Vulnerability-Lookup

FKIE_CVE-2025-39925

Vulnerability from fkie_nvd - Published: 2025-10-01 08:15 - Updated: 2026-09-02 13:16

Severity

5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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: can: j1939: implement NETDEV_UNREGISTER notification handler syzbot is reporting unregister_netdevice: waiting for vcan0 to become free. Usage count = 2 problem, for j1939 protocol did not have NETDEV_UNREGISTER notification handler for undoing changes made by j1939_sk_bind(). Commit 25fe97cb7620 ("can: j1939: move j1939_priv_put() into sk_destruct callback") expects that a call to j1939_priv_put() can be unconditionally delayed until j1939_sk_sock_destruct() is called. But we need to call j1939_priv_put() against an extra ref held by j1939_sk_bind() call (as a part of undoing changes made by j1939_sk_bind()) as soon as NETDEV_UNREGISTER notification fires (i.e. before j1939_sk_sock_destruct() is called via j1939_sk_release()). Otherwise, the extra ref on "struct j1939_priv" held by j1939_sk_bind() call prevents "struct net_device" from dropping the usage count to 1; making it impossible for unregister_netdevice() to continue. [mkl: remove space in front of label]

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/2c88069fac2c792e228e6a4ae71c9b9b5b9a87a6
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/479d8a2aedcc1db16f14c1a8a9c74b5bdf18b9ac
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4e154cb5e7681c2910e2dfa09f05e3469e333745
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/76957b618ce729c3bd1e782fbc9d9991af653925
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/7fcbe5b2c6a4b5407bf2241fdb71e0a390f6ab9a	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/da9e8f429139928570407e8f90559b5d46c20262	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	6.17
linux	linux_kernel	6.17
linux	linux_kernel	6.17
linux	linux_kernel	6.17
linux	linux_kernel	6.17

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/can/j1939/j1939-priv.h",
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          ],
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          ],
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            {
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              "status": "unaffected",
              "version": "6.12.108",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.16.8",
              "versionType": "semver"
            },
            {
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              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
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    }
  ],
  "configurations": [
    {
      "nodes": [
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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: j1939: implement NETDEV_UNREGISTER notification handler\n\nsyzbot is reporting\n\n  unregister_netdevice: waiting for vcan0 to become free. Usage count = 2\n\nproblem, for j1939 protocol did not have NETDEV_UNREGISTER notification\nhandler for undoing changes made by j1939_sk_bind().\n\nCommit 25fe97cb7620 (\"can: j1939: move j1939_priv_put() into sk_destruct\ncallback\") expects that a call to j1939_priv_put() can be unconditionally\ndelayed until j1939_sk_sock_destruct() is called. But we need to call\nj1939_priv_put() against an extra ref held by j1939_sk_bind() call\n(as a part of undoing changes made by j1939_sk_bind()) as soon as\nNETDEV_UNREGISTER notification fires (i.e. before j1939_sk_sock_destruct()\nis called via j1939_sk_release()). Otherwise, the extra ref on \"struct\nj1939_priv\" held by j1939_sk_bind() call prevents \"struct net_device\" from\ndropping the usage count to 1; making it impossible for\nunregister_netdevice() to continue.\n\n[mkl: remove space in front of label]"
    }
  ],
  "id": "CVE-2025-39925",
  "lastModified": "2026-09-02T13:16:49.733",
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          "timestamp": "2026-01-14T17:39:05.628974Z",
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  "published": "2025-10-01T08:15:35.857",
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  "vulnStatus": "Modified",
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      "source": "nvd@nist.gov",
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  ]
}

CVE-2025-39925 (GCVE-0-2025-39925)

Vulnerability from cvelistv5 – Published: 2025-10-01 08:07 – Updated: 2026-09-02 12:49

