CVE-2026-63922critical

ipv6: exthdrs: refresh nh after handling HAO option

28Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 9.8epss 0.7%

exploitation probability

0.7%top 50% of all CVEs

observed exploitation

nono source reports it

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

Affected products

Linux · Linux

References

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