CVE-2026-53184 (GCVE-0-2026-53184)
Vulnerability from cvelistv5
Published
2026-06-25 08:38
Modified
2026-10-19 19:57
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
In 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: <IRQ> 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 </IRQ> 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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 965b57b469a589d64d81b1688b38dcb537011bb0
Version: 965b57b469a589d64d81b1688b38dcb537011bb0
Version: 965b57b469a589d64d81b1688b38dcb537011bb0
Version: 965b57b469a589d64d81b1688b38dcb537011bb0
Version: 965b57b469a589d64d81b1688b38dcb537011bb0
Version: 965b57b469a589d64d81b1688b38dcb537011bb0
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          "value": "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."
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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\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"965b57b469a589d64d81b1688b38dcb537011bb0\", \"lessThan\": \"263779a6beff03b8b06f6d25566cb0f45af361f2\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"965b57b469a589d64d81b1688b38dcb537011bb0\", \"lessThan\": \"1b585673a2249f13678e7ac443ac683ba767e0b6\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"965b57b469a589d64d81b1688b38dcb537011bb0\", \"lessThan\": \"90d35188aaa92b8f8b23f66335e0e91bf60103a3\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"965b57b469a589d64d81b1688b38dcb537011bb0\", \"lessThan\": \"6822eed69572000a181fa4e31fceacc60918c471\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"965b57b469a589d64d81b1688b38dcb537011bb0\", \"lessThan\": \"7d6d92d000ebe3a845a17c165c1d3a70c5d84fe1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"965b57b469a589d64d81b1688b38dcb537011bb0\", \"lessThan\": \"3c94f241f776562c489876ff506f366224565c21\", \"versionType\": \"git\"}], \"programFiles\": [\"net/ipv4/udp.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.0\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.0\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.1.176\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.143\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.94\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.36\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.0.13\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.0.*\"}, {\"status\": \"unaffected\", \"version\": \"7.1\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/ipv4/udp.c\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.176\", \"versionStartIncluding\": \"6.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.143\", \"versionStartIncluding\": \"6.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.94\", \"versionStartIncluding\": \"6.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.36\", \"versionStartIncluding\": \"6.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.0.13\", \"versionStartIncluding\": \"6.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1\", \"versionStartIncluding\": \"6.0\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:33:51.091Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-53184\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T19:57:26.714Z\", \"dateReserved\": \"2026-06-09T07:44:35.390Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-06-25T08:38:58.189Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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