Bug 2451218 (CVE-2026-23392) - CVE-2026-23392 kernel: netfilter: nf_tables: release flowtable after rcu grace period on error
Summary: CVE-2026-23392 kernel: netfilter: nf_tables: release flowtable after rcu grac...
Keywords:
Status: NEW
Alias: CVE-2026-23392
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-03-25 11:05 UTC by OSIDB Bzimport
Modified: 2026-06-17 13:19 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:21556 0 None None None 2026-05-28 01:23:58 UTC
Red Hat Product Errata RHSA-2026:21557 0 None None None 2026-05-28 01:19:54 UTC
Red Hat Product Errata RHSA-2026:23224 0 None None None 2026-06-04 12:16:41 UTC
Red Hat Product Errata RHSA-2026:23237 0 None None None 2026-06-04 10:22:41 UTC
Red Hat Product Errata RHSA-2026:24343 0 None None None 2026-06-08 03:03:26 UTC
Red Hat Product Errata RHSA-2026:25120 0 None None None 2026-06-10 20:00:16 UTC
Red Hat Product Errata RHSA-2026:25121 0 None None None 2026-06-10 21:39:02 UTC
Red Hat Product Errata RHSA-2026:26462 0 None None None 2026-06-17 01:13:56 UTC
Red Hat Product Errata RHSA-2026:26515 0 None None None 2026-06-17 06:33:33 UTC
Red Hat Product Errata RHSA-2026:26535 0 None None None 2026-06-17 09:18:42 UTC
Red Hat Product Errata RHSA-2026:26563 0 None None None 2026-06-17 11:58:29 UTC
Red Hat Product Errata RHSA-2026:26570 0 None None None 2026-06-17 13:19:44 UTC

Description OSIDB Bzimport 2026-03-25 11:05:17 UTC 
In the Linux kernel, the following vulnerability has been resolved:

netfilter: nf_tables: release flowtable after rcu grace period on error

Call synchronize_rcu() after unregistering the hooks from error path,
since a hook that already refers to this flowtable can be already
registered, exposing this flowtable to packet path and nfnetlink_hook
control plane.

This error path is rare, it should only happen by reaching the maximum
number hooks or by failing to set up to hardware offload, just call
synchronize_rcu().

There is a check for already used device hooks by different flowtable
that could result in EEXIST at this late stage. The hook parser can be
updated to perform this check earlier to this error path really becomes
rarely exercised.

Uncovered by KASAN reported as use-after-free from nfnetlink_hook path
when dumping hooks.
Comment 1 Alexander B 2026-03-25 15:16:14 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026032548-CVE-2026-23392-fd9d@gregkh/T
Comment 3 errata-xmlrpc 2026-05-28 01:19:53 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:21557 https://access.redhat.com/errata/RHSA-2026:21557
Comment 4 errata-xmlrpc 2026-05-28 01:23:58 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:21556 https://access.redhat.com/errata/RHSA-2026:21556
Comment 5 errata-xmlrpc 2026-06-04 10:22:40 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Via RHSA-2026:23237 https://access.redhat.com/errata/RHSA-2026:23237
Comment 6 errata-xmlrpc 2026-06-04 12:16:40 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:23224 https://access.redhat.com/errata/RHSA-2026:23224
Comment 7 errata-xmlrpc 2026-06-08 03:03:25 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:24343 https://access.redhat.com/errata/RHSA-2026:24343
Comment 10 errata-xmlrpc 2026-06-10 20:00:16 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:25120 https://access.redhat.com/errata/RHSA-2026:25120
Comment 11 errata-xmlrpc 2026-06-10 21:39:01 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:25121 https://access.redhat.com/errata/RHSA-2026:25121
Comment 12 errata-xmlrpc 2026-06-17 01:13:56 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:26462 https://access.redhat.com/errata/RHSA-2026:26462
Comment 13 errata-xmlrpc 2026-06-17 06:33:32 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:26515 https://access.redhat.com/errata/RHSA-2026:26515
Comment 14 errata-xmlrpc 2026-06-17 09:18:41 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

Via RHSA-2026:26535 https://access.redhat.com/errata/RHSA-2026:26535
Comment 15 errata-xmlrpc 2026-06-17 11:58:28 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Via RHSA-2026:26563 https://access.redhat.com/errata/RHSA-2026:26563
Comment 16 errata-xmlrpc 2026-06-17 13:19:44 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

Via RHSA-2026:26570 https://access.redhat.com/errata/RHSA-2026:26570
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