CVE-2026-64116
Published Jul 19, 2026
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.
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References
Other 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
Frequently Asked Questions
What is CVE-2026-64116? +
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.
How do I check if I'm vulnerable to CVE-2026-64116? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.