Bug 2432664 (CVE-2026-23001) - CVE-2026-23001 kernel: macvlan: fix possible UAF in macvlan_forward_source()
Summary: CVE-2026-23001 kernel: macvlan: fix possible UAF in macvlan_forward_source()
Keywords:
Status: NEW
Alias: CVE-2026-23001
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-01-25 15:01 UTC by OSIDB Bzimport
Modified: 2026-04-27 18:01 UTC (History)
0 users

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-2026:3963 0 None None None 2026-03-09 00:38:00 UTC
Red Hat Product Errata RHSA-2026:3964 0 None None None 2026-03-09 00:16:46 UTC
Red Hat Product Errata RHSA-2026:3966 0 None None None 2026-03-09 00:34:21 UTC
Red Hat Product Errata RHSA-2026:4012 0 None None None 2026-03-09 09:41:35 UTC
Red Hat Product Errata RHSA-2026:5197 0 None None None 2026-03-23 01:11:07 UTC
Red Hat Product Errata RHSA-2026:6310 0 None None None 2026-04-01 00:45:06 UTC
Red Hat Product Errata RHSA-2026:6948 0 None None None 2026-04-08 00:11:19 UTC
Red Hat Product Errata RHSA-2026:6954 0 None None None 2026-04-08 03:32:14 UTC
Red Hat Product Errata RHSA-2026:6986 0 None None None 2026-04-08 05:58:19 UTC
Red Hat Product Errata RHSA-2026:9835 0 None None None 2026-04-22 17:40:00 UTC
Red Hat Product Errata RHSA-2026:9836 0 None None None 2026-04-22 17:46:51 UTC

Description OSIDB Bzimport 2026-01-25 15:01:59 UTC 
In the Linux kernel, the following vulnerability has been resolved:

macvlan: fix possible UAF in macvlan_forward_source()

Add RCU protection on (struct macvlan_source_entry)->vlan.

Whenever macvlan_hash_del_source() is called, we must clear
entry->vlan pointer before RCU grace period starts.

This allows macvlan_forward_source() to skip over
entries queued for freeing.

Note that macvlan_dev are already RCU protected, as they
are embedded in a standard netdev (netdev_priv(ndev)).

https: //lore.kernel.org/netdev/695fb1e8.050a0220.1c677c.039f.GAE/T/#u
Comment 1 Alexander B 2026-01-26 09:19:37 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026012534-CVE-2026-23001-7ab0@gregkh/T
Comment 3 errata-xmlrpc 2026-03-09 00:16:45 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:3964 https://access.redhat.com/errata/RHSA-2026:3964
Comment 4 errata-xmlrpc 2026-03-09 00:34:20 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:3966 https://access.redhat.com/errata/RHSA-2026:3966
Comment 5 errata-xmlrpc 2026-03-09 00:37:59 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:3963 https://access.redhat.com/errata/RHSA-2026:3963
Comment 6 errata-xmlrpc 2026-03-09 09:41:34 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:4012 https://access.redhat.com/errata/RHSA-2026:4012
Comment 7 errata-xmlrpc 2026-03-23 01:11:06 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:5197 https://access.redhat.com/errata/RHSA-2026:5197
Comment 8 errata-xmlrpc 2026-04-01 00:45:05 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2026:6310 https://access.redhat.com/errata/RHSA-2026:6310
Comment 9 errata-xmlrpc 2026-04-08 00:11:18 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:6948 https://access.redhat.com/errata/RHSA-2026:6948
Comment 10 errata-xmlrpc 2026-04-08 03:32:13 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-2026:6954 https://access.redhat.com/errata/RHSA-2026:6954
Comment 11 errata-xmlrpc 2026-04-08 05:58:17 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:6986 https://access.redhat.com/errata/RHSA-2026:6986
Comment 12 errata-xmlrpc 2026-04-22 17:39:59 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

Via RHSA-2026:9835 https://access.redhat.com/errata/RHSA-2026:9835
Comment 13 errata-xmlrpc 2026-04-22 17:46:50 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

Via RHSA-2026:9836 https://access.redhat.com/errata/RHSA-2026:9836
Comment 16 errata-xmlrpc 2026-04-27 18:01:42 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:10996 https://access.redhat.com/errata/RHSA-2026:10996
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