Bug 2502363 (CVE-2026-64002)

Summary:	CVE-2026-64002 kernel: ipv4: free net->ipv4.sysctl_local_reserved_ports after unregister_net_sysctl_table()
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	rhel-process-autobot, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in the Linux kernel's IPv4 networking component. The `ipv4_sysctl_exit_net()` function prematurely frees the `net->ipv4.sysctl_local_reserved_ports` memory. This can lead to a use-after-free vulnerability, where other threads might attempt to access deallocated memory. Such an issue can result in system instability or a denial of service.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-07-19 16:04:04 UTC

In the Linux kernel, the following vulnerability has been resolved:

ipv4: free net->ipv4.sysctl_local_reserved_ports after unregister_net_sysctl_table()

ipv4_sysctl_exit_net() is currently freeing net->ipv4.sysctl_local_reserved_ports
too soon.

Only after unregister_net_sysctl_table() we can be sure no threads can possibly
use the sysctls, including /proc/sys/net/ipv4/ip_local_reserved_ports.

Comment 1 Keith Grant 2026-07-22 00:00:05 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026071907-CVE-2026-64002-b8fe@gregkh/T

Comment 3 errata-xmlrpc 2026-08-31 06:38:30 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-2026:61310 https://access.redhat.com/errata/RHSA-2026:61310

Comment 4 errata-xmlrpc 2026-09-01 09:29:03 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-2026:61932 https://access.redhat.com/errata/RHSA-2026:61932

Comment 5 errata-xmlrpc 2026-09-01 11:09:28 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-2026:61959 https://access.redhat.com/errata/RHSA-2026:61959

Comment 6 errata-xmlrpc 2026-09-02 01:12:44 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Via RHSA-2026:62346 https://access.redhat.com/errata/RHSA-2026:62346

Comment 7 errata-xmlrpc 2026-09-02 08:14:15 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:62522 https://access.redhat.com/errata/RHSA-2026:62522

Comment 8 errata-xmlrpc 2026-09-02 08:31:39 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:62508 https://access.redhat.com/errata/RHSA-2026:62508

Comment 9 errata-xmlrpc 2026-09-02 11:02:45 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:62568 https://access.redhat.com/errata/RHSA-2026:62568

Comment 10 errata-xmlrpc 2026-09-02 12:29:37 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:62609 https://access.redhat.com/errata/RHSA-2026:62609

Comment 11 errata-xmlrpc 2026-09-04 00:53:00 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:63129 https://access.redhat.com/errata/RHSA-2026:63129

Comment 13 errata-xmlrpc 2026-09-08 07:19:53 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:64775 https://access.redhat.com/errata/RHSA-2026:64775