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Vulnerability record · CVE-2026-64116 · published 19 July 2026

CVE-2026-64116: Linux kernel null pointer dereference vulnerability

Linux · Linux Kernel

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.

7.5 CVSS 3.1 High EPSS 0.70% · top 48.8% CWE-476 · NULL pointer dereference
7.5CVSS 3.1 base score
0.70%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
7References
12 Aug 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-64116), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.