From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E503B3F0762 for ; Fri, 8 May 2026 14:25:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778250349; cv=none; b=JHFk1qr2ZEFmYN+EELhuKNYAIRdgWCugVV1HfqdCOawo7eHs1Lh1IshsrWGJ7yLSnRkqXxt3f66FFFolfVnhbdwmjqvtIIBIVgrxHt1d1BV72HbfhGJo52lihQsKFOo0Xux8DCS9OFelwgqeDTF+jotb2qmdG9JsX9L3AsoM9Kg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778250349; c=relaxed/simple; bh=5hgf+GA/dxS/XHKuqZwn8KZbbzlfPYyX/qRfEpZbI9Y=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=EhlELtRT7HYe/xqdJsAVv3rHDouvuUqvrihBoP5v+97RdJM9WW/X4hCxxjY2iPCcHXpP0HmyNRhmzcr41gwoRjQq5EfPhw3HKXQ5W6Ei3NxB+jD5EKhGfSRW0X7MJQD1CQXXwqS/TqpUjOYidf/T7nfWvbDU2JarK7DZpBtuos0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=ozegJmGr; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="ozegJmGr" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 77AABC2BCB0; Fri, 8 May 2026 14:25:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1778250348; bh=5hgf+GA/dxS/XHKuqZwn8KZbbzlfPYyX/qRfEpZbI9Y=; h=From:To:Cc:Subject:Date:Reply-To:From; b=ozegJmGrCJGvUOyNsVcbYWDVZ8G/Ly982zZFubjmrxlY70xXTAK1hyuQ+N1mr2j2p yJiIpmHdGDSJI6YJZj19uF0vgMMaQhL8C4qcw+u/Esvr0LrtrkPqP9zsckj78apczl 4HBteus9z+/l0YLTIa3zwXsqv7t6k6fpWupgecZI= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-43441: net: bonding: Fix nd_tbl NULL dereference when IPv6 is disabled Date: Fri, 8 May 2026 16:22:50 +0200 Message-ID: <2026050854-CVE-2026-43441-72a0@gregkh> X-Mailer: git-send-email 2.54.0 Reply-To: , Precedence: bulk X-Mailing-List: linux-cve-announce@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=4670; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=3FtQAxdoZw7bA6mCtIrjpLRYXZihq5Y4rBhCPrqSCkw=; b=owGbwMvMwCRo6H6F97bub03G02pJDJl/PzZNlVjI3dz+yb+w+j33zo1M+SFFC5a5KLm49ujsq N+9kYWzI5aFQZCJQVZMkeXLNp6j+ysOKXoZ2p6GmcPKBDKEgYtTACayWpphfqlTX91Vhrdyh75G ix64/rkk97pIC8NccYFr06ftmZm/1fFj1vlXZ83uLk4/DAA= X-Developer-Key: i=gregkh@linuxfoundation.org; a=openpgp; fpr=F4B60CC5BF78C2214A313DCB3147D40DDB2DFB29 Content-Transfer-Encoding: 8bit From: Greg Kroah-Hartman Description =========== 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: 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 __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 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(). The Linux kernel CVE team has assigned CVE-2026-43441 to this issue. Affected and fixed versions =========================== Issue introduced in 5.18 with commit 4e24be018eb9dbcefa4b01c07e298b147dc1a4d7 and fixed in 6.1.167 with commit 49dbfcb70eca5f6f9043594e1e323c74c39e3863 Issue introduced in 5.18 with commit 4e24be018eb9dbcefa4b01c07e298b147dc1a4d7 and fixed in 6.6.130 with commit cf6099ef493b94e140b0fad52482a78853115318 Issue introduced in 5.18 with commit 4e24be018eb9dbcefa4b01c07e298b147dc1a4d7 and fixed in 6.12.78 with commit c78f01abe535853f13f0b26cd5b1d2f19bf52e2f Issue introduced in 5.18 with commit 4e24be018eb9dbcefa4b01c07e298b147dc1a4d7 and fixed in 6.18.19 with commit 95faa1459b83fa544191e82ccc73856f03b7741f Issue introduced in 5.18 with commit 4e24be018eb9dbcefa4b01c07e298b147dc1a4d7 and fixed in 6.19.9 with commit c9c238066fb254dabf65e27379f93c56112c5b96 Issue introduced in 5.18 with commit 4e24be018eb9dbcefa4b01c07e298b147dc1a4d7 and fixed in 7.0 with commit 30021e969d48e5819d5ae56936c2f34c0f7ce997 Please see https://www.kernel.org for a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2026-43441 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: drivers/net/bonding/bond_main.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/49dbfcb70eca5f6f9043594e1e323c74c39e3863 https://git.kernel.org/stable/c/cf6099ef493b94e140b0fad52482a78853115318 https://git.kernel.org/stable/c/c78f01abe535853f13f0b26cd5b1d2f19bf52e2f https://git.kernel.org/stable/c/95faa1459b83fa544191e82ccc73856f03b7741f https://git.kernel.org/stable/c/c9c238066fb254dabf65e27379f93c56112c5b96 https://git.kernel.org/stable/c/30021e969d48e5819d5ae56936c2f34c0f7ce997