Critical 9.8Published Jul 19, 2026

CVE-2026-63922ipv6: exthdrs: refresh nh after handling HAO option

Updated under an hour ago (Oct 28, 2026, 1:00 PM ET)

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Exploited in the last 30 days

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.

CVSS: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-416
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from a831f5bbc89a9978795504be9e1ff412043f8f77 before b3ac54e5c905f86d22b502eacb5686a282c5659f; from a831f5bbc89a9978795504be9e1ff412043f8f77 before f8aabed3ff3e986920cf02a2a2785e08e586b234; from a831f5bbc89a9978795504be9e1ff412043f8f77 before 1a11eb7431e3d2882f5bd5939c5a9bbc65ccf4d1; from a831f5bbc89a9978795504be9e1ff412043f8f77 before 12d957979e4a800167842f1b42be6a606d227ebe; from a831f5bbc89a9978795504be9e1ff412043f8f77 before ff375ed1cba81392346c5bfbf0bb7a13b2946f99; from a831f5bbc89a9978795504be9e1ff412043f8f77 before 751db1b802a067b7fff25880f4e9f9152a171538; from a831f5bbc89a9978795504be9e1ff412043f8f77 before 9b6dcc0a39fd71752937f0b6b3973e1416085dcf; from a831f5bbc89a9978795504be9e1ff412043f8f77 before f7b52afe3592eae66e160586b45a3f2242972c63	CNA record
linux linux_kernel linux:linux_kernel	from 2.6.19 before 5.10.259; from 5.11 before 5.15.210; from 5.16 before 6.1.176; from 6.2 before 6.6.143; from 6.7 before 6.12.93; from 6.13 before 6.18.35; from 6.19 before 7.0.12; 7.1; and 4 more ranges	NVD

References

References

https://git.kernel.org/stable/c/b3ac54e5c905f86d22b502eacb5686a282c5659f	patch
https://git.kernel.org/stable/c/f8aabed3ff3e986920cf02a2a2785e08e586b234	patch
https://git.kernel.org/stable/c/1a11eb7431e3d2882f5bd5939c5a9bbc65ccf4d1	patch
https://git.kernel.org/stable/c/12d957979e4a800167842f1b42be6a606d227ebe	patch
https://git.kernel.org/stable/c/ff375ed1cba81392346c5bfbf0bb7a13b2946f99	patch
https://git.kernel.org/stable/c/751db1b802a067b7fff25880f4e9f9152a171538	patch
https://git.kernel.org/stable/c/9b6dcc0a39fd71752937f0b6b3973e1416085dcf	patch
https://git.kernel.org/stable/c/f7b52afe3592eae66e160586b45a3f2242972c63	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.