What’s Vulnerable › Vulnerabilities

CVE-2026-63924: ipv6: exthdrs: refresh nh pointer after ipv6_hop_jumbo()

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-19 · updated 2026-10-22
• Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: ipv6: exthdrs: refresh nh pointer after ipv6_hop_jumbo() ipv6_hop_jumbo() calls pskb_trim_rcsum(), which can change skb pointers. Let's recompute nh pointer to make sure any change won't mess things up.

Affected products

• Linux kernel: from 2.6.12.1 before 5.10.259; from 5.11 before 5.15.210; from 5.16 before 6.1.176; from 6.2 before 6.6.143; from 6.7 before 6.12.93; from 6.13 before 6.18.35 — fixed in 5.10.259, 5.15.210, 6.1.176, 6.12.93, 6.18.35, 6.6.143

How to fix

Upgrade to a fixed version: Linux kernel 5.10.259, 5.15.210, 6.1.176, 6.12.93. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/2b56bbd928c030894c270cd33d60286326919458
• https://git.kernel.org/stable/c/645b99b1a185c91a79bdac4c5de0f91b212d64f0
• https://git.kernel.org/stable/c/72af7beae774e46ed543f3f2f267bf0a141bfcdd
• https://git.kernel.org/stable/c/9e883eaa878f4337b5873c706efb5a192364ed18
• https://git.kernel.org/stable/c/b3ac54e5c905f86d22b502eacb5686a282c5659f
• https://git.kernel.org/stable/c/bddaa4dfc7f36e1ee343a0622f69288af2b9ace9
• https://git.kernel.org/stable/c/c512e1c819dfbf6ae95ee7a44b65b9ad98979157
• https://git.kernel.org/stable/c/d47548a36639095939f4747d4c43f2271366f565

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