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.
CVSS Details
- CVSS 3.1 Base Score: 7.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linuxUpgrade linux-6.12 | Sep 30, 2026 | Sep 17, 2026 |
| Ubuntu | — | Upgrade linux-azure-fdeUpgrade linux-aws-fipsUpgrade linux-lowlatencyUpgrade linux-kvmUpgrade linux-bluefieldUpgrade linux-intel-iotg-5.15Upgrade linux-nvidiaUpgrade linux-riscv-7.0Upgrade linux-realtimeUpgrade linux-oracleUpgrade linux-oem-7.0Upgrade linux-gcp-5.15Upgrade linux-hwe-5.15Upgrade linux-lowlatency-hwe-5.15Upgrade linux-ibmUpgrade linux-riscvUpgrade linux-azure-5.15Upgrade linux-aws-5.15Upgrade linux-azureUpgrade linux-gcpUpgrade linux-hwe-7.0Upgrade linuxUpgrade linux-gkeopUpgrade linux-awsUpgrade linux-gcp-fipsUpgrade linux-fipsUpgrade linux-gkeUpgrade linux-ibm-5.15Upgrade linux-oracle-5.15Upgrade linux-nvidia-tegra-igxUpgrade linux-azure-fipsUpgrade linux-intel-iot-realtimeUpgrade linux-azure-fde-5.15Upgrade linux-nvidia-tegraUpgrade linux-riscv-5.15Upgrade linux-intel-iotgUpgrade linux-nvidia-tegra-5.15 | Nov 3, 2026 | Sep 17, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Sep 30, 2026 | Sep 17, 2026 |
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