CVE-2026-31509

MediumCVSS 5.5/10Last modified Nov 11, 2026

Description

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.

Metrics

CVSS 3.1 5.5/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-667

Affected software

VendorProductVersions
LinuxLinux>= 6a2968aaf50c7a22fced77a5e24aa636281efca8, < 7ed00a3edc8597fe2333f524401e2889aa1b5edf; >= 6a2968aaf50c7a22fced77a5e24aa636281efca8, < 5eef9ebec7f5738f12cadede3545c05b34bf5ac3; >= 6a2968aaf50c7a22fced77a5e24aa636281efca8, < ca54e904a071aa65ef3ad46ba42d51aaac6b73b4; >= 6a2968aaf50c7a22fced77a5e24aa636281efca8, < eb435d150ca74b4d40f77f1a2266f3636ed64a79; >= 6a2968aaf50c7a22fced77a5e24aa636281efca8, < 1edc12d2bbcb7a8d0f1088e6fccb9d8c01bb1289; >= 6a2968aaf50c7a22fced77a5e24aa636281efca8, < d89b74bf08f067b55c03d7f999ba0a0e73177eb3; >= 6a2968aaf50c7a22fced77a5e24aa636281efca8, < 09143c0e8f3b03517e6233aad42f45c794d8df8e; >= 6a2968aaf50c7a22fced77a5e24aa636281efca8, < 4527025d440ce84bf56e75ce1df2e84cb8178616
LinuxLinux3.2

References

Timeline

Published
Apr 22, 2026
Last modified
Nov 11, 2026
NVD status
Analyzed

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CVE-2026-31509: Medium severity, CVSS 5.5 | Vulnix