-10-03T11:17:47.413'
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/3b9aa62d78ce80de47af2db472ff452398755213'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5570d6c8b320dbcc602617ee08c27ce752fed65a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ba2e246aa294f9acd86194ea87fb6834ed0a37ac'
    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
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93288.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-93288'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2540500'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-93288'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93288'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-93288.mbox
  - url: 'https://access.redhat.com/errata/RHSA-2026:76739'
  - url: 'https://access.redhat.com/errata/RHSA-2026:85773'
  - url: 'https://access.redhat.com/errata/RHSA-2026:85774'
  - url: 'https://access.redhat.com/errata/RHSA-2026:76738'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00129
epssPercentile: 0.02534
ingestedAt: '2026-09-24T16:47:15.905Z'
cwe:
  - CWE-825
patched:
  - enterprise_linux_appstream_v_9
  - enterprise_linux_baseos_v_8
  - enterprise_linux_baseos_v_9
  - enterprise_linux_crb_v_8
  - enterprise_linux_codeready_linux_builder_v_9
  - enterprise_linux_nfv_v_8
  - enterprise_linux_real_time_for_nfv_v_9
  - enterprise_linux_rt_v_8
  - enterprise_linux_real_time_v_9
---

## 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.

## Vendor advisories

- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4, Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-26 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93288.json)
- **RHSA-2026:76739** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9), Red Hat Enterprise Linux Real Time for NFV (v. 9), Red Hat Enterprise Linux Real Time (v. 9) · released 2026-10-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:76739)
- **RHSA-2026:85773** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS (v. 8), Red Hat Enterprise Linux CRB (v. 8) · released 2026-10-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:85773)
- **RHSA-2026:85774** · Red Hat · fixed in: Red Hat Enterprise Linux NFV (v. 8), Red Hat Enterprise Linux RT (v. 8) · released 2026-10-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:85774)
- **RHSA-2026:76738** · Red Hat · fixed in: 10Base-SMTV, Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10), Red Hat Enterprise Linux Hidden (v. 10), Red Hat Enterprise Linux Real Time for NFV (v. 10), … · released 2026-10-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:76738)