GHSA-W59P-46MP-6WPV
Vulnerability from github – Published: 2026-06-25 09:31 – Updated: 2026-06-28 09:31In the Linux kernel, the following vulnerability has been resolved:
udp: clear skb->dev before running a sockmap verdict
On the UDP receive path skb->dev is repurposed as dev_scratch (the truesize/state cache set by udp_set_dev_scratch()), through the union { struct net_device *dev; unsigned long dev_scratch; } in sk_buff.
When a UDP socket is in a sockmap, sk_data_ready is sk_psock_verdict_data_ready(), which calls udp_read_skb() -> recv_actor() (sk_psock_verdict_recv) to run the attached SK_SKB verdict program in softirq. If that program calls a socket-lookup helper (bpf_sk_lookup_tcp/udp, bpf_skc_lookup_tcp), bpf_skc_lookup() does:
if (skb->dev)
caller_net = dev_net(skb->dev);
skb->dev still holds the dev_scratch value (a non-NULL integer), so dev_net() dereferences it as a struct net_device * and the kernel takes a general protection fault on a non-canonical address in softirq:
Oops: general protection fault, probably for non-canonical address 0x1010000800004a0 CPU: 1 UID: 0 PID: 1406 Comm: syz.2.19 Not tainted 7.1.0-rc6 #1 PREEMPT(full) RIP: 0010:bpf_skc_lookup net/core/filter.c:7033 [inline] RIP: 0010:bpf_sk_lookup+0x45/0x160 net/core/filter.c:7047 Call Trace: bpf_prog_4675cb904b7071f8+0x12e/0x14e bpf_prog_run_pin_on_cpu+0xc6/0x1f0 sk_psock_verdict_recv+0x1ba/0x350 udp_read_skb+0x31a/0x370 sk_psock_verdict_data_ready+0x2e3/0x600 __udp_enqueue_schedule_skb+0x4c8/0x650 udpv6_queue_rcv_one_skb+0x3ec/0x740 udp6_unicast_rcv_skb+0x11d/0x140 ip6_protocol_deliver_rcu+0x61e/0x950 ip6_input_finish+0xa9/0x150 NF_HOOK+0x286/0x2f0 ip6_input+0x117/0x220 NF_HOOK+0x286/0x2f0 __netif_receive_skb+0x85/0x200 process_backlog+0x374/0x9a0 __napi_poll+0x4f/0x1c0 net_rx_action+0x3b0/0x770 handle_softirqs+0x15a/0x460 do_softirq+0x57/0x80
The rmem charge that dev_scratch accounted for is released by skb_recv_udp() on dequeue, just above, so the scratch is dead by the time recv_actor() runs. Clear skb->dev so bpf_skc_lookup() falls back to sock_net(skb->sk), which skb_set_owner_sk_safe() set just above.
{
"affected": [],
"aliases": [
"CVE-2026-53184"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-06-25T09:16:35Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nudp: clear skb-\u003edev before running a sockmap verdict\n\nOn the UDP receive path skb-\u003edev is repurposed as dev_scratch (the\ntruesize/state cache set by udp_set_dev_scratch()), through the\nunion { struct net_device *dev; unsigned long dev_scratch; } in sk_buff.\n\nWhen a UDP socket is in a sockmap, sk_data_ready is\nsk_psock_verdict_data_ready(), which calls udp_read_skb() -\u003e recv_actor()\n(sk_psock_verdict_recv) to run the attached SK_SKB verdict program in softirq.\nIf that program calls a socket-lookup helper (bpf_sk_lookup_tcp/udp,\nbpf_skc_lookup_tcp), bpf_skc_lookup() does:\n\n\tif (skb-\u003edev)\n\t\tcaller_net = dev_net(skb-\u003edev);\n\nskb-\u003edev still holds the dev_scratch value (a non-NULL integer), so dev_net()\ndereferences it as a struct net_device * and the kernel takes a general\nprotection fault on a non-canonical address in softirq:\n\n Oops: general protection fault, probably for non-canonical address 0x1010000800004a0\n CPU: 1 UID: 0 PID: 1406 Comm: syz.2.19 Not tainted 7.1.0-rc6 #1 PREEMPT(full)\n RIP: 0010:bpf_skc_lookup net/core/filter.c:7033 [inline]\n RIP: 0010:bpf_sk_lookup+0x45/0x160 net/core/filter.c:7047\n Call Trace:\n \u003cIRQ\u003e\n bpf_prog_4675cb904b7071f8+0x12e/0x14e\n bpf_prog_run_pin_on_cpu+0xc6/0x1f0\n sk_psock_verdict_recv+0x1ba/0x350\n udp_read_skb+0x31a/0x370\n sk_psock_verdict_data_ready+0x2e3/0x600\n __udp_enqueue_schedule_skb+0x4c8/0x650\n udpv6_queue_rcv_one_skb+0x3ec/0x740\n udp6_unicast_rcv_skb+0x11d/0x140\n ip6_protocol_deliver_rcu+0x61e/0x950\n ip6_input_finish+0xa9/0x150\n NF_HOOK+0x286/0x2f0\n ip6_input+0x117/0x220\n NF_HOOK+0x286/0x2f0\n __netif_receive_skb+0x85/0x200\n process_backlog+0x374/0x9a0\n __napi_poll+0x4f/0x1c0\n net_rx_action+0x3b0/0x770\n handle_softirqs+0x15a/0x460\n do_softirq+0x57/0x80\n \u003c/IRQ\u003e\n\nThe rmem charge that dev_scratch accounted for is released by skb_recv_udp() on\ndequeue, just above, so the scratch is dead by the time recv_actor() runs. Clear\nskb-\u003edev so bpf_skc_lookup() falls back to sock_net(skb-\u003esk), which\nskb_set_owner_sk_safe() set just above.",
"id": "GHSA-w59p-46mp-6wpv",
"modified": "2026-06-28T09:31:43Z",
"published": "2026-06-25T09:31:20Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53184"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1b585673a2249f13678e7ac443ac683ba767e0b6"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/263779a6beff03b8b06f6d25566cb0f45af361f2"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3c94f241f776562c489876ff506f366224565c21"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6822eed69572000a181fa4e31fceacc60918c471"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/7d6d92d000ebe3a845a17c165c1d3a70c5d84fe1"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/90d35188aaa92b8f8b23f66335e0e91bf60103a3"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
Sightings
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