CVE-2026-63922 PUBLISHED

ipv6: exthdrs: refresh nh after handling HAO option

Assigner: Linux
Reserved: 19.07.2026 Published: 19.07.2026 Updated: 20.07.2026

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.

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS Score: 9.8

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from a831f5bbc89a9978795504be9e1ff412043f8f77 to f8aabed3ff3e986920cf02a2a2785e08e586b234 (excl.)
  • affected from a831f5bbc89a9978795504be9e1ff412043f8f77 to 1a11eb7431e3d2882f5bd5939c5a9bbc65ccf4d1 (excl.)
  • affected from a831f5bbc89a9978795504be9e1ff412043f8f77 to 12d957979e4a800167842f1b42be6a606d227ebe (excl.)
  • affected from a831f5bbc89a9978795504be9e1ff412043f8f77 to ff375ed1cba81392346c5bfbf0bb7a13b2946f99 (excl.)
  • affected from a831f5bbc89a9978795504be9e1ff412043f8f77 to 751db1b802a067b7fff25880f4e9f9152a171538 (excl.)
  • affected from a831f5bbc89a9978795504be9e1ff412043f8f77 to 9b6dcc0a39fd71752937f0b6b3973e1416085dcf (excl.)
  • affected from a831f5bbc89a9978795504be9e1ff412043f8f77 to f7b52afe3592eae66e160586b45a3f2242972c63 (excl.)
Vendor Linux
Product Linux
Versions Default: affected
  • Version 2.6.19 is affected
  • unaffected from 0 to 2.6.19 (excl.)
  • unaffected from 5.15.210 to 5.15.* (incl.)
  • unaffected from 6.1.176 to 6.1.* (incl.)
  • unaffected from 6.6.143 to 6.6.* (incl.)
  • unaffected from 6.12.93 to 6.12.* (incl.)
  • unaffected from 6.18.35 to 6.18.* (incl.)
  • unaffected from 7.0.12 to 7.0.* (incl.)
  • unaffected from 7.1 to * (incl.)

References