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Advisory severityHigh7.0Red Hat Linux

High [CVE-2026-63922] refresh nh after handling HAO option

This high-severity Red Hat Linux advisory covers CVE-2026-63922 affecting Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION, Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support.

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CVE-2026-63922 Source published Source updated

VulniPulse record published Record updated

CVE-2026-63922
Affected products & platforms
Red Hat LinuxLinux Kernel
Open source advisory

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Summary

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.

When processing the Home Address Option (HAO), the cached network header pointer may become invalid if the packet's memory is reallocated. This can lead to incorrect parsing of subsequent IPv6 Type-Length-Value (TLV) options, potentially causing unexpected network behavior or a denial of service.

Red Hat severity: Important — CVSS 7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H). Weakness: CWE-825.

Affected products named by the advisory: Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On; and 9 more.

Affected versions

No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.

Official advisory · high-confidence parse· fetched 7 days ago·verify at source

Fixed versions
  • kernel-0:6.12.0-211.63.1.el10_2
  • kernel-0:6.12.0-55.111.1.el10_0
  • kernel-0:2.6.32-754.65.1.el6
  • kernel-0:4.18.0-305.214.1.el8_4
  • kernel-0:4.18.0-372.223.1.el8_6
  • kernel-0:4.18.0-477.175.1.el8_8
  • kernel-0:5.14.0-687.55.1.el9_8
  • kernel-0:5.14.0-427.154.1.el9_4
  • kernel-0:5.14.0-570.147.1.el9_6
  • RHSA-2026:76738
  • RHSA-2026:83707
  • RHSA-2026:83796
  • RHSA-2026:84677
  • RHSA-2026:85000
  • RHSA-2026:84793
  • RHSA-2026:76739
  • RHSA-2026:77218
  • RHSA-2026:77219

Official advisory · high-confidence parse· fetched 7 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

Official advisory · high-confidence parse· fetched 7 days ago·verify at source

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