Bug 2502327 (CVE-2026-63922) - CVE-2026-63922 kernel: ipv6: exthdrs: refresh nh after handling HAO option
Summary: CVE-2026-63922 kernel: ipv6: exthdrs: refresh nh after handling HAO option
Keywords:
Status: NEW
Alias: CVE-2026-63922
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-19 16:02 UTC by OSIDB Bzimport
Modified: 2026-10-08 07:23 UTC (History)
3 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-2026:76738 0 None None None 2026-10-07 20:29:19 UTC
Red Hat Product Errata RHSA-2026:77218 0 None None None 2026-10-07 06:27:35 UTC
Red Hat Product Errata RHSA-2026:77219 0 None None None 2026-10-08 07:23:16 UTC

Description OSIDB Bzimport 2026-07-19 16:02:08 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ipv6: exthdrs: refresh nh after handling HAO option

ip6_parse_tlv() caches skb_network_header(skb) in nh while walking
IPv6 TLVs.

ipv6_dest_hao() may call pskb_expand_head() for a cloned skb, which can
move the skb head and invalidate the cached network header pointer.
Refresh nh after ipv6_dest_hao() returns so any trailing padding or TLVs
are parsed from the current skb head.

This matches the existing pattern used in ip6_parse_tlv() after helpers
that can modify skb header storage.
Comment 1 Keith Grant 2026-07-21 21:23:02 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026071948-CVE-2026-63922-5716@gregkh/T
Comment 3 Jon Orris 2026-10-07 06:27:34 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Via RHSA-2026:77218 https://access.redhat.com/errata/RHSA-2026:77218
Comment 4 Jon Orris 2026-10-07 20:29:19 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:76738 https://access.redhat.com/errata/RHSA-2026:76738
Comment 5 Jon Orris 2026-10-08 07:23:16 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:77219 https://access.redhat.com/errata/RHSA-2026:77219
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