CVE-2026-64116

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.

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