{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64116",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-64116"
  ],
  "published": "2026-07-19T15:41:06Z",
  "summary": "ipv6: ioam: add NULL check for idev in ipv6_hop_ioam()",
  "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->dev)->cnf.ioam6_enabled without validating the returned\nidev pointer. Because addrconf_ifdown() can concurrently clear dev->ip6_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's add a check and use SKB_DROP_REASON_IPV6DISABLED accordingly.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
    }
  ],
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      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-64116"
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    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.5,
      "cvss_v3_severity": "High",
      "scenario": "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->cnf.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."
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}