{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-53184",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-53184"
  ],
  "published": "2026-06-25T08:41:40Z",
  "summary": "udp: clear skb->dev before running a sockmap verdict",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nudp: clear skb->dev before running a sockmap verdict\n\nOn the UDP receive path skb->dev is repurposed as dev_scratch (the\ntruesize/state cache set by udp_set_dev_scratch()), through the\nunion { struct net_device *dev; unsigned long dev_scratch; } in sk_buff.\n\nWhen a UDP socket is in a sockmap, sk_data_ready is\nsk_psock_verdict_data_ready(), which calls udp_read_skb() -> recv_actor()\n(sk_psock_verdict_recv) to run the attached SK_SKB verdict program in softirq.\nIf that program calls a socket-lookup helper (bpf_sk_lookup_tcp/udp,\nbpf_skc_lookup_tcp), bpf_skc_lookup() does:\n\n\tif (skb->dev)\n\t\tcaller_net = dev_net(skb->dev);\n\nskb->dev still holds the dev_scratch value (a non-NULL integer), so dev_net()\ndereferences it as a struct net_device * and the kernel takes a general\nprotection fault on a non-canonical address in softirq:\n\n  Oops: general protection fault, probably for non-canonical address 0x1010000800004a0\n  CPU: 1 UID: 0 PID: 1406 Comm: syz.2.19 Not tainted 7.1.0-rc6 #1 PREEMPT(full)\n  RIP: 0010:bpf_skc_lookup net/core/filter.c:7033 [inline]\n  RIP: 0010:bpf_sk_lookup+0x45/0x160 net/core/filter.c:7047\n  Call Trace:\n   <IRQ>\n   bpf_prog_4675cb904b7071f8+0x12e/0x14e\n   bpf_prog_run_pin_on_cpu+0xc6/0x1f0\n   sk_psock_verdict_recv+0x1ba/0x350\n   udp_read_skb+0x31a/0x370\n   sk_psock_verdict_data_ready+0x2e3/0x600\n   __udp_enqueue_schedule_skb+0x4c8/0x650\n   udpv6_queue_rcv_one_skb+0x3ec/0x740\n   udp6_unicast_rcv_skb+0x11d/0x140\n   ip6_protocol_deliver_rcu+0x61e/0x950\n   ip6_input_finish+0xa9/0x150\n   NF_HOOK+0x286/0x2f0\n   ip6_input+0x117/0x220\n   NF_HOOK+0x286/0x2f0\n   __netif_receive_skb+0x85/0x200\n   process_backlog+0x374/0x9a0\n   __napi_poll+0x4f/0x1c0\n   net_rx_action+0x3b0/0x770\n   handle_softirqs+0x15a/0x460\n   do_softirq+0x57/0x80\n   </IRQ>\n\nThe rmem charge that dev_scratch accounted for is released by skb_recv_udp() on\ndequeue, just above, so the scratch is dead by the time recv_actor() runs. Clear\nskb->dev so bpf_skc_lookup() falls back to sock_net(skb->sk), which\nskb_set_owner_sk_safe() set just above.",
  "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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          "1:6.18.34-1+rpt1": {
            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.36"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-53184"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/263779a6beff03b8b06f6d25566cb0f45af361f2"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1b585673a2249f13678e7ac443ac683ba767e0b6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/90d35188aaa92b8f8b23f66335e0e91bf60103a3"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6822eed69572000a181fa4e31fceacc60918c471"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7d6d92d000ebe3a845a17c165c1d3a70c5d84fe1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3c94f241f776562c489876ff506f366224565c21"
    }
  ],
  "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": 7.5,
      "cvss_v3_severity": "High",
      "scenario": "AV:N - The vulnerable code is reached on the IPv4/IPv6 UDP receive path when a packet is delivered to a UDP socket using sockmap verdict handling. In a reasonable deployment where such a socket is exposed by a service, a remote sender can trigger the path with UDP traffic.\nAC:L - There is no race or timing requirement; once the UDP socket has a SK_SKB sockmap verdict program that calls a socket-lookup helper, a received UDP packet reliably drives the stale skb->dev dereference. The required sockmap/verdict configuration is a deployment condition, not an attacker-controlled race.\nPR:N - A network attacker sending to an already configured UDP sockmap endpoint needs no local account or authentication. Creating the sockmap/BPF setup locally is privilege-gated by CAP_NET_ADMIN/CAP_BPF, but that is not required for the remote trigger scenario.\nUI:N - No victim user action is required after the affected service/socket is present. Packet receipt alone invokes the data-ready callback and verdict program.\nS:U - The impact remains within the kernel/network stack security authority. There is no VM escape, sandbox boundary crossing, or separate security scope involved.\nC:N - The bug misinterprets UDP dev_scratch metadata as a struct net_device pointer and faults during dev_net()/ifindex access. I found no usable information disclosure or attacker-controlled read primitive.\nI:N - The investigated path is an invalid pointer dereference, not a use-after-free or out-of-bounds write. I found no attacker-controlled write, data modification, or control-flow hijack primitive.\nA:H - The documented failure is a kernel general protection fault/oops in softirq. It is repeatable with UDP packets against the affected sockmap verdict configuration, causing high availability impact."
    }
  }
}