CVE-2026-31509
nfc: nci: fix circular locking dependency in nci_close_device
Reported by linux · Published April 22, 2026
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.
EPSS 0.10% · 0.6th percentile
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| Linux | Linux | eb435d150ca74b4d40f77f1a2266f3636ed64a79, d89b74bf08f067b55c03d7f999ba0a0e73177eb3, ca54e904a071aa65ef3ad46ba42d51aaac6b73b4, 7ed00a3edc8597fe2333f524401e2889aa1b5edf, 5eef9ebec7f5738f12cadede3545c05b34bf5ac3, 4527025d440ce84bf56e75ce1df2e84cb8178616, 3.2, 1edc12d2bbcb7a8d0f1088e6fccb9d8c01bb1289, 09143c0e8f3b03517e6233aad42f45c794d8df8e |
Risk scores
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | 6a2968aaf50c7a22fced77a5e24aa636281efca8, 6a2968aaf50c7a22fced77a5e24aa636281efca8, 6a2968aaf50c7a22fced77a5e24aa636281efca8 |
| Linux | Linux | 3.2, 0, 5.10.253 |
| Linux | Linux | 6.19.11, 5.15.203, 6.6.131 |
| linux | linux_kernel | 3.2, 3.2, 3.2 |
Timeline
- Apr 22, 2026 CVE Published
- Apr 23, 2026 Security Advisory (97 in total, the first dated here)
- May 11, 2026 CVE Updated
- May 18, 2026 EPSS Score (20 in total, the first dated here)
- Jul 16, 2026 Coalition ESS Score
- Aug 11, 2026 Distribution Patch (92 in total, the first dated here)
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