{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-43441",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-43441"
  ],
  "published": "2026-05-08T14:22:57Z",
  "summary": "net: bonding: Fix nd_tbl NULL dereference when IPv6 is disabled",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bonding: Fix nd_tbl NULL dereference when IPv6 is disabled\n\nWhen booting with the 'ipv6.disable=1' parameter, the nd_tbl is never\ninitialized because inet6_init() exits before ndisc_init() is called\nwhich initializes it. If bonding ARP/NS validation is enabled, an IPv6\nNS/NA packet received on a slave can reach bond_validate_na(), which\ncalls bond_has_this_ip6(). That path calls ipv6_chk_addr() and can\ncrash in __ipv6_chk_addr_and_flags().\n\n BUG: kernel NULL pointer dereference, address: 00000000000005d8\n Oops: Oops: 0000 [#1] SMP NOPTI\n RIP: 0010:__ipv6_chk_addr_and_flags+0x69/0x170\n Call Trace:\n  <IRQ>\n  ipv6_chk_addr+0x1f/0x30\n  bond_validate_na+0x12e/0x1d0 [bonding]\n  ? __pfx_bond_handle_frame+0x10/0x10 [bonding]\n  bond_rcv_validate+0x1a0/0x450 [bonding]\n  bond_handle_frame+0x5e/0x290 [bonding]\n  ? srso_alias_return_thunk+0x5/0xfbef5\n  __netif_receive_skb_core.constprop.0+0x3e8/0xe50\n  ? srso_alias_return_thunk+0x5/0xfbef5\n  ? update_cfs_rq_load_avg+0x1a/0x240\n  ? srso_alias_return_thunk+0x5/0xfbef5\n  ? __enqueue_entity+0x5e/0x240\n  __netif_receive_skb_one_core+0x39/0xa0\n  process_backlog+0x9c/0x150\n  __napi_poll+0x30/0x200\n  ? srso_alias_return_thunk+0x5/0xfbef5\n  net_rx_action+0x338/0x3b0\n  handle_softirqs+0xc9/0x2a0\n  do_softirq+0x42/0x60\n  </IRQ>\n  <TASK>\n  __local_bh_enable_ip+0x62/0x70\n  __dev_queue_xmit+0x2d3/0x1000\n  ? srso_alias_return_thunk+0x5/0xfbef5\n  ? srso_alias_return_thunk+0x5/0xfbef5\n  ? packet_parse_headers+0x10a/0x1a0\n  packet_sendmsg+0x10da/0x1700\n  ? kick_pool+0x5f/0x140\n  ? srso_alias_return_thunk+0x5/0xfbef5\n  ? __queue_work+0x12d/0x4f0\n  __sys_sendto+0x1f3/0x220\n  __x64_sys_sendto+0x24/0x30\n  do_syscall_64+0x101/0xf80\n  ? exc_page_fault+0x6e/0x170\n  ? srso_alias_return_thunk+0x5/0xfbef5\n  entry_SYSCALL_64_after_hwframe+0x77/0x7f\n  </TASK>\n\nFix this by checking ipv6_mod_enabled() before dispatching IPv6 packets to\nbond_na_rcv(). If IPv6 is disabled, return early from bond_rcv_validate()\nand avoid the path to ipv6_chk_addr().",
  "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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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-43441"
    },
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    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
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      "cvss_v3_score": 7.5,
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      "scenario": "AV:N - A crafted IPv6 ICMPv6 NS/NA packet received on a bonding slave reaches the vulnerable receive path through the kernel networking stack. No local execution on the target is required once the vulnerable bonding configuration is present.\nAC:L - The trigger is deterministic: with IPv6 boot-disabled and bonding ARP/NS validation enabled, a matching IPv6 NS/NA frame reaches the unchecked path. There is no race, heap grooming, or timing requirement.\nPR:N - The packet receive path has no authentication or target-side privilege check. Bond configuration requires administration, but an attacker sending the triggering network frame does not need credentials on the victim.\nUI:N - No victim user action is needed after the vulnerable system is configured and receiving traffic. The attacker only needs to send the crafted packet.\nS:U - The impact is within the same kernel/host security authority. This is not a VM escape, sandbox boundary crossing, or IOMMU/DMA boundary bypass.\nC:N - The bug is a NULL pointer dereference in the IPv6 address/neighbor initialization path. It does not expose kernel memory or provide a read primitive.\nI:N - The issue is a pure NULL dereference, not memory corruption or an arbitrary write. There is no evidence of data modification or control-flow hijack capability.\nA:H - The NULL dereference occurs in the receive softirq path and produces a kernel oops/panic-class crash. It can be retriggered by sending additional crafted packets to the vulnerable configuration."
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}