Bug 2432664 (CVE-2026-23001)

Summary:	CVE-2026-23001 kernel: macvlan: fix possible UAF in macvlan_forward_source()
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	Keywords:	Security
Target Milestone:	---
Target Release:	---
Hardware:	All
OS:	Linux
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
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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