net: bonding: Fix nd_tbl NULL dereference when IPv6 is disabled_CVE-2026-43441

{
    "lastseen": "",
    "description": "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().",
    "published": "2026-05-08T14:22:09.982Z",
    "modified": "2026-05-11T06:34:32.163Z",
    "type": "cve",
    "title": "net: bonding: Fix nd_tbl NULL dereference when IPv6 is disabled",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/49dbfcb70eca5f6f9043594e1e323c74c39e3863\nhttps://git.kernel.org/stable/c/cf6099ef493b94e140b0fad52482a78853115318\nhttps://git.kernel.org/stable/c/c78f01abe535853f13f0b26cd5b1d2f19bf52e2f\nhttps://git.kernel.org/stable/c/95faa1459b83fa544191e82ccc73856f03b7741f\nhttps://git.kernel.org/stable/c/c9c238066fb254dabf65e27379f93c56112c5b96\nhttps://git.kernel.org/stable/c/30021e969d48e5819d5ae56936c2f34c0f7ce997",
    "id": "CVE-2026-43441",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux 4e24be018eb9dbcefa4b01c07e298b147dc1a4d7\nLinux Linux 4e24be018eb9dbcefa4b01c07e298b147dc1a4d7\nLinux Linux 4e24be018eb9dbcefa4b01c07e298b147dc1a4d7\nLinux Linux 4e24be018eb9dbcefa4b01c07e298b147dc1a4d7\nLinux Linux 4e24be018eb9dbcefa4b01c07e298b147dc1a4d7\nLinux Linux 4e24be018eb9dbcefa4b01c07e298b147dc1a4d7\nLinux Linux 5.18",
    "sourceHref": "",
    "cvss": {
        "score": 7.5,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
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        "baseScore": 0,
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        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "4e24be018eb9dbcefa4b01c07e298b147dc1a4d7",
    "vendor": "Linux",
    "ai_description": "",
    "ai_severity": "",
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    "ai_score": 0
}