{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64132",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-64132"
  ],
  "published": "2026-07-19T15:41:06Z",
  "summary": "ipv6: ioam: refresh hdr pointer before ioam6_event()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: ioam: refresh hdr pointer before ioam6_event()\n\nReported by Sashiko:\n\nIn ipv6_hop_ioam(), the hdr pointer is initialized to point into the\nskb's linear data buffer. Later, the code calls skb_ensure_writable(),\nwhich might reallocate the buffer:\n\n\tif (skb_ensure_writable(skb, optoff + 2 + hdr->opt_len))\n\t\tgoto drop;\n\n\t/* Trace pointer may have changed */\n\ttrace = (struct ioam6_trace_hdr *)(skb_network_header(skb)\n\t\t\t\t\t   + optoff + sizeof(*hdr));\n\n\tioam6_fill_trace_data(skb, ns, trace, true);\n\n\tioam6_event(IOAM6_EVENT_TRACE, dev_net(skb->dev),\n\t\t    GFP_ATOMIC, (void *)trace, hdr->opt_len - 2);\n\nIf the skb is cloned or lacks sufficient linear headroom,\nskb_ensure_writable() will invoke pskb_expand_head(), which reallocates\nthe skb's data buffer and frees the old one, invalidating pointers to\nit. While the code recalculates the trace pointer immediately after the\ncall to skb_ensure_writable(), it fails to recalculate the hdr pointer.\n\nThis patch fixes the above by recalculating the hdr pointer before\npassing hdr->opt_len to ioam6_event(), so that we avoid any UaF.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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          "1:6.12.75-1+rpt1": {
            "linux_commit": "89050b1059997d38d55462b323b099a6436dc10d",
            "upstream_version": "6.12.75",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.92"
          },
          "1:6.18.29-1+rpt1": {
            "linux_commit": "66318c5b5cd8145a662303af12ed39ac07eb27cc",
            "upstream_version": "6.18.29",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.34"
          },
          "1:6.18.33-1+rpt1": {
            "linux_commit": "95b85bebbedcaedfa7ca79116ed38b7376fba412",
            "upstream_version": "6.18.33",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.34"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-64132"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/769723124b7c3b2bfea4cf68ad292698b87c8d01"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/24de676da63c1122d2c13b0d546238b66d1b4e62"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5af905aa8e91ff8d94572a1e089558f21dcf24ed"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e46e6bc97fb1f339730ff1ba74267fbf48e7a422"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.8,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - The bug is in `ipv6_hop_ioam()`, reached from `ipv6_rcv()` \u2192 `ip6_rcv_core()` \u2192 `ipv6_parse_hopopts()` \u2192 `ip6_parse_tlv()` when processing IPv6 hop-by-hop IOAM options on ingress. A remote attacker can deliver the trigger with a crafted IPv6 packet to any internet-facing or LAN-reachable host/router that has IOAM ingress enabled.\nAC:L - Exploitation requires `skb_ensure_writable()` to reallocate via `pskb_expand_head()`, which occurs when the skb is cloned (e.g., bridge flooding/multicast forwarding sets `skb->cloned` on the original before local delivery to the IP stack). An attacker can reliably create this condition with concurrent traffic/topology choices rather than depending on uncontrollable timing or memory layout.\nPR:N - The attacker needs no privileges on the victim system\u2014only the ability to send IPv6 packets. IOAM namespace/sysctl configuration is a victim-side deployment prerequisite (typical on carrier/ISP telemetry nodes), not a privilege the attacker must hold.\nUI:N - Exploitation is fully attacker-driven by sending a malicious IPv6 packet and requires no action from a victim user.\nS:U - The vulnerability is a kernel heap use-after-free in IPv6 packet processing; successful exploitation would compromise the kernel/host itself, not cross a separate security authority such as a VM guest-to-host or sandbox boundary.\nC:H - After `pskb_expand_head()` frees the old skb buffer, the stale `hdr` pointer is dereferenced for `hdr->opt_len`, constituting a use-after-free read of freed kernel memory; that attacker-influenced length is then used in `ioam6_event_put_trace()`/`nla_put()`, enabling out-of-bounds kernel memory reads and information disclosure.\nI:H - Use-after-free of heap metadata enables memory corruption primitives; the corrupted `opt_len` fed into netlink attribute construction can cause out-of-bounds reads whose contents are attacker-influenced, and UAF bugs in skb handling are classically leveragable toward arbitrary kernel write/code execution.\nA:H - Reading freed memory and passing a corrupted length into `nla_put()` can cause kernel oops/panic (especially with KASAN/overflow checks), and UAF conditions inherently risk system crashes even when full exploitation is not attempted."
    }
  }
}