{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-31509", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-03-09T15:48:24.106Z", "datePublished": "2026-04-22T13:54:27.436Z", "dateUpdated": "2026-05-11T22:10:10.109Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T22:10:10.109Z"}, "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 -> 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"https://git.kernel.org/stable/c/4527025d440ce84bf56e75ce1df2e84cb8178616"}], "title": "nfc: nci: fix circular locking dependency in nci_close_device", "x_generator": {"engine": "bippy-1.2.0"}}}}

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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."}], "id": "CVE-2026-31509", "lastModified": "2026-04-28T15:02:57.200", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": 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{"bugzilla": {"description": "kernel: nfc: nci: fix circular locking dependency in nci_close_device", "id": "2460679", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2460679"}, "csaw": false, "cwe": "CWE-833", "details": ["A flaw was found in the Linux kernel, specifically within the Near Field Communication (NFC) NCI subsystem. A circular locking dependency can occur when the `nci_close_device()` function attempts to flush work queues while holding a lock that can be re-acquired by a work queue function. This improper handling of locks can lead to a system hang, resulting in a denial of service (DoS)."], "name": "CVE-2026-31509", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-04-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31509\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31509\nhttps://lore.kernel.org/linux-cve-announce/2026042208-CVE-2026-31509-8609@gregkh/T"]}