High 7.5Published May 8, 2026

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

Updated under an hour ago (2026-10-19 10:20 UTC)

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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().

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: Oct 16, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 4e24be018eb9dbcefa4b01c07e298b147dc1a4d7 before 49dbfcb70eca5f6f9043594e1e323c74c39e3863; from 4e24be018eb9dbcefa4b01c07e298b147dc1a4d7 before cf6099ef493b94e140b0fad52482a78853115318; from 4e24be018eb9dbcefa4b01c07e298b147dc1a4d7 before c78f01abe535853f13f0b26cd5b1d2f19bf52e2f; from 4e24be018eb9dbcefa4b01c07e298b147dc1a4d7 before 95faa1459b83fa544191e82ccc73856f03b7741f; from 4e24be018eb9dbcefa4b01c07e298b147dc1a4d7 before c9c238066fb254dabf65e27379f93c56112c5b96; from 4e24be018eb9dbcefa4b01c07e298b147dc1a4d7 before 30021e969d48e5819d5ae56936c2f34c0f7ce997	CNA record
linux linux_kernel linux:linux_kernel	from 5.18 before 6.1.167; from 6.2 before 6.6.130; from 6.7 before 6.12.78; from 6.13 before 6.18.19; from 6.19 before 6.19.9; 7.0; 7.0; 7.0	NVD

References

https://git.kernel.org/stable/c/49dbfcb70eca5f6f9043594e1e323c74c39e3863patch
https://git.kernel.org/stable/c/cf6099ef493b94e140b0fad52482a78853115318patch
https://git.kernel.org/stable/c/c78f01abe535853f13f0b26cd5b1d2f19bf52e2fpatch
https://git.kernel.org/stable/c/95faa1459b83fa544191e82ccc73856f03b7741fpatch
https://git.kernel.org/stable/c/c9c238066fb254dabf65e27379f93c56112c5b96patch
https://git.kernel.org/stable/c/30021e969d48e5819d5ae56936c2f34c0f7ce997patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.