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.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.0018.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
9ee11f0fff205b4b3df9750bff5e94f97c71b6a0 affected < c7e8971abd70e9d022f1c251ba2508f8dc7f2db8
9ee11f0fff205b4b3df9750bff5e94f97c71b6a0 affected < 09cbfd4b81ae90963dadb1de99b63b702e73290a
9ee11f0fff205b4b3df9750bff5e94f97c71b6a0 affected < 1dca7e491f070ac49b3d934f16ee953a53b37f38
9ee11f0fff205b4b3df9750bff5e94f97c71b6a0 affected < 902daac307eb7e1955ce05b071950f3cba88c963
9ee11f0fff205b4b3df9750bff5e94f97c71b6a0 affected < abdd03229414b5a52943b65a60f34b84cea5ac59
9ee11f0fff205b4b3df9750bff5e94f97c71b6a0 affected < cf75eb6617042c8cff6112daeed7791809fc9dd2
9ee11f0fff205b4b3df9750bff5e94f97c71b6a0 affected < d4ea0dfd75011b78cebf3808f98ac4c4f51a6fb9
Linux Linux affected
Version Status Constraints
5.15 affected —
0 unaffected < 5.15
5.15.210 unaffected ≤ 5.15.*
6.1.176 unaffected ≤ 6.1.*
6.6.143 unaffected ≤ 6.6.*
6.12.92 unaffected ≤ 6.12.*
6.18.34 unaffected ≤ 6.18.*
7.0.11 unaffected ≤ 7.0.*
7.1 unaffected ≤ *

No data.

No data.

No data.

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Advisories

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Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://git.kernel.org/stable/c/09cbfd4b81ae90963dadb1de99b63b702e73290a cve-icon
https://git.kernel.org/stable/c/1dca7e491f070ac49b3d934f16ee953a53b37f38 cve-icon
https://git.kernel.org/stable/c/902daac307eb7e1955ce05b071950f3cba88c963 cve-icon
https://git.kernel.org/stable/c/abdd03229414b5a52943b65a60f34b84cea5ac59 cve-icon
https://git.kernel.org/stable/c/c7e8971abd70e9d022f1c251ba2508f8dc7f2db8 cve-icon
https://git.kernel.org/stable/c/cf75eb6617042c8cff6112daeed7791809fc9dd2 cve-icon
https://git.kernel.org/stable/c/d4ea0dfd75011b78cebf3808f98ac4c4f51a6fb9 cve-icon
https://lore.kernel.org/linux-cve-announce/2026071923-CVE-2026-64116-59bb@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-64116 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-64116 cve-icon
History

Mon, 20 Jul 2026 14:45:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

 cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Mon, 20 Jul 2026 12:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-476
References
Metrics threat_severity

None

 cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Moderate

Sun, 19 Jul 2026 16:15:00 +0000

Type Values Removed Values Added
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.
Title ipv6: ioam: add NULL check for idev in ipv6_hop_ioam()
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-07-20T13:43:30.328Z

Reserved: 2026-07-19T07:54:57.035Z

Link: CVE-2026-64116

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-07-19T00:00:00Z

Links: CVE-2026-64116 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses