GHSA-6P6Q-G32R-GX25

Vulnerability from github – Published: 2026-07-19 18:31 – Updated: 2026-07-20 15:32
VLAI
Details

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.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-64116"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-19T16:17:53Z",
    "severity": "HIGH"
  },
  "details": "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": "GHSA-6p6q-g32r-gx25",
  "modified": "2026-07-20T15:32:00Z",
  "published": "2026-07-19T18:31:52Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64116"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/09cbfd4b81ae90963dadb1de99b63b702e73290a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1dca7e491f070ac49b3d934f16ee953a53b37f38"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/902daac307eb7e1955ce05b071950f3cba88c963"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/abdd03229414b5a52943b65a60f34b84cea5ac59"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c7e8971abd70e9d022f1c251ba2508f8dc7f2db8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cf75eb6617042c8cff6112daeed7791809fc9dd2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d4ea0dfd75011b78cebf3808f98ac4c4f51a6fb9"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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