{"id":"CVE-2026-31509","state":"PUBLISHED","title":"nfc: nci: fix circular locking dependency in nci_close_device","description":"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 -> nci_rx_data_packet -> nci_data_exchange_complete\n    -> __sk_destruct -> rawsock_destruct -> nfc_deactivate_target\n    -> nci_deactivate_target -> nci_request -> mutex_lock(&ndev->req_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.","publishedAt":"2026-04-22T13:54:27.436Z","updatedAt":"2026-05-11T22:10:10.109Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"6a2968aaf50c7a22fced77a5e24aa636281efca8","status":"affected","lessThan":"7ed00a3edc8597fe2333f524401e2889aa1b5edf","versionType":"git"},{"version":"6a2968aaf50c7a22fced77a5e24aa636281efca8","status":"affected","lessThan":"5eef9ebec7f5738f12cadede3545c05b34bf5ac3","versionType":"git"},{"version":"6a2968aaf50c7a22fced77a5e24aa636281efca8","status":"affected","lessThan":"ca54e904a071aa65ef3ad46ba42d51aaac6b73b4","versionType":"git"},{"version":"6a2968aaf50c7a22fced77a5e24aa636281efca8","status":"affected","lessThan":"eb435d150ca74b4d40f77f1a2266f3636ed64a79","versionType":"git"},{"version":"6a2968aaf50c7a22fced77a5e24aa636281efca8","status":"affected","lessThan":"1edc12d2bbcb7a8d0f1088e6fccb9d8c01bb1289","versionType":"git"},{"version":"6a2968aaf50c7a22fced77a5e24aa636281efca8","status":"affected","lessThan":"d89b74bf08f067b55c03d7f999ba0a0e73177eb3","versionType":"git"},{"version":"6a2968aaf50c7a22fced77a5e24aa636281efca8","status":"affected","lessThan":"09143c0e8f3b03517e6233aad42f45c794d8df8e","versionType":"git"},{"version":"6a2968aaf50c7a22fced77a5e24aa636281efca8","status":"affected","lessThan":"4527025d440ce84bf56e75ce1df2e84cb8178616","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/nfc/nci/core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.2","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.2","versionType":"semver"},{"version":"5.10.253","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.203","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.168","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.131","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.80","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.21","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.11","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/nfc/nci/core.c"]}],"references":["https://git.kernel.org/stable/c/7ed00a3edc8597fe2333f524401e2889aa1b5edf","https://git.kernel.org/stable/c/5eef9ebec7f5738f12cadede3545c05b34bf5ac3","https://git.kernel.org/stable/c/ca54e904a071aa65ef3ad46ba42d51aaac6b73b4","https://git.kernel.org/stable/c/eb435d150ca74b4d40f77f1a2266f3636ed64a79","https://git.kernel.org/stable/c/1edc12d2bbcb7a8d0f1088e6fccb9d8c01bb1289","https://git.kernel.org/stable/c/d89b74bf08f067b55c03d7f999ba0a0e73177eb3","https://git.kernel.org/stable/c/09143c0e8f3b03517e6233aad42f45c794d8df8e","https://git.kernel.org/stable/c/4527025d440ce84bf56e75ce1df2e84cb8178616"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:40.391Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/31xxx/CVE-2026-31509.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-31509","state":"PUBLISHED","datePublished":"2026-04-22T13:54:27.436Z","dateUpdated":"2026-05-11T22:10:10.109Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-03-09T15:48:24.106Z"},"containers":{"cna":{"title":"nfc: nci: fix circular locking dependency in nci_close_device","descriptions":[{"lang":"en","value":"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 -> nci_rx_data_packet -> nci_data_exchange_complete\n    -> __sk_destruct -> rawsock_destruct -> nfc_deactivate_target\n    -> nci_deactivate_target -> nci_request -> mutex_lock(&ndev->req_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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"6a2968aaf50c7a22fced77a5e24aa636281efca8","status":"affected","lessThan":"7ed00a3edc8597fe2333f524401e2889aa1b5edf","versionType":"git"},{"version":"6a2968aaf50c7a22fced77a5e24aa636281efca8","status":"affected","lessThan":"5eef9ebec7f5738f12cadede3545c05b34bf5ac3","versionType":"git"},{"version":"6a2968aaf50c7a22fced77a5e24aa636281efca8","status":"affected","lessThan":"ca54e904a071aa65ef3ad46ba42d51aaac6b73b4","versionType":"git"},{"version":"6a2968aaf50c7a22fced77a5e24aa636281efca8","status":"affected","lessThan":"eb435d150ca74b4d40f77f1a2266f3636ed64a79","versionType":"git"},{"version":"6a2968aaf50c7a22fced77a5e24aa636281efca8","status":"affected","lessThan":"1edc12d2bbcb7a8d0f1088e6fccb9d8c01bb1289","versionType":"git"},{"version":"6a2968aaf50c7a22fced77a5e24aa636281efca8","status":"affected","lessThan":"d89b74bf08f067b55c03d7f999ba0a0e73177eb3","versionType":"git"},{"version":"6a2968aaf50c7a22fced77a5e24aa636281efca8","status":"affected","lessThan":"09143c0e8f3b03517e6233aad42f45c794d8df8e","versionType":"git"},{"version":"6a2968aaf50c7a22fced77a5e24aa636281efca8","status":"affected","lessThan":"4527025d440ce84bf56e75ce1df2e84cb8178616","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/nfc/nci/core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.2","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.2","versionType":"semver"},{"version":"5.10.253","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.203","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.168","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.131","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.80","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.21","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.11","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/nfc/nci/core.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/7ed00a3edc8597fe2333f524401e2889aa1b5edf"},{"url":"https://git.kernel.org/stable/c/5eef9ebec7f5738f12cadede3545c05b34bf5ac3"},{"url":"https://git.kernel.org/stable/c/ca54e904a071aa65ef3ad46ba42d51aaac6b73b4"},{"url":"https://git.kernel.org/stable/c/eb435d150ca74b4d40f77f1a2266f3636ed64a79"},{"url":"https://git.kernel.org/stable/c/1edc12d2bbcb7a8d0f1088e6fccb9d8c01bb1289"},{"url":"https://git.kernel.org/stable/c/d89b74bf08f067b55c03d7f999ba0a0e73177eb3"},{"url":"https://git.kernel.org/stable/c/09143c0e8f3b03517e6233aad42f45c794d8df8e"},{"url":"https://git.kernel.org/stable/c/4527025d440ce84bf56e75ce1df2e84cb8178616"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T22:10:10.109Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.2","versionEndExcluding":"5.10.253"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.2","versionEndExcluding":"5.15.203"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.2","versionEndExcluding":"6.1.168"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.2","versionEndExcluding":"6.6.131"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.2","versionEndExcluding":"6.12.80"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.2","versionEndExcluding":"6.18.21"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.2","versionEndExcluding":"6.19.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.2","versionEndExcluding":"7.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}