CVE-2026-64116 ipv6: ioam: add NULL check for idev in ipv6_hop_ioam()

What is CVE-2026-64116?

CVE-2026-64116 is a high-severity 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: ioam: add NULL check for idev in ipv6_hop_ioam()

Reported by Sashiko:

The function ipv6_hop_ioam() accesses __in6_dev_get(skb->dev)->cnf.ioam6_enabled without validating the returned idev pointer. Because addrconf_ifdown() can concurrently clear dev->ip6_ptr via RCU, __in6_dev_get() can return NULL during interface teardown, which could cause a NULL pointer dereference when processing an IOAM Hop-by-Hop option.

Let's add a check and use SKB_DROP_REASON_IPV6DISABLED accordingly.

Weakness: CWE-476

Which versions are affected by CVE-2026-64116?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-64116?

Apply the vendor's patch.

Is CVE-2026-64116 being exploited?

There is no known exploitation of CVE-2026-64116 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-2026-64116, DEBIAN-CVE-2026-64116, GHSA-6p6q-g32r-gx25, ROOT-OS-UBUNTU-2204-CVE-2026-64116, UBUNTU-CVE-2026-64116.