ipv6: exthdrs: refresh nh after handling HAO option

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Summary

CVECVE-2026-63922
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:10 UTC
Updated2026-07-20 15:16:56 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.002050000 probability, percentile 0.107250000 (date 2026-07-20)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected a831f5bbc89a9978795504be9e1ff412043f8f77 f8aabed3ff3e986920cf02a2a2785e08e586b234 git Not specified
CNA Linux Linux affected a831f5bbc89a9978795504be9e1ff412043f8f77 1a11eb7431e3d2882f5bd5939c5a9bbc65ccf4d1 git Not specified
CNA Linux Linux affected a831f5bbc89a9978795504be9e1ff412043f8f77 12d957979e4a800167842f1b42be6a606d227ebe git Not specified
CNA Linux Linux affected a831f5bbc89a9978795504be9e1ff412043f8f77 ff375ed1cba81392346c5bfbf0bb7a13b2946f99 git Not specified
CNA Linux Linux affected a831f5bbc89a9978795504be9e1ff412043f8f77 751db1b802a067b7fff25880f4e9f9152a171538 git Not specified
CNA Linux Linux affected a831f5bbc89a9978795504be9e1ff412043f8f77 9b6dcc0a39fd71752937f0b6b3973e1416085dcf git Not specified
CNA Linux Linux affected a831f5bbc89a9978795504be9e1ff412043f8f77 f7b52afe3592eae66e160586b45a3f2242972c63 git Not specified
CNA Linux Linux affected 2.6.19 Not specified
CNA Linux Linux unaffected 2.6.19 semver Not specified
CNA Linux Linux unaffected 5.15.210 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.176 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.143 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.93 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.35 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.12 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/12d957979e4a800167842f1b42be6a606d227ebe 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f8aabed3ff3e986920cf02a2a2785e08e586b234 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ff375ed1cba81392346c5bfbf0bb7a13b2946f99 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9b6dcc0a39fd71752937f0b6b3973e1416085dcf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1a11eb7431e3d2882f5bd5939c5a9bbc65ccf4d1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f7b52afe3592eae66e160586b45a3f2242972c63 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/751db1b802a067b7fff25880f4e9f9152a171538 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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