Bug 2524483 (CVE-2026-74746) - CVE-2026-74746 kernel: netfilter: flowtable: publish GC-visible tuple last
Summary: CVE-2026-74746 kernel: netfilter: flowtable: publish GC-visible tuple last
Keywords:
Status: NEW
Alias: CVE-2026-74746
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-26 14:59 UTC by OSIDB Bzimport
Modified: 2026-10-08 09:50 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-2026:73645 0 None None None 2026-09-30 00:46:19 UTC
Red Hat Product Errata RHSA-2026:74174 0 None None None 2026-10-01 09:02:10 UTC
Red Hat Product Errata RHSA-2026:75560 0 None None None 2026-10-05 00:36:20 UTC
Red Hat Product Errata RHSA-2026:75746 0 None None None 2026-10-05 10:48:54 UTC
Red Hat Product Errata RHSA-2026:75747 0 None None None 2026-10-05 11:24:00 UTC
Red Hat Product Errata RHSA-2026:76738 0 None None None 2026-10-07 20:28:57 UTC
Red Hat Product Errata RHSA-2026:76739 0 None None None 2026-10-08 09:50:26 UTC
Red Hat Product Errata RHSA-2026:77214 0 None None None 2026-10-07 02:32:11 UTC
Red Hat Product Errata RHSA-2026:77215 0 None None None 2026-10-07 05:32:15 UTC
Red Hat Product Errata RHSA-2026:77216 0 None None None 2026-10-07 02:49:28 UTC
Red Hat Product Errata RHSA-2026:77217 0 None None None 2026-10-07 03:39:14 UTC
Red Hat Product Errata RHSA-2026:77301 0 None None None 2026-10-07 07:04:47 UTC

Description OSIDB Bzimport 2026-08-26 14:59:34 UTC 
In the Linux kernel, the following vulnerability has been resolved:

netfilter: flowtable: publish GC-visible tuple last

nf_flow_table_iterate() only treats original-direction tuple nodes as
owning entries. Publishing the original node first lets GC observe and
free a flow while flow_offload_add() is still inserting the reply node.
Publish the reply node first and the original node last so GC never
sees a partially installed flow.

KASAN can trigger slab-use-after-free read and write reports in the
flowtable/rhashtable path (rht_deferred_worker, jhash, flow_offload_del,
flow_offload_lookup, etc.).
Comment 1 gkamathe 2026-08-27 11:41:45 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026082658-CVE-2026-74746-c2f9@gregkh/T
Comment 3 Jon Orris 2026-09-30 00:46:18 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Via RHSA-2026:73645 https://access.redhat.com/errata/RHSA-2026:73645
Comment 4 Jon Orris 2026-10-01 09:02:09 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:74174 https://access.redhat.com/errata/RHSA-2026:74174
Comment 5 Jon Orris 2026-10-05 00:36:19 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:75560 https://access.redhat.com/errata/RHSA-2026:75560
Comment 6 Jon Orris 2026-10-05 10:48:53 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:75746 https://access.redhat.com/errata/RHSA-2026:75746
Comment 7 Jon Orris 2026-10-05 11:23:59 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:75747 https://access.redhat.com/errata/RHSA-2026:75747
Comment 8 Jon Orris 2026-10-07 02:32:10 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:77214 https://access.redhat.com/errata/RHSA-2026:77214
Comment 9 Jon Orris 2026-10-07 02:49:28 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-2026:77216 https://access.redhat.com/errata/RHSA-2026:77216
Comment 10 Jon Orris 2026-10-07 03:39:13 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-2026:77217 https://access.redhat.com/errata/RHSA-2026:77217
Comment 11 Jon Orris 2026-10-07 05:32:14 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:77215 https://access.redhat.com/errata/RHSA-2026:77215
Comment 12 Jon Orris 2026-10-07 07:04:46 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-2026:77301 https://access.redhat.com/errata/RHSA-2026:77301
Comment 13 Jon Orris 2026-10-07 20:28:56 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:76738 https://access.redhat.com/errata/RHSA-2026:76738
Comment 14 Jon Orris 2026-10-08 09:50:25 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:76739 https://access.redhat.com/errata/RHSA-2026:76739
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