Bug 2348575 (CVE-2025-21764)

Summary:	CVE-2025-21764 kernel: ndisc: use RCU protection in ndisc_alloc_skb()
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	CC:	dfreiber, drow, jburrell, vkumar
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	A vulnerability was found in the Linux kernel's IPv6 Neighbor Discovery (NDISC) subsystem, which manages network neighbor information. The issue arises from improper synchronization mechanisms when allocating socket buffers (sk_buff) in the ndisc_alloc_skb() function. Specifically, the function can be called without holding the necessary Read-Copy-Update (RCU) or Routing Netlink (RTNL) locks, leading to a potential use-after-free (UAF) condition. This flaw allows an attacker with local access and low privileges to exploit the race condition, potentially causing system instability or crashes.	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 2025-02-27 03:03:47 UTC

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

ndisc: use RCU protection in ndisc_alloc_skb()

ndisc_alloc_skb() can be called without RTNL or RCU being held.

Add RCU protection to avoid possible UAF.

Comment 1 Michal Findra 2025-02-27 17:38:38 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022605-CVE-2025-21764-1061@gregkh/T

Comment 2 errata-xmlrpc 2025-06-02 01:16:08 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2025:8333 https://access.redhat.com/errata/RHSA-2025:8333

Comment 4 errata-xmlrpc 2025-06-16 07:44:06 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2025:9079 https://access.redhat.com/errata/RHSA-2025:9079

Comment 6 errata-xmlrpc 2025-06-24 04:38:08 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

Via RHSA-2025:9493 https://access.redhat.com/errata/RHSA-2025:9493

Comment 7 errata-xmlrpc 2025-06-24 04:43:59 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2025:9492 https://access.redhat.com/errata/RHSA-2025:9492

Comment 8 errata-xmlrpc 2025-06-24 05:05:42 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support

Via RHSA-2025:9497 https://access.redhat.com/errata/RHSA-2025:9497

Comment 9 errata-xmlrpc 2025-06-24 05:16:47 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Advanced Update Support

Via RHSA-2025:9490 https://access.redhat.com/errata/RHSA-2025:9490

Comment 10 errata-xmlrpc 2025-06-24 06:12:08 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2025:9491 https://access.redhat.com/errata/RHSA-2025:9491

Comment 11 errata-xmlrpc 2025-06-24 06:15:00 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

Via RHSA-2025:9494 https://access.redhat.com/errata/RHSA-2025:9494

Comment 12 errata-xmlrpc 2025-06-24 06:49:20 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 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.6 Telecommunications Update Service

Via RHSA-2025:9498 https://access.redhat.com/errata/RHSA-2025:9498

Comment 13 errata-xmlrpc 2025-06-25 00:14:06 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2025:9581 https://access.redhat.com/errata/RHSA-2025:9581

Comment 14 errata-xmlrpc 2025-06-25 00:31:10 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2025:9580 https://access.redhat.com/errata/RHSA-2025:9580

Comment 15 errata-xmlrpc 2025-06-25 00:34:50 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2025:9584 https://access.redhat.com/errata/RHSA-2025:9584

Comment 17 errata-xmlrpc 2025-07-02 13:26:00 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-2025:10211 https://access.redhat.com/errata/RHSA-2025:10211