Bug 2468102 (CVE-2026-43339) - CVE-2026-43339 kernel: ipv6: prevent possible UaF in addrconf_permanent_addr()
Summary: CVE-2026-43339 kernel: ipv6: prevent possible UaF in addrconf_permanent_addr()
Keywords:
Status: NEW
Alias: CVE-2026-43339
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-05-08 14:04 UTC by OSIDB Bzimport
Modified: 2026-09-17 07:20 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-2026:64775 0 None None None 2026-09-08 07:19:42 UTC
Red Hat Product Errata RHSA-2026:66180 0 None None None 2026-09-09 22:05:05 UTC
Red Hat Product Errata RHSA-2026:68531 0 None None None 2026-09-17 07:20:43 UTC
Red Hat Product Errata RHSA-2026:68532 0 None None None 2026-09-17 06:56:47 UTC

Description OSIDB Bzimport 2026-05-08 14:04:36 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ipv6: prevent possible UaF in addrconf_permanent_addr()

The mentioned helper try to warn the user about an exceptional
condition, but the message is delivered too late, accessing the ipv6
after its possible deletion.

Reorder the statement to avoid the possible UaF; while at it, place the
warning outside the idev->lock as it needs no protection.
Comment 1 Alexander B 2026-05-15 11:05:57 UTC 
Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-43339.mbox
Comment 6 errata-xmlrpc 2026-09-08 07:19:42 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
Comment 7 errata-xmlrpc 2026-09-09 22:05:04 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:66180 https://access.redhat.com/errata/RHSA-2026:66180
Comment 8 Jon Orris 2026-09-17 06:56:46 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:68532 https://access.redhat.com/errata/RHSA-2026:68532
Comment 9 Jon Orris 2026-09-17 07:20:42 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:68531 https://access.redhat.com/errata/RHSA-2026:68531
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