CVE-2026-63922 | In the Linux kernel, the following vulnerability has been re… | CVSS 9.8 CRITICAL

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.

Metadata

CVE ID: CVE-2026-63922
State: PUBLISHED
Assigner: Linux
Reserved: 2026-07-19 07:54 UTC
Published: 2026-07-19 14:55 UTC
Last updated: 2026-07-20 13:41 UTC
Vendor / Product: Linux / Linux
Sources: cve.org · NVD

Severity & Metrics

9.8 CRITICAL CVSS 3.1

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

Affected products (2)

Vendor	Product	Platform	Versions
Linux	Linux	—	a831f5bbc89a9978795504be9e1ff412043f8f77 < f8aabed3ff3e986920cf02a2a2785e08e586b234, a831f5bbc89a9978795504be9e1ff412043f8f77 < 1a11eb7431e3d2882f5bd5939c5a9bbc65ccf4d1, a831f5bbc89a9978795504be9e1ff412043f8f77 < 12d957979e4a800167842f1b42be6a606d227ebe, a831f5bbc89a9978795504be9e1ff412043f8f77 < ff375ed1cba81392346c5bfbf0bb7a13b2946f99 …
Linux	Linux	—	2.6.19, 0 < 2.6.19, 5.15.210 ≤ 5.15., 6.1.176 ≤ 6.1. …

CVSS scores (1)

Score	Severity	Version	Source	Vector
9.8	CRITICAL	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References (7)