{"id":58558,"date":"2026-05-30T08:02:41","date_gmt":"2026-05-30T08:02:41","guid":{"rendered":"https:\/\/zero.redgem.net\/?p=58558"},"modified":"2026-05-30T08:02:41","modified_gmt":"2026-05-30T08:02:41","slug":"bonding-alb-fix-uaf-in-rlbarprecv-during-bond-updown","status":"publish","type":"post","link":"https:\/\/zero.redgem.net\/?p=58558","title":{"rendered":"bonding: alb: fix UAF in rlb_arp_recv during bond up\/down_CVE-2026-45970"},"content":{"rendered":"

{“lastseen”:””,”description”:”In the Linux kernel, the following vulnerability has been resolved:\\n\\nbonding: alb: fix UAF in rlb_arp_recv during bond up\/down\\n\\nThe ALB RX path may access rx_hashtbl concurrently with bond\\nteardown. During rapid bond up\/down cycles, rlb_deinitialize()\\nfrees rx_hashtbl while RX handlers are still running, leading\\nto a null pointer dereference detected by KASAN.\\n\\nHowever, the root cause is that rlb_arp_recv() can still be accessed\\nafter setting recv_probe to NULL, which is actually a use-after-free\\n(UAF) issue. That is the reason for using the referenced commit in the\\nFixes tag.\\n\\n[ 214.174138] Oops: general protection fault, probably for non-canonical address 0xdffffc000000001d: 0000 [#1] SMP KASAN PTI\\n[ 214.186478] KASAN: null-ptr-deref in range [0x00000000000000e8-0x00000000000000ef]\\n[ 214.194933] CPU: 30 UID: 0 PID: 2375 Comm: ping Kdump: loaded Not tainted 6.19.0-rc8+ #2 PREEMPT(voluntary)\\n[ 214.205907] Hardware name: Dell Inc. PowerEdge R730\/0WCJNT, BIOS 2.14.0 01\/14\/2022\\n[ 214.214357] RIP: 0010:rlb_arp_recv+0x505\/0xab0 [bonding]\\n[ 214.220320] Code: 0f 85 2b 05 00 00 48 b8 00 00 00 00 00 fc ff df 40 0f b6 ed 48 c1 e5 06 49 03 ad 78 01 00 00 48 8d 7d 28 48 89 fa 48 c1 ea 03 \\u003c0f\\u003e b6\\n 04 02 84 c0 74 06 0f 8e 12 05 00 00 80 7d 28 00 0f 84 8c 00\\n[ 214.241280] RSP: 0018:ffffc900073d8870 EFLAGS: 00010206\\n[ 214.247116] RAX: dffffc0000000000 RBX: ffff888168556822 RCX: ffff88816855681e\\n[ 214.255082] RDX: 000000000000001d RSI: dffffc0000000000 RDI: 00000000000000e8\\n[ 214.263048] RBP: 00000000000000c0 R08: 0000000000000002 R09: ffffed11192021c8\\n[ 214.271013] R10: ffff8888c9010e43 R11: 0000000000000001 R12: 1ffff92000e7b119\\n[ 214.278978] R13: ffff8888c9010e00 R14: ffff888168556822 R15: ffff888168556810\\n[ 214.286943] FS: 00007f85d2d9cb80(0000) GS:ffff88886ccb3000(0000) knlGS:0000000000000000\\n[ 214.295966] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n[ 214.302380] CR2: 00007f0d047b5e34 CR3: 00000008a1c2e002 CR4: 00000000001726f0\\n[ 214.310347] Call Trace:\\n[ 214.313070] \\u003cIRQ\\u003e\\n[ 214.315318] ? __pfx_rlb_arp_recv+0x10\/0x10 [bonding]\\n[ 214.320975] bond_handle_frame+0x166\/0xb60 [bonding]\\n[ 214.326537] ? __pfx_bond_handle_frame+0x10\/0x10 [bonding]\\n[ 214.332680] __netif_receive_skb_core.constprop.0+0x576\/0x2710\\n[ 214.339199] ? __pfx_arp_process+0x10\/0x10\\n[ 214.343775] ? sched_balance_find_src_group+0x98\/0x630\\n[ 214.349513] ? __pfx___netif_receive_skb_core.constprop.0+0x10\/0x10\\n[ 214.356513] ? arp_rcv+0x307\/0x690\\n[ 214.360311] ? __pfx_arp_rcv+0x10\/0x10\\n[ 214.364499] ? __lock_acquire+0x58c\/0xbd0\\n[ 214.368975] __netif_receive_skb_one_core+0xae\/0x1b0\\n[ 214.374518] ? __pfx___netif_receive_skb_one_core+0x10\/0x10\\n[ 214.380743] ? lock_acquire+0x10b\/0x140\\n[ 214.385026] process_backlog+0x3f1\/0x13a0\\n[ 