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CVE-2026-31509— nfc: nci: fix circular locking dependency in nci_close_device

AI Predicted 3.3 Difficulty: Moderate EPSS 0.01% · P2

Possible ATT&CK Techniques 1AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 18

VendorProductVersion RangeStatus
LinuxLinux6a2968aaf50c7a22fced77a5e24aa636281efca8< 7ed00a3edc8597fe2333f524401e2889aa1b5edfaffected
6a2968aaf50c7a22fced77a5e24aa636281efca8< 5eef9ebec7f5738f12cadede3545c05b34bf5ac3affected
6a2968aaf50c7a22fced77a5e24aa636281efca8< ca54e904a071aa65ef3ad46ba42d51aaac6b73b4affected
6a2968aaf50c7a22fced77a5e24aa636281efca8< eb435d150ca74b4d40f77f1a2266f3636ed64a79affected
6a2968aaf50c7a22fced77a5e24aa636281efca8< 1edc12d2bbcb7a8d0f1088e6fccb9d8c01bb1289affected
6a2968aaf50c7a22fced77a5e24aa636281efca8< d89b74bf08f067b55c03d7f999ba0a0e73177eb3affected
6a2968aaf50c7a22fced77a5e24aa636281efca8< 09143c0e8f3b03517e6233aad42f45c794d8df8eaffected
6a2968aaf50c7a22fced77a5e24aa636281efca8< 4527025d440ce84bf56e75ce1df2e84cb8178616affected
… +10 more rows
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I. Basic Information for CVE-2026-31509

Vulnerability Information
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Vulnerability Title
nfc: nci: fix circular locking dependency in nci_close_device
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于nci_close_device中req_lock与工作队列的循环锁定依赖，可能导致死锁。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux 6a2968aaf50c7a22fced77a5e24aa636281efca8 ~ 7ed00a3edc8597fe2333f524401e2889aa1b5edf -
LinuxLinux 3.2 -

II. Public POCs for CVE-2026-31509

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III. Intelligence Information for CVE-2026-31509

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Same Patch Batch · Linux · 2026-04-22 · 100 CVEs total

CVE-2026-314639.8 CRITICALiomap: fix invalid folio access when i_blkbits differs from I/O granularity
CVE-2026-314449.8 CRITICALksmbd: fix use-after-free and NULL deref in smb_grant_oplock()
CVE-2026-315019.8 CRITICALnet: ti: icssg-prueth: fix use-after-free of CPPI descriptor in RX path
CVE-2026-314369.8 CRITICALdmaengine: idxd: fix possible wrong descriptor completion in llist_abort_desc()
CVE-2026-314789.8 CRITICALksmbd: replace hardcoded hdr2_len with offsetof() in smb2_calc_max_out_buf_len()
CVE-2026-314489.4 CRITICALext4: avoid infinite loops caused by residual data
CVE-2026-314328.8 HIGHksmbd: fix OOB write in QUERY_INFO for compound requests
CVE-2026-314338.8 HIGHksmbd: fix potencial OOB in get_file_all_info() for compound requests
CVE-2026-314508.8 HIGHext4: publish jinode after initialization
CVE-2026-314358.8 HIGHnetfs: Fix read abandonment during retry
CVE-2026-314768.2 HIGHksmbd: do not expire session on binding failure
CVE-2026-314648.1 HIGHscsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done()
CVE-2026-315138.1 HIGHBluetooth: L2CAP: Fix stack-out-of-bounds read in l2cap_ecred_conn_req
CVE-2026-314467.8 HIGHext4: fix use-after-free in update_super_work when racing with umount
CVE-2026-314497.8 HIGHext4: validate p_idx bounds in ext4_ext_correct_indexes
CVE-2026-315027.8 HIGHteam: fix header_ops type confusion with non-Ethernet ports
CVE-2026-314317.8 HIGHcrypto: algif_aead - Revert to operating out-of-place
CVE-2026-314887.8 HIGHdrm/amd/display: Do not skip unrelated mode changes in DSC validation
CVE-2026-314907.8 HIGHdrm/xe/pf: Fix use-after-free in migration restore
CVE-2026-314547.8 HIGHxfs: save ailp before dropping the AIL lock in push callbacks

Showing top 20 of 100 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-31509

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