Title

can: j1939: implement NETDEV_UNREGISTER notification handler

Summary

Severity

5.5 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-01-14 17:39 UTC

CWE

CWE-noinfo Not enough information

Assigner

Linux mitre root

References

6 references

URL	Tags
https://git.kernel.org/stable/c/479d8a2aedcc1db16…
https://git.kernel.org/stable/c/2c88069fac2c792e2…
https://git.kernel.org/stable/c/76957b618ce729c3b…
https://git.kernel.org/stable/c/4e154cb5e7681c291…
https://git.kernel.org/stable/c/da9e8f42913992857…
https://git.kernel.org/stable/c/7fcbe5b2c6a4b5407…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 9d71dd0c70099914fcd063135da3c580865e924c , < 479d8a2aedcc1db16f14c1a8a9c74b5bdf18b9ac (git) Affected: 9d71dd0c70099914fcd063135da3c580865e924c , < 2c88069fac2c792e228e6a4ae71c9b9b5b9a87a6 (git) Affected: 9d71dd0c70099914fcd063135da3c580865e924c , < 76957b618ce729c3bd1e782fbc9d9991af653925 (git) Affected: 9d71dd0c70099914fcd063135da3c580865e924c , < 4e154cb5e7681c2910e2dfa09f05e3469e333745 (git) Affected: 9d71dd0c70099914fcd063135da3c580865e924c , < da9e8f429139928570407e8f90559b5d46c20262 (git) Affected: 9d71dd0c70099914fcd063135da3c580865e924c , < 7fcbe5b2c6a4b5407bf2241fdb71e0a390f6ab9a (git)
Linux	Linux	Affected: 5.4 Unaffected: 0 , < 5.4 (semver) Unaffected: 5.15.220 , ≤ 5.15.* (semver) Unaffected: 6.1.187 , ≤ 6.1.* (semver) Unaffected: 6.6.156 , ≤ 6.6.* (semver) Unaffected: 6.12.108 , ≤ 6.12.* (semver) Unaffected: 6.16.8 , ≤ 6.16.* (semver) Unaffected: 6.17 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
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        "metrics": [
          {
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              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
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              "confidentialityImpact": "NONE",
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              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
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            }
          },
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            "other": {
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                "options": [
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                  },
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                    "Technical Impact": "partial"
                  }
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                "role": "CISA Coordinator",
                "timestamp": "2026-01-14T17:39:05.628974Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
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        "problemTypes": [
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                "description": "CWE-noinfo Not enough information",
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        ],
        "providerMetadata": {
          "dateUpdated": "2026-01-14T17:42:45.107Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: j1939: implement NETDEV_UNREGISTER notification handler\n\nsyzbot is reporting\n\n  unregister_netdevice: waiting for vcan0 to become free. Usage count = 2\n\nproblem, for j1939 protocol did not have NETDEV_UNREGISTER notification\nhandler for undoing changes made by j1939_sk_bind().\n\nCommit 25fe97cb7620 (\"can: j1939: move j1939_priv_put() into sk_destruct\ncallback\") expects that a call to j1939_priv_put() can be unconditionally\ndelayed until j1939_sk_sock_destruct() is called. But we need to call\nj1939_priv_put() against an extra ref held by j1939_sk_bind() call\n(as a part of undoing changes made by j1939_sk_bind()) as soon as\nNETDEV_UNREGISTER notification fires (i.e. before j1939_sk_sock_destruct()\nis called via j1939_sk_release()). Otherwise, the extra ref on \"struct\nj1939_priv\" held by j1939_sk_bind() call prevents \"struct net_device\" from\ndropping the usage count to 1; making it impossible for\nunregister_netdevice() to continue.\n\n[mkl: remove space in front of label]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-02T12:49:23.677Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/479d8a2aedcc1db16f14c1a8a9c74b5bdf18b9ac"
        },
        {
          "url": "https://git.kernel.org/stable/c/2c88069fac2c792e228e6a4ae71c9b9b5b9a87a6"
        },
        {
          "url": "https://git.kernel.org/stable/c/76957b618ce729c3bd1e782fbc9d9991af653925"
        },
        {
          "url": "https://git.kernel.org/stable/c/4e154cb5e7681c2910e2dfa09f05e3469e333745"
        },
        {
          "url": "https://git.kernel.org/stable/c/da9e8f429139928570407e8f90559b5d46c20262"
        },
        {
          "url": "https://git.kernel.org/stable/c/7fcbe5b2c6a4b5407bf2241fdb71e0a390f6ab9a"
        }
      ],
      "title": "can: j1939: implement NETDEV_UNREGISTER notification handler",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39925",
    "datePublished": "2025-10-01T08:07:13.123Z",
    "dateReserved": "2025-04-16T07:20:57.147Z",
    "dateUpdated": "2026-09-02T12:49:23.677Z",
    "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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

FKIE_CVE-2025-39925

CVE-2025-39925 (GCVE-0-2025-39925)

Tags

Sightings

Nomenclature