Vulnerability-Lookup

FKIE_CVE-2026-31509

Vulnerability from fkie_nvd - Published: 2026-04-22 14:16 - Updated: 2026-04-28 15:02

Severity ?

5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/09143c0e8f3b03517e6233aad42f45c794d8df8e	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/1edc12d2bbcb7a8d0f1088e6fccb9d8c01bb1289	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4527025d440ce84bf56e75ce1df2e84cb8178616	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5eef9ebec7f5738f12cadede3545c05b34bf5ac3	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/7ed00a3edc8597fe2333f524401e2889aa1b5edf	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ca54e904a071aa65ef3ad46ba42d51aaac6b73b4	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/d89b74bf08f067b55c03d7f999ba0a0e73177eb3	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/eb435d150ca74b4d40f77f1a2266f3636ed64a79	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	3.2
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0

JSON

To clipboard

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      "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."
    }
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  "id": "CVE-2026-31509",
  "lastModified": "2026-04-28T15:02:57.200",
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          "baseScore": 5.5,
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          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
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}

CVE-2026-31509 (GCVE-0-2026-31509)

Vulnerability from cvelistv5 – Published: 2026-04-22 13:54 – Updated: 2026-04-22 13:54

Title

nfc: nci: fix circular locking dependency in nci_close_device

Summary

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/7ed00a3edc8597fe2…
	https://git.kernel.org/stable/c/5eef9ebec7f5738f1…
	https://git.kernel.org/stable/c/ca54e904a071aa65e…
	https://git.kernel.org/stable/c/eb435d150ca74b4d4…
	https://git.kernel.org/stable/c/1edc12d2bbcb7a8d0…
	https://git.kernel.org/stable/c/d89b74bf08f067b55…
	https://git.kernel.org/stable/c/09143c0e8f3b03517…
	https://git.kernel.org/stable/c/4527025d440ce84bf…

Impacted products

Vendor

Product

Version

Linux

Affected: 6a2968aaf50c7a22fced77a5e24aa636281efca8 , < 7ed00a3edc8597fe2333f524401e2889aa1b5edf (git)
Affected: 6a2968aaf50c7a22fced77a5e24aa636281efca8 , < 5eef9ebec7f5738f12cadede3545c05b34bf5ac3 (git)
Affected: 6a2968aaf50c7a22fced77a5e24aa636281efca8 , < ca54e904a071aa65ef3ad46ba42d51aaac6b73b4 (git)
Affected: 6a2968aaf50c7a22fced77a5e24aa636281efca8 , < eb435d150ca74b4d40f77f1a2266f3636ed64a79 (git)
Affected: 6a2968aaf50c7a22fced77a5e24aa636281efca8 , < 1edc12d2bbcb7a8d0f1088e6fccb9d8c01bb1289 (git)
Affected: 6a2968aaf50c7a22fced77a5e24aa636281efca8 , < d89b74bf08f067b55c03d7f999ba0a0e73177eb3 (git)
Affected: 6a2968aaf50c7a22fced77a5e24aa636281efca8 , < 09143c0e8f3b03517e6233aad42f45c794d8df8e (git)
Affected: 6a2968aaf50c7a22fced77a5e24aa636281efca8 , < 4527025d440ce84bf56e75ce1df2e84cb8178616 (git)

Linux

Affected: 3.2
Unaffected: 0 , < 3.2 (semver)
Unaffected: 5.10.253 , ≤ 5.10.* (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.168 , ≤ 6.1.* (semver)
Unaffected: 6.6.131 , ≤ 6.6.* (semver)
Unaffected: 6.12.80 , ≤ 6.12.* (semver)
Unaffected: 6.18.21 , ≤ 6.18.* (semver)
Unaffected: 6.19.11 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/nfc/nci/core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.19.11",
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              "status": "unaffected",
              "version": "7.0",
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          "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"
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        },
        {
          "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"
        }
      ],
      "title": "nfc: nci: fix circular locking dependency in nci_close_device",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "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"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

FKIE_CVE-2026-31509

CVE-2026-31509 (GCVE-0-2026-31509)

Tags

Sightings

Nomenclature