214.389502] ? process_backlog+0x3aa\/0x13a0\\n[ 214.394174] __napi_poll.constprop.0+0x9f\/0x370\\n[ 214.399233] net_rx_action+0x8c1\/0xe60\\n[ 214.403423] ? __pfx_net_rx_action+0x10\/0x10\\n[ 214.408193] ? lock_acquire.part.0+0xbd\/0x260\\n[ 214.413058] ? sched_clock_cpu+0x6c\/0x540\\n[ 214.417540] ? mark_held_locks+0x40\/0x70\\n[ 214.421920] handle_softirqs+0x1fd\/0x860\\n[ 214.426302] ? __pfx_handle_softirqs+0x10\/0x10\\n[ 214.431264] ? __neigh_event_send+0x2d6\/0xf50\\n[ 214.436131] do_softirq+0xb1\/0xf0\\n[ 214.439830] \\u003c\/IRQ\\u003e\\n\\nThe issue is reproducible by repeatedly running\\nip link set bond0 up\/down while receiving ARP messages, where\\nrlb_arp_recv() can race with rlb_deinitialize() and dereference\\na freed rx_hashtbl entry.\\n\\nFix this by setting recv_probe to NULL and then calling\\nsynchronize_net() to wait for any concurrent RX processing to finish.\\nThis ensures that no RX handler can access rx_hashtbl after it is freed\\nin bond_alb_deinitialize().”,”published”:”2026-05-27T12:18:29.878Z”,”modified”:”2026-05-30T10:46:19.250Z”,”type”:”cve”,”title”:”bonding: alb: fix UAF in rlb_arp_recv during bond up\/down”,”source”:”Linux”,”references”:”https:\/\/git.kernel.org\/stable\/c\/fd54ddc929be1d6c3b3b7b35d6d4642a5d9e803c\\nhttps:\/\/git.kernel.org\/stable\/c\/de7c097800f07f3c108185c7a38b53a530ba30ff\\nhttps:\/\/git.kernel.org\/stable\/c\/db5435b5342e3aaa4521d0f3ccfe94316b253ca1\\nhttps:\/\/git.kernel.org\/stable\/c\/f94a0de7b9f32745a14a1621c63087a092823587\\nhttps:\/\/git.kernel.org\/stable\/c\/c65cdf46ce340c9c00fbbaf84599d2daff43626e\\nhttps:\/\/git.kernel.org\/stable\/c\/fef13c403be3fb685cb06419e6b3623106aab5ba\\nhttps:\/\/git.kernel.org\/stable\/c\/d31065526f160ee0244a719230aa069daca2bf4d\\nhttps:\/\/git.kernel.org\/stable\/c\/e6834a4c474697df23ab9948fd3577b26bf48656″,”id”:”CVE-2026-45970″,”bulletinFamily”:””,”cwe”:null,”cvelist”:null,”sourceData”:”Linux Linux 3aba891dde3842d89ad022237b99c1ed308040b0\\nLinux Linux 3aba891dde3842d89ad022237b99c1ed308040b0\\nLinux Linux 3aba891dde3842d89ad022237b99c1ed308040b0\\nLinux Linux 3aba891dde3842d89ad022237b99c1ed308040b0\\nLinux Linux 3aba891dde3842d89ad022237b99c1ed308040b0\\nLinux Linux 3aba891dde3842d89ad022237b99c1ed308040b0\\nLinux Linux 3aba891dde3842d89ad022237b99c1ed308040b0\\nLinux Linux 3aba891dde3842d89ad022237b99c1ed308040b0\\nLinux Linux 3.0″,”sourceHref”:””,”cvss”:{“score”:7.8,”severity”:”HIGH”,”vector”:”CVSS:3.1\/AV:L\/AC:L\/PR:L\/UI:N\/S:U\/C:H\/I:H\/A:H”,”version”:”3.1″},”cvss2″:{},”cvss3″:{“version”:””,”vectorString”:””,”baseScore”:0,”baseSeverity”:””,”attackVector”:””,”attackComplexity”:””,”privilegesRequired”:””,”userInteraction”:””,”scope”:””,”confidentialityImpact”:””,”integrityImpact”:””,”availabilityImpact”:””,”cvssV3″:{“version”:””,”vectorString”:””,”baseScore”:0,”baseSeverity”:””,”attackVector”:””,”attackComplexity”:””,”privilegesRequired”:””,”userInteraction”:””,”scope”:””,”confidentialityImpact”:””,”integrityImpact”:””,”availabilityImpact”:””}},”href”:””,”category_name”:”CVE”,”post_link”:””,”product”:”Linux”,”version”:”3aba891dde3842d89ad022237b99c1ed308040b0″,”vendor”:”Linux”,”ai_description”:””,”ai_severity”:””,”ai_vendor”:””,”ai_product”:””,”ai_version”:””,”ai_score”:0}<\/p>\n","protected":false},"excerpt":{"rendered":"

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