CVE-2026-43441 (GCVE-0-2026-43441)
Vulnerability from cvelistv5
Published
2026-05-08 14:22
Modified
2026-08-05 12:27
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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().
References
Impacted products
Vendor Product Version
Linux Linux Version: 4e24be018eb9dbcefa4b01c07e298b147dc1a4d7
Version: 4e24be018eb9dbcefa4b01c07e298b147dc1a4d7
Version: 4e24be018eb9dbcefa4b01c07e298b147dc1a4d7
Version: 4e24be018eb9dbcefa4b01c07e298b147dc1a4d7
Version: 4e24be018eb9dbcefa4b01c07e298b147dc1a4d7
Version: 4e24be018eb9dbcefa4b01c07e298b147dc1a4d7
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/bonding/bond_main.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/bonding/bond_main.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.18"
            },
            {
              "lessThan": "5.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.167",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.130",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.78",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.19",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.167",
                  "versionStartIncluding": "5.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.130",
                  "versionStartIncluding": "5.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionEndExcluding": "7.0",
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:27:57.945Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/49dbfcb70eca5f6f9043594e1e323c74c39e3863"
        },
        {
          "url": "https://git.kernel.org/stable/c/cf6099ef493b94e140b0fad52482a78853115318"
        },
        {
          "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"
      }
    }
  },
  "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": "2026-08-05T12:27:57.945Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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