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can: j1939: make j1939_session_activate() fail if device is no longer registered

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: can: j1939: make j1939_session_activate() fail if device is no longer registered syzbot is still reporting unregister_netdevice: waiting for vcan0 to become free. Usage count = 2 even after commit 93a27b5891b8 ("can: j1939: add missing calls in NETDEV_UNREGISTER notification handler") was added. A debug printk() patch found that j1939_session_activate() can succeed even after j1939_cancel_active_session() from j1939_netdev_notify(NETDEV_UNREGISTER) has completed. Since j1939_cancel_active_session() is processed with the session list lock held, checking ndev->reg_state in j1939_session_activate() with the session list lock held can reliably close the race window.

Announced Source revision 1
Original source ↗

CVE-2025-71182

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2025-71182

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "9d71dd0c70099914fcd063135da3c580865e924c",
        "lessThan": "ebb0dfd718dd31c8d3600612ca4b7207ec3d923a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9d71dd0c70099914fcd063135da3c580865e924c",
        "lessThan": "c3a4316e3c746af415c0fd6c6d489ad13f53714d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9d71dd0c70099914fcd063135da3c580865e924c",
        "lessThan": "46ca9dc978923c5e1247a9e9519240ba7ace413c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9d71dd0c70099914fcd063135da3c580865e924c",
        "lessThan": "78d87b72cebe2a993fd5b017e9f14fb6278f2eae",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9d71dd0c70099914fcd063135da3c580865e924c",
        "lessThan": "ba6f0d1832eeb5eb3a6dc5cb30e0f720b3cb3536",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9d71dd0c70099914fcd063135da3c580865e924c",
        "lessThan": "79dd3f1d9dd310c2af89b09c71f34d93973b200f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9d71dd0c70099914fcd063135da3c580865e924c",
        "lessThan": "5d5602236f5db19e8b337a2cd87a90ace5ea776d",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/can/j1939/transport.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.4"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.4",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.248",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.198",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.161",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.121",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.66",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.6",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/can/j1939/transport.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2025-71182

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#39174 · Revision 1
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Publisher date
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