{"id":"CVE-2026-53184","revision":"00b997601c234c408a451332ef910d27","records":[{"revision":"00b997601c234c408a451332ef910d27","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-53184","aliases":[],"title":"udp: clear skb->dev before running a sockmap verdict","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nudp: clear skb->dev before running a sockmap verdict\n\nOn the UDP receive path skb->dev 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() -> 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->dev)\n\t\tcaller_net = dev_net(skb->dev);\n\nskb->dev 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 \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 \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->dev so bpf_skc_lookup() falls back to sock_net(skb->sk), which\nskb_set_owner_sk_safe() set just above.","state":0,"publishedAt":"2026-06-25T08:38:58.189+00:00","modifiedAt":"2026-10-19T19:57:26.714+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/ipv4/udp.c\"\n ],\n \"versions\": [\n {\n \"version\": \"965b57b469a589d64d81b1688b38dcb537011bb0\",\n \"lessThan\": \"263779a6beff03b8b06f6d25566cb0f45af361f2\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"965b57b469a589d64d81b1688b38dcb537011bb0\",\n \"lessThan\": \"1b585673a2249f13678e7ac443ac683ba767e0b6\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"965b57b469a589d64d81b1688b38dcb537011bb0\",\n \"lessThan\": \"90d35188aaa92b8f8b23f66335e0e91bf60103a3\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"965b57b469a589d64d81b1688b38dcb537011bb0\",\n \"lessThan\": \"6822eed69572000a181fa4e31fceacc60918c471\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"965b57b469a589d64d81b1688b38dcb537011bb0\",\n \"lessThan\": \"7d6d92d000ebe3a845a17c165c1d3a70c5d84fe1\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"965b57b469a589d64d81b1688b38dcb537011bb0\",\n \"lessThan\": \"3c94f241f776562c489876ff506f366224565c21\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/ipv4/udp.c\"\n ],\n \"versions\": [\n {\n \"version\": \"6.0\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"6.0\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.176\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.143\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.94\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.36\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.0.13\",\n \"lessThanOrEqual\": \"7.0.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/263779a6beff03b8b06f6d25566cb0f45af361f2","https://git.kernel.org/stable/c/1b585673a2249f13678e7ac443ac683ba767e0b6","https://git.kernel.org/stable/c/90d35188aaa92b8f8b23f66335e0e91bf60103a3","https://git.kernel.org/stable/c/6822eed69572000a181fa4e31fceacc60918c471","https://git.kernel.org/stable/c/7d6d92d000ebe3a845a17c165c1d3a70c5d84fe1","https://git.kernel.org/stable/c/3c94f241f776562c489876ff506f366224565c21"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-53184","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-53184","identifiers":["CVE-2026-53184"]},"retained":false,"historicalAffected":[]}],"coverage":[]}