CVE-2026-90224 (GCVE-0-2026-90224)
Vulnerability from cvelistv5
Published
2026-09-17 16:07
Modified
2026-10-19 09:00
Severity ?
7.5 (High) - CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: nfc: nci: fix double completion race in nci_data_exchange_complete nci_close_device() and nci_rx_work can both call nci_data_exchange_complete() concurrently. After commit 4527025d440ce8 ("nfc: nci: fix circular locking dependency in nci_close_device") moved flush_workqueue(ndev->rx_wq) after mutex_unlock(&ndev->req_lock), rx_work is no longer serialized with the explicit completion call in the close path. Both callers read the non-NULL callback pointer and invoke rawsock_data_exchange_complete(), which calls sock_put() -- but only one sock_hold() was taken, so the second sock_put() underflows the refcount and frees the socket while it is still in use. Replace the bare clear_bit(NCI_DATA_EXCHANGE) with test_and_clear_bit() so that only the first caller proceeds to invoke the callback.
References
Impacted products
Vendor Product Version
Linux Linux Version: 7ed00a3edc8597fe2333f524401e2889aa1b5edf
Version: 5eef9ebec7f5738f12cadede3545c05b34bf5ac3
Version: ca54e904a071aa65ef3ad46ba42d51aaac6b73b4
Version: eb435d150ca74b4d40f77f1a2266f3636ed64a79
Version: 1edc12d2bbcb7a8d0f1088e6fccb9d8c01bb1289
Version: d89b74bf08f067b55c03d7f999ba0a0e73177eb3
Version: 4527025d440ce84bf56e75ce1df2e84cb8178616
Version: 4527025d440ce84bf56e75ce1df2e84cb8178616
Version: 09143c0e8f3b03517e6233aad42f45c794d8df8e
Version: 5.10.253   ≤
Version: 5.15.203   ≤
Version: 6.1.168   ≤
Version: 6.6.131   ≤
Version: 6.12.80   ≤
Version: 6.18.21   ≤
Version: 6.19.11   ≤
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: nci: fix double completion race in nci_data_exchange_complete\n\nnci_close_device() and nci_rx_work can both call\nnci_data_exchange_complete() concurrently.  After commit 4527025d440ce8\n(\"nfc: nci: fix circular locking dependency in nci_close_device\") moved\nflush_workqueue(ndev-\u003erx_wq) after mutex_unlock(\u0026ndev-\u003ereq_lock),\nrx_work is no longer serialized with the explicit completion call in the\nclose path.  Both callers read the non-NULL callback pointer and invoke\nrawsock_data_exchange_complete(), which calls sock_put() -- but only one\nsock_hold() was taken, so the second sock_put() underflows the refcount\nand frees the socket while it is still in use.\n\nReplace the bare clear_bit(NCI_DATA_EXCHANGE) with\ntest_and_clear_bit() so that only the first caller proceeds to invoke\nthe callback."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - One completion is nci_rx_work() handling an NCI_MT_DATA_PKT (nci_rx_data_packet()\u2192nci_add_rx_data_frag()\u2192nci_data_exchange_complete()), with that skb queued by nci_recv_frame() from the NFC controller as NFC RF traffic; NFC radio range is Adjacent, not a routable IP transport.\nAC:H - The bug is nci_close_device() and nci_rx_work() both invoking nci_data_exchange_complete() after flush_workqueue(ndev-\u003erx_wq) moved past mutex_unlock(\u0026ndev-\u003ereq_lock). An NFC peer can drive rx_work but cannot start that close: nfc_dev_down() returns -EBUSY while active_target is set, and nci_unregister_device() is driver teardown the peer cannot initiate.\nPR:N - nci_recv_frame()\u2192nci_rx_work() processes NCI frames with no capability or authentication check, so an in-range NFC peer needs no host account. GENL_ADMIN_PERM on nfc_genl_dev_down()/NFC_CMD_DEV_DOWN is only the victim-side close gate, not a privilege the adjacent attacker must hold.\nUI:N - With NFC already up and nci_transceive() having set NCI_DATA_EXCHANGE (normal for a polling reader or in-progress tag session), the peer\u0027s DATA packet completes via nci_rx_work with no further click, mount, or prompt; concurrent nci_close_device() is an AC condition, not a required victim action.\nS:U - The extra sock_put() in rawsock_data_exchange_complete() frees a host kernel struct sock; impact stays in the same kernel authority with no VM escape, IOMMU bypass, or sandbox crossing.\nC:H - nci_close_device() and nci_rx_work() both read conn_info-\u003edata_exchange_cb and call rawsock_data_exchange_complete(), which sock_put()s the sk held once by sock_hold() in rawsock_tx_work(); the second put underflows that refcount and frees the socket while still referenced, a UAF read primitive.\nI:H - The same double sock_put() of the PF_NFC SOCK_SEQPACKET socket is a kernel UAF on struct sock, and the second callback runs against that freed object, giving a heap write/control-flow hijack primitive.\nA:H - Refcount underflow and the second rawsock_data_exchange_complete() on the already-freed sk (or __sk_destruct racing the second put, the path that also hit nci_close_device lockdep) cause a kernel oops or panic."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:00:00.751Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3f075832734005310740d148d1cf1c1e792ebdca"
        },
        {
          "url": "https://git.kernel.org/stable/c/588ccd19a6e69eca72d54608c3ab3b45709b2305"
        },
        {
          "url": "https://git.kernel.org/stable/c/cf646a9f5554bc07d6ccb59c327812b3a0c6a368"
        },
        {
          "url": "https://git.kernel.org/stable/c/9030a1bbe2c6b1e3e54cef462d159b5248f09fd2"
        },
        {
          "url": "https://git.kernel.org/stable/c/bfdf412208fea7fc0d5b32d68a35b25261917393"
        },
        {
          "url": "https://git.kernel.org/stable/c/ba4c776af3dc21ed04e315e6545e99703bb1b53a"
        },
        {
          "url": "https://git.kernel.org/stable/c/ee08414d78b851e3d1856d6e4d631939b01a1bbe"
        },
        {
          "url": "https://git.kernel.org/stable/c/8265a626cc14a48e46e6dc8c47667e72b4232ac2"
        }
      ],
      "title": "nfc: nci: fix double completion race in nci_data_exchange_complete",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90224",
    "datePublished": "2026-09-17T16:07:34.009Z",
    "dateReserved": "2026-09-11T19:38:34.794Z",
    "dateUpdated": "2026-10-19T09:00:00.751Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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