{"id":"CVE-2026-31509","summary":"nfc: nci: fix circular locking dependency in nci_close_device","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: nci: fix circular locking dependency in nci_close_device\n\nnci_close_device() flushes rx_wq and tx_wq while holding req_lock.\nThis causes a circular locking dependency because nci_rx_work()\nrunning on rx_wq can end up taking req_lock too:\n\n  nci_rx_work -\u003e nci_rx_data_packet -\u003e nci_data_exchange_complete\n    -\u003e __sk_destruct -\u003e rawsock_destruct -\u003e nfc_deactivate_target\n    -\u003e nci_deactivate_target -\u003e nci_request -\u003e mutex_lock(&ndev-\u003ereq_lock)\n\nMove the flush of rx_wq after req_lock has been released.\nThis should safe (I think) because NCI_UP has already been cleared\nand the transport is closed, so the work will see it and return\n-ENETDOWN.\n\nNIPA has been hitting this running the nci selftest with a debug\nkernel on roughly 4% of the runs.","modified":"2026-05-28T03:55:17.207828988Z","published":"2026-04-22T13:54:27.436Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31509.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/09143c0e8f3b03517e6233aad42f45c794d8df8e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1edc12d2bbcb7a8d0f1088e6fccb9d8c01bb1289"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4527025d440ce84bf56e75ce1df2e84cb8178616"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5eef9ebec7f5738f12cadede3545c05b34bf5ac3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7ed00a3edc8597fe2333f524401e2889aa1b5edf"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ca54e904a071aa65ef3ad46ba42d51aaac6b73b4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d89b74bf08f067b55c03d7f999ba0a0e73177eb3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/eb435d150ca74b4d40f77f1a2266f3636ed64a79"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31509.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31509"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6a2968aaf50c7a22fced77a5e24aa636281efca8"},{"fixed":"7ed00a3edc8597fe2333f524401e2889aa1b5edf"},{"fixed":"5eef9ebec7f5738f12cadede3545c05b34bf5ac3"},{"fixed":"ca54e904a071aa65ef3ad46ba42d51aaac6b73b4"},{"fixed":"eb435d150ca74b4d40f77f1a2266f3636ed64a79"},{"fixed":"1edc12d2bbcb7a8d0f1088e6fccb9d8c01bb1289"},{"fixed":"d89b74bf08f067b55c03d7f999ba0a0e73177eb3"},{"fixed":"09143c0e8f3b03517e6233aad42f45c794d8df8e"},{"fixed":"4527025d440ce84bf56e75ce1df2e84cb8178616"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-31509.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.2.0"},{"fixed":"5.10.253"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.203"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.168"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.131"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.80"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.21"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.11"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-31509.json"}}],"schema_version":"1.7.5"}