CVE-2026-43441 (GCVE-0-2026-43441)
Vulnerability from cvelistv5
Published
2026-05-08 14:22
Modified
2026-10-19 19:26
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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    "cveId": "CVE-2026-43441",
    "datePublished": "2026-05-08T14:22:09.982Z",
    "dateReserved": "2026-05-01T14:12:56.009Z",
    "dateUpdated": "2026-10-19T19:26:36.805Z",
    "state": "PUBLISHED"
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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.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4e24be018eb9dbcefa4b01c07e298b147dc1a4d7\", \"lessThan\": \"49dbfcb70eca5f6f9043594e1e323c74c39e3863\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4e24be018eb9dbcefa4b01c07e298b147dc1a4d7\", \"lessThan\": \"cf6099ef493b94e140b0fad52482a78853115318\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4e24be018eb9dbcefa4b01c07e298b147dc1a4d7\", \"lessThan\": \"c78f01abe535853f13f0b26cd5b1d2f19bf52e2f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4e24be018eb9dbcefa4b01c07e298b147dc1a4d7\", \"lessThan\": \"95faa1459b83fa544191e82ccc73856f03b7741f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4e24be018eb9dbcefa4b01c07e298b147dc1a4d7\", \"lessThan\": \"c9c238066fb254dabf65e27379f93c56112c5b96\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4e24be018eb9dbcefa4b01c07e298b147dc1a4d7\", \"lessThan\": \"30021e969d48e5819d5ae56936c2f34c0f7ce997\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/net/bonding/bond_main.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.18\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.18\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.1.167\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.130\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.78\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.19\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"6.19.9\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.19.*\"}, {\"status\": \"unaffected\", \"version\": \"7.0\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/net/bonding/bond_main.c\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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().\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.167\", \"versionStartIncluding\": \"5.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.130\", \"versionStartIncluding\": \"5.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.78\", \"versionStartIncluding\": \"5.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.19\", \"versionStartIncluding\": \"5.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.19.9\", \"versionStartIncluding\": \"5.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.0\", \"versionStartIncluding\": \"5.18\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:27:57.945Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-43441\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T19:26:36.805Z\", \"dateReserved\": \"2026-05-01T14:12:56.009Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-05-08T14:22:09.982Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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