Medium 5.5Published Apr 22, 2026

CVE-2026-31509nfc: nci: fix circular locking dependency in nci_close_device

Updated under an hour ago (Oct 28, 2026, 4:30 AM ET)

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Exploited in the last 30 days

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.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: May 11, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 6a2968aaf50c7a22fced77a5e24aa636281efca8 before 7ed00a3edc8597fe2333f524401e2889aa1b5edf; 6a2968aaf50c7a22fced77a5e24aa636281efca8 builds before 5eef9ebec7f5738f12cadede3545c05b34bf5ac3; from 6a2968aaf50c7a22fced77a5e24aa636281efca8 before ca54e904a071aa65ef3ad46ba42d51aaac6b73b4; from 6a2968aaf50c7a22fced77a5e24aa636281efca8 before eb435d150ca74b4d40f77f1a2266f3636ed64a79; 6a2968aaf50c7a22fced77a5e24aa636281efca8 builds before 1edc12d2bbcb7a8d0f1088e6fccb9d8c01bb1289; from 6a2968aaf50c7a22fced77a5e24aa636281efca8 before d89b74bf08f067b55c03d7f999ba0a0e73177eb3; from 6a2968aaf50c7a22fced77a5e24aa636281efca8 before 09143c0e8f3b03517e6233aad42f45c794d8df8e; from 6a2968aaf50c7a22fced77a5e24aa636281efca8 before 4527025d440ce84bf56e75ce1df2e84cb8178616	CNA record
linux linux_kernel linux:linux_kernel	from 3.2.1 before 5.10.253; from 5.11 before 5.15.203; from 5.16 before 6.1.168; from 6.2 before 6.6.131; from 6.7 before 6.12.80; from 6.13 before 6.18.21; from 6.19 before 6.19.11; 3.2; and 7 more ranges	NVD

References

References

https://git.kernel.org/stable/c/7ed00a3edc8597fe2333f524401e2889aa1b5edf	patch
https://git.kernel.org/stable/c/5eef9ebec7f5738f12cadede3545c05b34bf5ac3	patch
https://git.kernel.org/stable/c/ca54e904a071aa65ef3ad46ba42d51aaac6b73b4	patch
https://git.kernel.org/stable/c/eb435d150ca74b4d40f77f1a2266f3636ed64a79	patch
https://git.kernel.org/stable/c/1edc12d2bbcb7a8d0f1088e6fccb9d8c01bb1289	patch
https://git.kernel.org/stable/c/d89b74bf08f067b55c03d7f999ba0a0e73177eb3	patch
https://git.kernel.org/stable/c/09143c0e8f3b03517e6233aad42f45c794d8df8e	patch
https://git.kernel.org/stable/c/4527025d440ce84bf56e75ce1df2e84cb8178616	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.