{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-72419",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-72419"
  ],
  "published": "2026-08-15T06:04:33Z",
  "summary": "netfilter: nf_nat: avoid invalid nat_net pointer use on failed nf_nat_init()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_nat: avoid invalid nat_net pointer use on failed nf_nat_init()\n\nWe ran into below KASAN splat, which is mostly uninteresting, beside\nfor having nf_nat_register_fn() in the call chain as a cause for the\noffending access:\n\n==================================================================\nBUG: KASAN: slab-out-of-bounds in nf_nat_register_fn+0x5f9/0x640\nRead of size 8 at addr ffff890031e54c20 by task iptables/9510\n\nCPU: 0 UID: 0 PID: 9510 Comm: iptables Not tainted 6.18.18-grsec-full-20260320181326 #1 PREEMPT(voluntary)\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\nCall Trace:\n <TASK>\n [\u2026] dump_stack_lvl+0xee/0x160 ffff88004117eeb8\n [\u2026] print_report+0x6e/0x640 ffff88004117eee0\n [\u2026] ? __phys_addr+0x8e/0x140 ffff88004117eef0\n [\u2026] ? kasan_addr_to_slab+0x51/0xe0 ffff88004117ef08\n [\u2026] ? complete_report_info+0xec/0x1c0 ffff88004117ef20\n [\u2026] ? nf_nat_register_fn+0x5f9/0x640 ffff88004117ef48\n [\u2026] kasan_report+0xbc/0x140 ffff88004117ef50\n [\u2026] ? nf_nat_register_fn+0x5f9/0x640 ffff88004117ef90\n [\u2026] nf_nat_register_fn+0x5f9/0x640 ffff88004117eff8\n [\u2026] ? nf_nat_icmp_reply_translation+0x6e0/0x6e0 ffff88004117f070\n [\u2026] nf_tables_register_hook.part.0+0xa0/0x220 ffff88004117f080\n [\u2026] nf_tables_addchain.constprop.0+0x1054/0x1fc0 ffff88004117f0b8\n [\u2026] ? nft_chain_lookup.part.0+0x4ce/0xac0 ffff88004117f130\n [\u2026] ? nf_tables_abort+0x3d80/0x3d80 ffff88004117f190\n [\u2026] ? nf_tables_dumpreset_obj+0x100/0x100 ffff88004117f1c8\n [\u2026] ? nft_table_lookup.part.0+0x255/0x300 ffff88004117f310\n [\u2026] ? nf_tables_newchain+0x21a4/0x2fa0 ffff88004117f358\n [\u2026] nf_tables_newchain+0x21a4/0x2fa0 ffff88004117f360\n [\u2026] ? nf_tables_addchain.constprop.0+0x1fc0/0x1fc0 ffff88004117f458\n [\u2026] ? nla_get_range_signed+0x4a0/0x4a0 ffff88004117f488\n [\u2026] ? lock_acquire+0x16f/0x320 ffff88004117f490\n [\u2026] ? find_held_lock+0x3b/0xe0 ffff88004117f4b0\n [\u2026] ? __nla_parse+0x45/0x80 ffff88004117f500\n [\u2026] nfnetlink_rcv_batch+0xbca/0x19a0 ffff88004117f550\n [\u2026] ? nfnetlink_net_exit_batch+0x120/0x120 ffff88004117f618\n [\u2026] ? __sanitizer_cov_trace_switch+0x63/0xe0 ffff88004117f720\n [\u2026] ? gr_acl_handle_mmap+0x1c4/0x320 ffff88004117f7c0\n [\u2026] ? nla_get_range_signed+0x4a0/0x4a0 ffff88004117f7e8\n [\u2026] ? gr_is_capable+0x6f/0xe0 ffff88004117f830\n [\u2026] ? __nla_parse+0x45/0x80 ffff88004117f860\n [\u2026] ? skb_pull+0x103/0x1a0 ffff88004117f880\n [\u2026] nfnetlink_rcv+0x3db/0x4a0 ffff88004117f8b0\n [\u2026] ? nfnetlink_rcv_batch+0x19a0/0x19a0 ffff88004117f8d8\n [\u2026] ? netlink_lookup+0xe2/0x240 ffff88004117f900\n [\u2026] netlink_unicast+0x74b/0xb00 ffff88004117f930\n [\u2026] ? netlink_attachskb+0xb20/0xb20 ffff88004117f980\n [\u2026] ? __check_object_size+0x3e/0xaa0 ffff88004117f998\n [\u2026] ? security_netlink_send+0x51/0x160 ffff88004117f9c8\n [\u2026] netlink_sendmsg+0xa03/0x1200 ffff88004117f9f8\n [\u2026] ? netlink_unicast+0xb00/0xb00 ffff88004117fa70\n [\u2026] ? netlink_unicast+0xb00/0xb00 ffff88004117fac8\n [\u2026] ? ____sys_sendmsg+0xe2a/0x1040 ffff88004117faf8\n [\u2026] ____sys_sendmsg+0xe2a/0x1040 ffff88004117fb00\n [\u2026] ? kernel_recvmsg+0x300/0x300 ffff88004117fb60\n [\u2026] ? reacquire_held_locks+0xe9/0x260 ffff88004117fbc8\n [\u2026] ___sys_sendmsg+0x138/0x200 