Critical severity · published Jul 19, 2026
CVE-2026-63922
ipv6: exthdrs: refresh nh after handling HAO option
9.8
CVSS
0.7%
EPSS
No
On KEV
Description
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 53% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KE
Kernel · Linux
2.6.19 before 5.10.259; 5.11 before 5.15.210; 5.16 before 6.1.176; 6.2 before 6.6.143; 6.7 before 6.12.93; 6.13 before 6.18.35; +6 more · source: NVD
LI
Linux · Linux
a831f5bbc89a9978795504be9e1ff412043f8f77 before b3ac54e5c905f86d22b502eacb5686a282c5659f; a831f5bbc89a9978795504be9e1ff412043f8f77 before f8aabed3ff3e986920cf02a2a2785e08e586b234; a831f5bbc89a9978795504be9e1ff412043f8f77 before 1a11eb7431e3d2882f5bd5939c5a9bbc65ccf4d1; a831f5bbc89a9978795504be9e1ff412043f8f77 before 12d957979e4a800167842f1b42be6a606d227ebe; a831f5bbc89a9978795504be9e1ff412043f8f77 before ff375ed1cba81392346c5bfbf0bb7a13b2946f99; a831f5bbc89a9978795504be9e1ff412043f8f77 before 751db1b802a067b7fff25880f4e9f9152a171538; +3 more · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-63922
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-63922
Patch
https://git.kernel.org/stable/c/12d957979e4a800167842f1b42be6a606d227ebe
Patch
https://git.kernel.org/stable/c/1a11eb7431e3d2882f5bd5939c5a9bbc65ccf4d1
Patch
https://git.kernel.org/stable/c/751db1b802a067b7fff25880f4e9f9152a171538
Patch
https://git.kernel.org/stable/c/9b6dcc0a39fd71752937f0b6b3973e1416085dcf
Patch
https://git.kernel.org/stable/c/b3ac54e5c905f86d22b502eacb5686a282c5659f
Patch
https://git.kernel.org/stable/c/f7b52afe3592eae66e160586b45a3f2242972c63
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