ghsa-998f-8276-5gr2
Vulnerability from github
Published
2025-09-05 18:31
Modified
2025-11-26 00:30
Severity ?
4.7 (Medium) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Details

In the Linux kernel, the following vulnerability has been resolved:

net: kcm: Fix race condition in kcm_unattach()

syzbot found a race condition when kcm_unattach(psock) and kcm_release(kcm) are executed at the same time.

kcm_unattach() is missing a check of the flag kcm->tx_stopped before calling queue_work().

If the kcm has a reserved psock, kcm_unattach() might get executed between cancel_work_sync() and unreserve_psock() in kcm_release(), requeuing kcm->tx_work right before kcm gets freed in kcm_done().

Remove kcm->tx_stopped and replace it by the less error-prone disable_work_sync().

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{
  "affected": [],
  "aliases": [
    "CVE-2025-38717"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-362"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-09-04T16:15:41Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: kcm: Fix race condition in kcm_unattach()\n\nsyzbot found a race condition when kcm_unattach(psock)\nand kcm_release(kcm) are executed at the same time.\n\nkcm_unattach() is missing a check of the flag\nkcm-\u003etx_stopped before calling queue_work().\n\nIf the kcm has a reserved psock, kcm_unattach() might get executed\nbetween cancel_work_sync() and unreserve_psock() in kcm_release(),\nrequeuing kcm-\u003etx_work right before kcm gets freed in kcm_done().\n\nRemove kcm-\u003etx_stopped and replace it by the less\nerror-prone disable_work_sync().",
  "id": "GHSA-998f-8276-5gr2",
  "modified": "2025-11-26T00:30:16Z",
  "published": "2025-09-05T18:31:17Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38717"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/52565a935213cd6a8662ddb8efe5b4219343a25d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7275dc3bb8f91b23125ff3f47b6529935cf46152"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/798733ee5d5788b12e8a52db1519abc17e826f69"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c0bffbc92a1ca3960fb9cdb8e9f75a68468eb308"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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