nfc: nci: fix circular locking dependency in nci_close_device
In the Linux kernel, the following vulnerability has been resolved: nfc: nci: fix circular locking dependency in nci_close_device nci_close_device() flushes rx_wq and tx_wq while holding req_lock. This causes a circular locking dependency because nci_rx_work() running on rx_wq can end up taking req_lock too: nci_rx_work -> nci_rx_data_packet -> nci_data_exchange_complete -> __sk_destruct -> rawsock_destruct -> nfc_deactivate_target -> nci_deactivate_target -> nci_request -> mutex_lock(&ndev->req_lock) Move the flush of rx_wq after req_lock has been released. This should safe (I think) because NCI_UP has already been cleared and the transport is closed, so the work will see it and return -ENETDOWN. NIPA has been hitting this running the nci selftest with a debug kernel on roughly 4% of the runs.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 5.10.253, 5.15.203, 6.1.168, 6.12.80, 6.18.21, 6.19.11, 6.6.131
- CVEs
- CVE-2026-31509
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 13:30 UTC · Revision 1
Source evidence
nfc: nci: fix circular locking dependency in nci_close_device
core-osv · Original sourcePublished 22 Apr 2026, 13:54 UTC
In the Linux kernel, the following vulnerability has been resolved: nfc: nci: fix circular locking dependency in nci_close_device nci_close_device() flushes rx_wq and tx_wq while holding req_lock. This causes a circular locking dependency because nci_rx_work() running on rx_wq can end up taking req_lock too: nci_rx_work -> nci_rx_data_packet -> nci_data_exchange_complete -> __sk_destruct -> rawsock_destruct -> nfc_deactivate_target -> nci_deactivate_target -> nci_request -> mutex_lock(&ndev->req_lock) Move the flush of rx_wq after req_lock has been released. This should safe (I think) because NCI_UP has already been cleared and the transport is closed, so the work will see it and return -ENETDOWN. NIPA has been hitting this running the nci selftest with a debug kernel on roughly 4% of the runs.
osv:CVE-2026-31509
Kernel
Fixed versions: 5.10.253, 5.15.203, 6.1.168, 6.6.131, 6.12.80, 6.18.21, 6.19.11
Complete source record
{
"id": "830f3ead5e1e0aae67ed1c95384eff2174b0af72912d729d611c9fbca744f780",
"url": "https://osv.dev/vulnerability/CVE-2026-31509",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "nfc: nci: fix circular locking dependency in nci_close_device",
"summary": "In the Linux kernel, the following vulnerability has been resolved: nfc: nci: fix circular locking dependency in nci_close_device nci_close_device() flushes rx_wq and tx_wq while holding req_lock. This causes a circular locking dependency because nci_rx_work() running on rx_wq can end up taking req_lock too: nci_rx_work -> nci_rx_data_packet -> nci_data_exchange_complete -> __sk_destruct -> rawsock_destruct -> nfc_deactivate_target -> nci_deactivate_target -> nci_request -> mutex_lock(&ndev->req_lock) Move the flush of rx_wq after req_lock has been released. This should safe (I think) because NCI_UP has already been cleared and the transport is closed, so the work will see it and return -ENETDOWN. NIPA has been hitting this running the nci selftest with a debug kernel on roughly 4% of the runs.",
"evidence": "osv:CVE-2026-31509",
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"modified": "2026-10-28T02:30:36.206726006Z",
"provider": "osv",
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"security_relevant": true,
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"source_id": "core-osv",
"document_id": 503144,
"published_at": "2026-04-22T13:54:27.436+00:00"
}