CVE-2026-31509
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.
Does this matter?
Lower severity and a low EPSS score (0.10%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.10% probability · 1th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-667
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/09143c0e8f3b03517e6233aad42f45c794d8df8ePatch
- https://git.kernel.org/stable/c/1edc12d2bbcb7a8d0f1088e6fccb9d8c01bb1289Patch
- https://git.kernel.org/stable/c/4527025d440ce84bf56e75ce1df2e84cb8178616Patch
- https://git.kernel.org/stable/c/5eef9ebec7f5738f12cadede3545c05b34bf5ac3Patch
- https://git.kernel.org/stable/c/7ed00a3edc8597fe2333f524401e2889aa1b5edfPatch
- https://git.kernel.org/stable/c/ca54e904a071aa65ef3ad46ba42d51aaac6b73b4Patch
- https://git.kernel.org/stable/c/d89b74bf08f067b55c03d7f999ba0a0e73177eb3Patch
- https://git.kernel.org/stable/c/eb435d150ca74b4d40f77f1a2266f3636ed64a79Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.