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CVE-2026-63922

9.8 · CRITICAL

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.

Published Jul 19, 2026EPSS 0.71%

Overview

CVE-2026-63922 is a critical-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/12d957979e4a800167842f1b42be6a606d227ebeRefgit.kernel.org/stable/c/1a11eb7431e3d2882f5bd5939c5a9bbc65ccf4d1Refgit.kernel.org/stable/c/751db1b802a067b7fff25880f4e9f9152a171538Refgit.kernel.org/stable/c/9b6dcc0a39fd71752937f0b6b3973e1416085dcfRefgit.kernel.org/stable/c/b3ac54e5c905f86d22b502eacb5686a282c5659fRefgit.kernel.org/stable/c/f7b52afe3592eae66e160586b45a3f2242972c63Refgit.kernel.org/stable/c/f8aabed3ff3e986920cf02a2a2785e08e586b234Refgit.kernel.org/stable/c/ff375ed1cba81392346c5bfbf0bb7a13b2946f99

How CyberStrike helps

Frequently asked questions

What is CVE-2026-63922?

CVE-2026-63922 is a critical-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-63922?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-63922?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-63922?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-63922 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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