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

What is CVE-2026-63924?

CVE-2026-63924 is a critical vulnerability in Linux kernel, published on 19 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-416, CWE-822

Which versions are affected by CVE-2026-63924?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-63924?

Apply the vendor's patch.

Is CVE-2026-63924 being exploited?

There is no known exploitation of CVE-2026-63924 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BELL-CVE-2026-63924, DEBIAN-CVE-2026-63924, GHSA-4j34-532j-f693, ROOT-OS-UBUNTU-2204-CVE-2026-63924, UBUNTU-CVE-2026-63924.