ffff88004117fbf8\n [\u2026] ? do_recvmmsg+0x7e0/0x7e0 ffff88004117fc30\n [\u2026] ? lockdep_hardirqs_on_prepare+0x101/0x1e0 ffff88004117fc50\n [\u2026] ? lock_acquire+0x16f/0x320 ffff88004117fd20\n [\u2026] ? lock_acquire+0x16f/0x320 ffff88004117fd58\n [\u2026] ? find_held_lock+0x3b/0xe0 ffff88004117fd70\n [\u2026] __sys_sendmsg+0x17a/0x260 ffff88004117fdc8\n [\u2026] ? __sys_sendmsg_sock+0x80/0x80 ffff88004117fdf0\n [\u2026] ? syscall_trace_enter+0x15e/0x2c0 ffff88004117fe98\n [\u2026] do_syscall_64+0x7d/0x400 ffff88004117fec8\n [\u2026] entry_SYSCALL_64_safe_stack+0x4a/0x60 ffff88004117fef8\n </TASK>\n==================================================================\n\nThe out-of-bounds report, though, is a red herring as it is f\n---truncated---",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
  "affected": [
    {
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        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-72419"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/359d8ff97362a4662356104540e4814bff9dad7c"
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      "url": "https://git.kernel.org/stable/c/87f7a720de2545fdac29c85acb7163676feacdaf"
    },
    {
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      "url": "https://git.kernel.org/stable/c/e794f633021defcfa98e17d73b955cd07590831f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a73e7ac3f3b69e9581ec7bfd889ff3e9b8c773f7"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/eb14aba91163c33d8c99f9d7c06690e08b56a250"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/069cfe3de2a5e16069485893cd04665ab769c1d8"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:50:24Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The bug is reached via the netfilter netlink path (sendmsg on NETLINK_NETFILTER) when creating an nftables NAT chain; nf_tables_newchain -> nf_tables_register_hook -> nf_nat_register_fn. This is a local syscall/configuration interface, not remote packet handling.\nAC:L - Once nf_nat built-in init has failed and another per-net consumer reuses the stale nat_net_id, a CAP_NET_ADMIN caller can deterministically trigger the type confusion by adding/removing a NAT chain; no race, memory-layout gamble, or victim interaction is required.\nPR:L - nfnetlink_rcv requires CAP_NET_ADMIN via netlink_net_capable(); on systems with user namespaces this capability is available to an unprivileged local user (e.g. unshare -Urn), not only init-namespace root.\nUI:N - Exploitation is performed entirely by the attacker configuring nftables NAT chains over netlink; no action by another user or administrator is required beyond the attacker\u2019s own netfilter setup.\nS:U - Impact is kernel memory corruption and privilege escalation within the same host/kernel security domain; it does not cross a VM, container-to-host, or IOMMU boundary by itself.\nC:H - Stale nat_net_id makes net_generic() return a synproxy_net (24 bytes) misinterpreted as nat_net (176 bytes), causing slab out-of-bounds reads; KASAN confirmed an 8-byte OOB read and type confusion can expose adjacent per-net/kernel heap data.\nI:H - nf_nat_register_fn()/unregister_fn() write nat_hook_ops pointers, user counters, and hook entry tables through the mis-typed smaller structure, corrupting adjacent per-net memory and enabling further arbitrary write/control-flow hijack primitives.\nA:H - The mis-typed per-net access triggers KASAN slab-out-of-bounds faults and can kernel oops/panic during NAT hook registration; corrupted synproxy/per-net state can also crash or hang the system on subsequent netfilter activity."
    }
  }
}