{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-53184", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.390Z", "datePublished": "2026-06-25T08:38:58.189Z", "dateUpdated": "2026-08-05T12:33:51.091Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:33:51.091Z" }, "descriptions": [ { "lang": "en", "value": "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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - The vulnerable code is reached on the IPv4/IPv6 UDP receive path when a packet is delivered to a UDP socket using sockmap verdict handling. In a reasonable deployment where such a socket is exposed by a service, a remote sender can trigger the path with UDP traffic.\nAC:L - There is no race or timing requirement; once the UDP socket has a SK_SKB sockmap verdict program that calls a socket-lookup helper, a received UDP packet reliably drives the stale skb->dev dereference. The required sockmap/verdict configuration is a deployment condition, not an attacker-controlled race.\nPR:N - A network attacker sending to an already configured UDP sockmap endpoint needs no local account or authentication. Creating the sockmap/BPF setup locally is privilege-gated by CAP_NET_ADMIN/CAP_BPF, but that is not required for the remote trigger scenario.\nUI:N - No victim user action is required after the affected service/socket is present. Packet receipt alone invokes the data-ready callback and verdict program.\nS:U - The impact remains within the kernel/network stack security authority. There is no VM escape, sandbox boundary crossing, or separate security scope involved.\nC:N - The bug misinterprets UDP dev_scratch metadata as a struct net_device pointer and faults during dev_net()/ifindex access. I found no usable information disclosure or attacker-controlled read primitive.\nI:N - The investigated path is an invalid pointer dereference, not a use-after-free or out-of-bounds write. I found no attacker-controlled write, data modification, or control-flow hijack primitive.\nA:H - The documented failure is a kernel general protection fault/oops in softirq. It is repeatable with UDP packets against the affected sockmap verdict configuration, causing high availability impact." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ipv4/udp.c" ], "versions": [ { "version": "965b57b469a589d64d81b1688b38dcb537011bb0", "lessThan": "263779a6beff03b8b06f6d25566cb0f45af361f2", "status": "affected", "versionType": "git" }, { "version": "965b57b469a589d64d81b1688b38dcb537011bb0", "lessThan": "1b585673a2249f13678e7ac443ac683ba767e0b6", "status": "affected", "versionType": "git" }, { "version": "965b57b469a589d64d81b1688b38dcb537011bb0", "lessThan": "90d35188aaa92b8f8b23f66335e0e91bf60103a3", "status": "affected", "versionType": "git" }, { "version": "965b57b469a589d64d81b1688b38dcb537011bb0", "lessThan": "6822eed69572000a181fa4e31fceacc60918c471", "status": "affected", "versionType": "git" }, { "version": "965b57b469a589d64d81b1688b38dcb537011bb0", "lessThan": "7d6d92d000ebe3a845a17c165c1d3a70c5d84fe1", "status": "affected", "versionType": "git" }, { "version": "965b57b469a589d64d81b1688b38dcb537011bb0", "lessThan": "3c94f241f776562c489876ff506f366224565c21", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ipv4/udp.c" ], "versions": [ { "version": "6.0", "status": "affected" }, { "version": "0", "lessThan": "6.0", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.176", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.143", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.94", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.36", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.13", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.1.176" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.6.143" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.12.94" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.18.36" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "7.0.13" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/263779a6beff03b8b06f6d25566cb0f45af361f2" }, { "url": "https://git.kernel.org/stable/c/1b585673a2249f13678e7ac443ac683ba767e0b6" }, { "url": "https://git.kernel.org/stable/c/90d35188aaa92b8f8b23f66335e0e91bf60103a3" }, { "url": "https://git.kernel.org/stable/c/6822eed69572000a181fa4e31fceacc60918c471" }, { "url": "https://git.kernel.org/stable/c/7d6d92d000ebe3a845a17c165c1d3a70c5d84fe1" }, { "url": "https://git.kernel.org/stable/c/3c94f241f776562c489876ff506f366224565c21" } ], "title": "udp: clear skb->dev before running a sockmap verdict", "x_generator": { "engine": "bippy-1.2.0" } } } }