CVE-2026-31509 (GCVE-0-2026-31509)
Vulnerability from cvelistv5
Published
2026-04-22 13:54
Modified
2026-04-22 13:54
Severity ?
VLAI Severity ?
EPSS score ?
Summary
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 6a2968aaf50c7a22fced77a5e24aa636281efca8 Version: 6a2968aaf50c7a22fced77a5e24aa636281efca8 Version: 6a2968aaf50c7a22fced77a5e24aa636281efca8 Version: 6a2968aaf50c7a22fced77a5e24aa636281efca8 Version: 6a2968aaf50c7a22fced77a5e24aa636281efca8 Version: 6a2968aaf50c7a22fced77a5e24aa636281efca8 Version: 6a2968aaf50c7a22fced77a5e24aa636281efca8 Version: 6a2968aaf50c7a22fced77a5e24aa636281efca8 |
||
{
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],
"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 -\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(\u0026ndev-\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."
}
],
"providerMetadata": {
"dateUpdated": "2026-04-22T13:54:27.436Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/7ed00a3edc8597fe2333f524401e2889aa1b5edf"
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{
"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"
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{
"url": "https://git.kernel.org/stable/c/d89b74bf08f067b55c03d7f999ba0a0e73177eb3"
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{
"url": "https://git.kernel.org/stable/c/09143c0e8f3b03517e6233aad42f45c794d8df8e"
},
{
"url": "https://git.kernel.org/stable/c/4527025d440ce84bf56e75ce1df2e84cb8178616"
}
],
"title": "nfc: nci: fix circular locking dependency in nci_close_device",
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"cveMetadata": {
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"assignerShortName": "Linux",
"cveId": "CVE-2026-31509",
"datePublished": "2026-04-22T13:54:27.436Z",
"dateReserved": "2026-03-09T15:48:24.106Z",
"dateUpdated": "2026-04-22T13:54:27.436Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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