Vulnerability-Lookup

FKIE_CVE-2026-64116

Vulnerability from fkie_nvd - Published: 2026-07-19 16:17 - Updated: 2026-08-12 15:50

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Summary

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

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/09cbfd4b81ae90963dadb1de99b63b702e73290a	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/1dca7e491f070ac49b3d934f16ee953a53b37f38	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/902daac307eb7e1955ce05b071950f3cba88c963	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/abdd03229414b5a52943b65a60f34b84cea5ac59	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c7e8971abd70e9d022f1c251ba2508f8dc7f2db8	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/cf75eb6617042c8cff6112daeed7791809fc9dd2	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/d4ea0dfd75011b78cebf3808f98ac4c4f51a6fb9	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	7.1
linux	linux_kernel	7.1
linux	linux_kernel	7.1
linux	linux_kernel	7.1

JSON

To clipboard

{
  "affected": [
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      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/exthdrs.c"
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        }
      ],
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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: ioam: add NULL check for idev in ipv6_hop_ioam()\n\nReported by Sashiko:\n\nThe function ipv6_hop_ioam() accesses\n__in6_dev_get(skb-\u003edev)-\u003ecnf.ioam6_enabled without validating the returned\nidev pointer. Because addrconf_ifdown() can concurrently clear dev-\u003eip6_ptr\nvia RCU, __in6_dev_get() can return NULL during interface teardown, which\ncould cause a NULL pointer dereference when processing an IOAM Hop-by-Hop\noption.\n\nLet\u0027s add a check and use SKB_DROP_REASON_IPV6DISABLED accordingly."
    }
  ],
  "id": "CVE-2026-64116",
  "lastModified": "2026-08-12T15:50:06.733",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
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        "impactScore": 3.6,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
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  "published": "2026-07-19T16:17:53.103",
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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        {
          "lang": "en",
          "value": "CWE-476"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2026-64116 (GCVE-0-2026-64116)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:40 – Updated: 2026-08-05 12:39

Title

ipv6: ioam: add NULL check for idev in ipv6_hop_ioam()

Summary

Severity

7.5 (High)


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

Assigner

Linux mitre root

References

7 references

URL	Tags
https://git.kernel.org/stable/c/c7e8971abd70e9d02…
https://git.kernel.org/stable/c/09cbfd4b81ae90963…
https://git.kernel.org/stable/c/1dca7e491f070ac49…
https://git.kernel.org/stable/c/902daac307eb7e195…
https://git.kernel.org/stable/c/abdd03229414b5a52…
https://git.kernel.org/stable/c/cf75eb6617042c8cf…
https://git.kernel.org/stable/c/d4ea0dfd75011b78c…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0 , < c7e8971abd70e9d022f1c251ba2508f8dc7f2db8 (git) Affected: 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0 , < 09cbfd4b81ae90963dadb1de99b63b702e73290a (git) Affected: 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0 , < 1dca7e491f070ac49b3d934f16ee953a53b37f38 (git) Affected: 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0 , < 902daac307eb7e1955ce05b071950f3cba88c963 (git) Affected: 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0 , < abdd03229414b5a52943b65a60f34b84cea5ac59 (git) Affected: 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0 , < cf75eb6617042c8cff6112daeed7791809fc9dd2 (git) Affected: 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0 , < d4ea0dfd75011b78cebf3808f98ac4c4f51a6fb9 (git)
Linux	Linux	Affected: 5.15 Unaffected: 0 , < 5.15 (semver) Unaffected: 5.15.210 , ≤ 5.15.* (semver) Unaffected: 6.1.176 , ≤ 6.1.* (semver) Unaffected: 6.6.143 , ≤ 6.6.* (semver) Unaffected: 6.12.92 , ≤ 6.12.* (semver) Unaffected: 6.18.34 , ≤ 6.18.* (semver) Unaffected: 7.0.11 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/exthdrs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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        }
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            {
              "lang": "en",
              "value": "AV:N - The bug is in the IPv6 receive path (ipv6_rcv \u2192 ip6_rcv_core \u2192 ipv6_parse_hopopts \u2192 ipv6_hop_ioam), triggered by a remotely deliverable IPv6 packet with a Hop-by-Hop IOAM option.\nAC:L - An attacker can reliably win the TOCTOU race by flooding IOAM Hop-by-Hop packets while concurrently unregistering the netdev (e.g., via user namespace with CAP_NET_ADMIN and `ip link del`), controlling both sides of the race.\nPR:N - No kernel privileges are required to send crafted IPv6 packets; interface unregister also occurs during normal container/pod lifecycle on shared cloud hosts without attacker admin action.\nUI:N - Exploitation requires only sending network packets during interface teardown and does not depend on any victim user action.\nS:U - Impact is a kernel NULL dereference and crash on the receiving host; it does not cross a VM, container, or IOMMU security boundary.\nC:N - The fault is a NULL pointer read at a fixed offset (idev-\u003ecnf.ioam6_enabled), causing an immediate page fault with no controlled or bounded information disclosure.\nI:N - This is a read-side NULL dereference only; there is no memory corruption, arbitrary write, or code execution primitive.\nA:H - A successful trigger causes a kernel NULL pointer dereference, producing an oops or panic and denying service on the affected system."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:39:25.437Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c7e8971abd70e9d022f1c251ba2508f8dc7f2db8"
        },
        {
          "url": "https://git.kernel.org/stable/c/09cbfd4b81ae90963dadb1de99b63b702e73290a"
        },
        {
          "url": "https://git.kernel.org/stable/c/1dca7e491f070ac49b3d934f16ee953a53b37f38"
        },
        {
          "url": "https://git.kernel.org/stable/c/902daac307eb7e1955ce05b071950f3cba88c963"
        },
        {
          "url": "https://git.kernel.org/stable/c/abdd03229414b5a52943b65a60f34b84cea5ac59"
        },
        {
          "url": "https://git.kernel.org/stable/c/cf75eb6617042c8cff6112daeed7791809fc9dd2"
        },
        {
          "url": "https://git.kernel.org/stable/c/d4ea0dfd75011b78cebf3808f98ac4c4f51a6fb9"
        }
      ],
      "title": "ipv6: ioam: add NULL check for idev in ipv6_hop_ioam()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64116",
    "datePublished": "2026-07-19T15:40:16.240Z",
    "dateReserved": "2026-07-19T07:54:57.035Z",
    "dateUpdated": "2026-08-05T12:39:25.437Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

FKIE_CVE-2026-64116

CVE-2026-64116 (GCVE-0-2026-64116)

Tags

Sightings

Nomenclature