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

Vulnerability from cvelistv5 – Published: 2025-10-01 08:07 – Updated: 2026-09-02 12:49
VLAI
Title
can: j1939: implement NETDEV_UNREGISTER notification handler
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]
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
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7061 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
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)
guessed Create a notification for this product.
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)
guessed Create a notification for this product.
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                  },
                  {
                    "automatable": "no"
                  },
                  {
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                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-01-14T17:39:05.628974Z",
                "version": "2.0.3"
              }
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          ]
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        "published": "2025-10-01T08:15:35.857",
        "references": [
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
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    },
    "redhat_vex": {
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      "current_release_date": "2026-06-30T01:24:58+00:00",
      "cve": "CVE-2025-39925",
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      "product_status:fixed": "1775",
      "product_status:known_affected": "22",
      "product_status:known_not_affected": "183",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: can: j1939: implement NETDEV_UNREGISTER notification handler",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-39925.json",
      "version": "3"
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                  "availabilityImpact": "HIGH",
                  "baseScore": 5.5,
                  "baseSeverity": "MEDIUM",
                  "confidentialityImpact": "NONE",
                  "integrityImpact": "NONE",
                  "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",
                  "version": "3.1"
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              {
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                    "id": "CVE-2025-39925",
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                    "description": "CWE-noinfo Not enough information",
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                    "type": "CWE"
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                ]
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            ],
            "providerMetadata": {
              "dateUpdated": "2026-01-14T17:39:00.721Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
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        ],
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              "product": "Linux",
              "programFiles": [
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                  "versionType": "semver"
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              "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]"
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        "assignerShortName": "Linux",
        "cveId": "CVE-2025-39925",
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        "dateReserved": "2025-04-16T07:20:57.147Z",
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}



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