FKIE_CVE-2026-64116

Vulnerability from fkie_nvd - Published: 2026-07-19 16:17 - Updated: 2026-07-20 15:17
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/09cbfd4b81ae90963dadb1de99b63b702e73290a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1dca7e491f070ac49b3d934f16ee953a53b37f38
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/902daac307eb7e1955ce05b071950f3cba88c963
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/abdd03229414b5a52943b65a60f34b84cea5ac59
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c7e8971abd70e9d022f1c251ba2508f8dc7f2db8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cf75eb6617042c8cff6112daeed7791809fc9dd2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d4ea0dfd75011b78cebf3808f98ac4c4f51a6fb9
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "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": [
            {
              "lessThan": "c7e8971abd70e9d022f1c251ba2508f8dc7f2db8",
              "status": "affected",
              "version": "9ee11f0fff205b4b3df9750bff5e94f97c71b6a0",
              "versionType": "git"
            },
            {
              "lessThan": "09cbfd4b81ae90963dadb1de99b63b702e73290a",
              "status": "affected",
              "version": "9ee11f0fff205b4b3df9750bff5e94f97c71b6a0",
              "versionType": "git"
            },
            {
              "lessThan": "1dca7e491f070ac49b3d934f16ee953a53b37f38",
              "status": "affected",
              "version": "9ee11f0fff205b4b3df9750bff5e94f97c71b6a0",
              "versionType": "git"
            },
            {
              "lessThan": "902daac307eb7e1955ce05b071950f3cba88c963",
              "status": "affected",
              "version": "9ee11f0fff205b4b3df9750bff5e94f97c71b6a0",
              "versionType": "git"
            },
            {
              "lessThan": "abdd03229414b5a52943b65a60f34b84cea5ac59",
              "status": "affected",
              "version": "9ee11f0fff205b4b3df9750bff5e94f97c71b6a0",
              "versionType": "git"
            },
            {
              "lessThan": "cf75eb6617042c8cff6112daeed7791809fc9dd2",
              "status": "affected",
              "version": "9ee11f0fff205b4b3df9750bff5e94f97c71b6a0",
              "versionType": "git"
            },
            {
              "lessThan": "d4ea0dfd75011b78cebf3808f98ac4c4f51a6fb9",
              "status": "affected",
              "version": "9ee11f0fff205b4b3df9750bff5e94f97c71b6a0",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/exthdrs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.15"
            },
            {
              "lessThan": "5.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.210",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.176",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.143",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.92",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.34",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "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": "2026-07-20T15:17:10.437",
  "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"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-07-19T16:17:53.103",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/09cbfd4b81ae90963dadb1de99b63b702e73290a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1dca7e491f070ac49b3d934f16ee953a53b37f38"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/902daac307eb7e1955ce05b071950f3cba88c963"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/abdd03229414b5a52943b65a60f34b84cea5ac59"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c7e8971abd70e9d022f1c251ba2508f8dc7f2db8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/cf75eb6617042c8cff6112daeed7791809fc9dd2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d4ea0dfd75011b78cebf3808f98ac4c4f51a6fb9"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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