Bug 2467228 (CVE-2026-43198) - CVE-2026-43198 kernel: tcp: fix potential race in tcp_v6_syn_recv_sock()
Summary: CVE-2026-43198 kernel: tcp: fix potential race in tcp_v6_syn_recv_sock()
Keywords:
Status: NEW
Alias: CVE-2026-43198
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-05-06 13:11 UTC by OSIDB Bzimport
Modified: 2026-07-07 19:40 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-2026:30129 0 None None None 2026-06-25 22:13:24 UTC
Red Hat Product Errata RHSA-2026:33215 0 None None None 2026-06-29 19:23:56 UTC
Red Hat Product Errata RHSA-2026:33285 0 None None None 2026-06-29 22:54:08 UTC
Red Hat Product Errata RHSA-2026:34094 0 None None None 2026-07-01 08:59:05 UTC
Red Hat Product Errata RHSA-2026:34443 0 None None None 2026-07-01 19:15:16 UTC
Red Hat Product Errata RHSA-2026:35863 0 None None None 2026-07-06 04:51:30 UTC
Red Hat Product Errata RHSA-2026:35894 0 None None None 2026-07-06 13:42:09 UTC
Red Hat Product Errata RHSA-2026:35896 0 None None None 2026-07-06 14:26:45 UTC
Red Hat Product Errata RHSA-2026:35904 0 None None None 2026-07-06 14:26:11 UTC
Red Hat Product Errata RHSA-2026:36073 0 None None None 2026-07-07 05:33:58 UTC
Red Hat Product Errata RHSA-2026:36216 0 None None None 2026-07-07 14:06:01 UTC
Red Hat Product Errata RHSA-2026:36348 0 None None None 2026-07-07 19:25:45 UTC
Red Hat Product Errata RHSA-2026:36349 0 None None None 2026-07-07 19:40:34 UTC

Description OSIDB Bzimport 2026-05-06 13:11:57 UTC 
In the Linux kernel, the following vulnerability has been resolved:

tcp: fix potential race in tcp_v6_syn_recv_sock()

Code in tcp_v6_syn_recv_sock() after the call to tcp_v4_syn_recv_sock()
is done too late.

After tcp_v4_syn_recv_sock(), the child socket is already visible
from TCP ehash table and other cpus might use it.

Since newinet->pinet6 is still pointing to the listener ipv6_pinfo
bad things can happen as syzbot found.

Move the problematic code in tcp_v6_mapped_child_init()
and call this new helper from tcp_v4_syn_recv_sock() before
the ehash insertion.

This allows the removal of one tcp_sync_mss(), since
tcp_v4_syn_recv_sock() will call it with the correct
context.
Comment 1 Keith Grant 2026-05-06 21:01:18 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026050645-CVE-2026-43198-0870@gregkh/T
Comment 3 errata-xmlrpc 2026-06-25 22:13:24 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:30129 https://access.redhat.com/errata/RHSA-2026:30129
Comment 4 errata-xmlrpc 2026-06-29 19:23:55 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:33215 https://access.redhat.com/errata/RHSA-2026:33215
Comment 5 errata-xmlrpc 2026-06-29 22:54:07 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:33285 https://access.redhat.com/errata/RHSA-2026:33285
Comment 6 errata-xmlrpc 2026-07-01 08:59:04 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:34094 https://access.redhat.com/errata/RHSA-2026:34094
Comment 8 errata-xmlrpc 2026-07-01 19:15:14 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Via RHSA-2026:34443 https://access.redhat.com/errata/RHSA-2026:34443
Comment 9 errata-xmlrpc 2026-07-06 04:51:29 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-2026:35863 https://access.redhat.com/errata/RHSA-2026:35863
Comment 10 errata-xmlrpc 2026-07-06 13:42:08 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-2026:35894 https://access.redhat.com/errata/RHSA-2026:35894
Comment 11 errata-xmlrpc 2026-07-06 14:26:10 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:35904 https://access.redhat.com/errata/RHSA-2026:35904
Comment 12 errata-xmlrpc 2026-07-06 14:26:44 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-2026:35896 https://access.redhat.com/errata/RHSA-2026:35896
Comment 13 errata-xmlrpc 2026-07-07 05:33:58 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:36073 https://access.redhat.com/errata/RHSA-2026:36073
Comment 14 errata-xmlrpc 2026-07-07 14:05:59 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2026:36216 https://access.redhat.com/errata/RHSA-2026:36216
Comment 15 errata-xmlrpc 2026-07-07 19:25:44 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:36348 https://access.redhat.com/errata/RHSA-2026:36348
Comment 16 errata-xmlrpc 2026-07-07 19:40:33 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:36349 https://access.redhat.com/errata/RHSA-2026:36349
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