CVE-2026-43441 (GCVE-0-2026-43441)

Vulnerability from cvelistv5 – Published: 2026-05-08 14:22 – Updated: 2026-05-08 14:22
VLAI?
Title
net: bonding: Fix nd_tbl NULL dereference when IPv6 is disabled
Summary
In the Linux kernel, the following vulnerability has been resolved: net: bonding: Fix nd_tbl NULL dereference when IPv6 is disabled When booting with the 'ipv6.disable=1' parameter, the nd_tbl is never initialized because inet6_init() exits before ndisc_init() is called which initializes it. If bonding ARP/NS validation is enabled, an IPv6 NS/NA packet received on a slave can reach bond_validate_na(), which calls bond_has_this_ip6(). That path calls ipv6_chk_addr() and can crash in __ipv6_chk_addr_and_flags(). BUG: kernel NULL pointer dereference, address: 00000000000005d8 Oops: Oops: 0000 [#1] SMP NOPTI RIP: 0010:__ipv6_chk_addr_and_flags+0x69/0x170 Call Trace: <IRQ> ipv6_chk_addr+0x1f/0x30 bond_validate_na+0x12e/0x1d0 [bonding] ? __pfx_bond_handle_frame+0x10/0x10 [bonding] bond_rcv_validate+0x1a0/0x450 [bonding] bond_handle_frame+0x5e/0x290 [bonding] ? srso_alias_return_thunk+0x5/0xfbef5 __netif_receive_skb_core.constprop.0+0x3e8/0xe50 ? srso_alias_return_thunk+0x5/0xfbef5 ? update_cfs_rq_load_avg+0x1a/0x240 ? srso_alias_return_thunk+0x5/0xfbef5 ? __enqueue_entity+0x5e/0x240 __netif_receive_skb_one_core+0x39/0xa0 process_backlog+0x9c/0x150 __napi_poll+0x30/0x200 ? srso_alias_return_thunk+0x5/0xfbef5 net_rx_action+0x338/0x3b0 handle_softirqs+0xc9/0x2a0 do_softirq+0x42/0x60 </IRQ> <TASK> __local_bh_enable_ip+0x62/0x70 __dev_queue_xmit+0x2d3/0x1000 ? srso_alias_return_thunk+0x5/0xfbef5 ? srso_alias_return_thunk+0x5/0xfbef5 ? packet_parse_headers+0x10a/0x1a0 packet_sendmsg+0x10da/0x1700 ? kick_pool+0x5f/0x140 ? srso_alias_return_thunk+0x5/0xfbef5 ? __queue_work+0x12d/0x4f0 __sys_sendto+0x1f3/0x220 __x64_sys_sendto+0x24/0x30 do_syscall_64+0x101/0xf80 ? exc_page_fault+0x6e/0x170 ? srso_alias_return_thunk+0x5/0xfbef5 entry_SYSCALL_64_after_hwframe+0x77/0x7f </TASK> Fix this by checking ipv6_mod_enabled() before dispatching IPv6 packets to bond_na_rcv(). If IPv6 is disabled, return early from bond_rcv_validate() and avoid the path to ipv6_chk_addr().
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 4e24be018eb9dbcefa4b01c07e298b147dc1a4d7 , < 49dbfcb70eca5f6f9043594e1e323c74c39e3863 (git)
Affected: 4e24be018eb9dbcefa4b01c07e298b147dc1a4d7 , < cf6099ef493b94e140b0fad52482a78853115318 (git)
Affected: 4e24be018eb9dbcefa4b01c07e298b147dc1a4d7 , < c78f01abe535853f13f0b26cd5b1d2f19bf52e2f (git)
Affected: 4e24be018eb9dbcefa4b01c07e298b147dc1a4d7 , < 95faa1459b83fa544191e82ccc73856f03b7741f (git)
Affected: 4e24be018eb9dbcefa4b01c07e298b147dc1a4d7 , < c9c238066fb254dabf65e27379f93c56112c5b96 (git)
Affected: 4e24be018eb9dbcefa4b01c07e298b147dc1a4d7 , < 30021e969d48e5819d5ae56936c2f34c0f7ce997 (git)
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    Linux Linux Affected: 5.18
Unaffected: 0 , < 5.18 (semver)
Unaffected: 6.1.167 , ≤ 6.1.* (semver)
Unaffected: 6.6.130 , ≤ 6.6.* (semver)
Unaffected: 6.12.78 , ≤ 6.12.* (semver)
Unaffected: 6.18.19 , ≤ 6.18.* (semver)
Unaffected: 6.19.9 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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      "affected": [
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          "product": "Linux",
          "programFiles": [
            "drivers/net/bonding/bond_main.c"
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              "status": "unaffected",
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              "status": "unaffected",
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      "descriptions": [
        {
          "lang": "en",
          "value": "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 \u0027ipv6.disable=1\u0027 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  \u003cIRQ\u003e\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  \u003c/IRQ\u003e\n  \u003cTASK\u003e\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  \u003c/TASK\u003e\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()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-08T14:22:09.982Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/49dbfcb70eca5f6f9043594e1e323c74c39e3863"
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        },
        {
          "url": "https://git.kernel.org/stable/c/c78f01abe535853f13f0b26cd5b1d2f19bf52e2f"
        },
        {
          "url": "https://git.kernel.org/stable/c/95faa1459b83fa544191e82ccc73856f03b7741f"
        },
        {
          "url": "https://git.kernel.org/stable/c/c9c238066fb254dabf65e27379f93c56112c5b96"
        },
        {
          "url": "https://git.kernel.org/stable/c/30021e969d48e5819d5ae56936c2f34c0f7ce997"
        }
      ],
      "title": "net: bonding: Fix nd_tbl NULL dereference when IPv6 is disabled",
      "x_generator": {
        "engine": "bippy-1.2.0"
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    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43441",
    "datePublished": "2026-05-08T14:22:09.982Z",
    "dateReserved": "2026-05-01T14:12:56.009Z",
    "dateUpdated": "2026-05-08T14:22:09.982Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-43441\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-05-08T15:16:56.523\",\"lastModified\":\"2026-05-08T15:16:56.523\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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 \u0027ipv6.disable=1\u0027 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  \u003cIRQ\u003e\\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  \u003c/IRQ\u003e\\n  \u003cTASK\u003e\\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  \u003c/TASK\u003e\\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().\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/30021e969d48e5819d5ae56936c2f34c0f7ce997\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/49dbfcb70eca5f6f9043594e1e323c74c39e3863\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/95faa1459b83fa544191e82ccc73856f03b7741f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c78f01abe535853f13f0b26cd5b1d2f19bf52e2f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c9c238066fb254dabf65e27379f93c56112c5b96\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cf6099ef493b94e140b0fad52482a78853115318\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
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Detection rules are retrieved from Rulezet.