What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-19 · updated 2026-08-12
• Weakness: CWE-476

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.

Affected products

• Linux kernel: from 5.15 before 5.15.210; from 5.16 before 6.1.176; from 6.2 before 6.6.143; from 6.7 before 6.12.92; from 6.13 before 6.18.34; from 6.19 before 7.0.11 — fixed in 5.15.210, 6.1.176, 6.12.92, 6.18.34, 6.6.143, 7.0.11

How to fix

Upgrade to a fixed version: Linux kernel 5.15.210, 6.1.176, 6.12.92, 6.18.34. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/09cbfd4b81ae90963dadb1de99b63b702e73290a
• https://git.kernel.org/stable/c/1dca7e491f070ac49b3d934f16ee953a53b37f38
• https://git.kernel.org/stable/c/902daac307eb7e1955ce05b071950f3cba88c963
• https://git.kernel.org/stable/c/abdd03229414b5a52943b65a60f34b84cea5ac59
• https://git.kernel.org/stable/c/c7e8971abd70e9d022f1c251ba2508f8dc7f2db8
• https://git.kernel.org/stable/c/cf75eb6617042c8cff6112daeed7791809fc9dd2
• https://git.kernel.org/stable/c/d4ea0dfd75011b78cebf3808f98ac4c4f51a6fb9

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