{"id":"CVE-2026-45970","title":"bonding: alb: fix UAF in rlb_arp_recv during bond up/down","summary":"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_…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 3aba891dde3842d89ad022237b99c1ed308040b0 < fd54ddc929be1d6c3b3b7b35d6d4642a5d9e803c","Linux >= 3aba891dde3842d89ad022237b99c1ed308040b0 < de7c097800f07f3c108185c7a38b53a530ba30ff","Linux >= 3aba891dde3842d89ad022237b99c1ed308040b0 < db5435b5342e3aaa4521d0f3ccfe94316b253ca1","Linux >= 3aba891dde3842d89ad022237b99c1ed308040b0 < f94a0de7b9f32745a14a1621c63087a092823587","Linux >= 3aba891dde3842d89ad022237b99c1ed308040b0 < c65cdf46ce340c9c00fbbaf84599d2daff43626e","Linux >= 3aba891dde3842d89ad022237b99c1ed308040b0 < fef13c403be3fb685cb06419e6b3623106aab5ba","Linux >= 3aba891dde3842d89ad022237b99c1ed308040b0 < d31065526f160ee0244a719230aa069daca2bf4d","Linux >= 3aba891dde3842d89ad022237b99c1ed308040b0 < e6834a4c474697df23ab9948fd3577b26bf48656","Linux 3.0"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:18:40.906017Z"},"published":"2026-05-27","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:20:47.835Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-45970","references":[{"url":"https://git.kernel.org/stable/c/fd54ddc929be1d6c3b3b7b35d6d4642a5d9e803c"},{"url":"https://git.kernel.org/stable/c/de7c097800f07f3c108185c7a38b53a530ba30ff"},{"url":"https://git.kernel.org/stable/c/db5435b5342e3aaa4521d0f3ccfe94316b253ca1"},{"url":"https://git.kernel.org/stable/c/f94a0de7b9f32745a14a1621c63087a092823587"},{"url":"https://git.kernel.org/stable/c/c65cdf46ce340c9c00fbbaf84599d2daff43626e"},{"url":"https://git.kernel.org/stable/c/fef13c403be3fb685cb06419e6b3623106aab5ba"},{"url":"https://git.kernel.org/stable/c/d31065526f160ee0244a719230aa069daca2bf4d"},{"url":"https://git.kernel.org/stable/c/e6834a4c474697df23ab9948fd3577b26bf48656"}],"tags":["cve.org"],"epss":0.00126,"epssPercentile":0.02027,"ingestedAt":"2026-10-16T17:24:46.702Z","slug":"CVE-2026-45970","body":"## Overview\n\nIn 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 <0f> 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]  <IRQ>\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]  </IRQ>\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().\n\n## Affected\n\n- `Linux >= 3aba891dde3842d89ad022237b99c1ed308040b0 < fd54ddc929be1d6c3b3b7b35d6d4642a5d9e803c`\n- `Linux >= 3aba891dde3842d89ad022237b99c1ed308040b0 < de7c097800f07f3c108185c7a38b53a530ba30ff`\n- `Linux >= 3aba891dde3842d89ad022237b99c1ed308040b0 < db5435b5342e3aaa4521d0f3ccfe94316b253ca1`\n- `Linux >= 3aba891dde3842d89ad022237b99c1ed308040b0 < f94a0de7b9f32745a14a1621c63087a092823587`\n- `Linux >= 3aba891dde3842d89ad022237b99c1ed308040b0 < c65cdf46ce340c9c00fbbaf84599d2daff43626e`\n- `Linux >= 3aba891dde3842d89ad022237b99c1ed308040b0 < fef13c403be3fb685cb06419e6b3623106aab5ba`\n- `Linux >= 3aba891dde3842d89ad022237b99c1ed308040b0 < d31065526f160ee0244a719230aa069daca2bf4d`\n- `Linux >= 3aba891dde3842d89ad022237b99c1ed308040b0 < e6834a4c474697df23ab9948fd3577b26bf48656`\n- `Linux 3.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}