by Kastro CVE-2026-63922
Linux Linux — ipv6: exthdrs: refresh nh after handling HAO option
Description · from the CVE record
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.
Affected
ProductAffectedFixed inSource
Linuxa831f5bbc89a9978795504be9e1ff412043f8f77 – < b3ac54e5c905f86d22b502eacb5686a282c5659fb3ac54e5c905f86d22b502eacb5686a282c5659fCNA
Linuxa831f5bbc89a9978795504be9e1ff412043f8f77 – < f8aabed3ff3e986920cf02a2a2785e08e586b234f8aabed3ff3e986920cf02a2a2785e08e586b234CNA
Linuxa831f5bbc89a9978795504be9e1ff412043f8f77 – < 1a11eb7431e3d2882f5bd5939c5a9bbc65ccf4d11a11eb7431e3d2882f5bd5939c5a9bbc65ccf4d1CNA
Linuxa831f5bbc89a9978795504be9e1ff412043f8f77 – < 12d957979e4a800167842f1b42be6a606d227ebe12d957979e4a800167842f1b42be6a606d227ebeCNA
Linuxa831f5bbc89a9978795504be9e1ff412043f8f77 – < ff375ed1cba81392346c5bfbf0bb7a13b2946f99ff375ed1cba81392346c5bfbf0bb7a13b2946f99CNA
Linuxa831f5bbc89a9978795504be9e1ff412043f8f77 – < 751db1b802a067b7fff25880f4e9f9152a171538751db1b802a067b7fff25880f4e9f9152a171538CNA
Linuxa831f5bbc89a9978795504be9e1ff412043f8f77 – < 9b6dcc0a39fd71752937f0b6b3973e1416085dcf9b6dcc0a39fd71752937f0b6b3973e1416085dcfCNA
Linuxa831f5bbc89a9978795504be9e1ff412043f8f77 – < f7b52afe3592eae66e160586b45a3f2242972c63f7b52afe3592eae66e160586b45a3f2242972c63CNA
Linux2.6.19–CNA
Scores by source
Linux (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total