GHSA-7848-X3WQ-CG7M

Vulnerability from github – Published: 2025-08-19 18:31 – Updated: 2025-11-26 18:30
VLAI?
Details

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

padata: Fix pd UAF once and for all

There is a race condition/UAF in padata_reorder that goes back to the initial commit. A reference count is taken at the start of the process in padata_do_parallel, and released at the end in padata_serial_worker.

This reference count is (and only is) required for padata_replace to function correctly. If padata_replace is never called then there is no issue.

In the function padata_reorder which serves as the core of padata, as soon as padata is added to queue->serial.list, and the associated spin lock released, that padata may be processed and the reference count on pd would go away.

Fix this by getting the next padata before the squeue->serial lock is released.

In order to make this possible, simplify padata_reorder by only calling it once the next padata arrives.

Severity ?
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2025-38584"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-08-19T17:15:35Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\npadata: Fix pd UAF once and for all\n\nThere is a race condition/UAF in padata_reorder that goes back\nto the initial commit.  A reference count is taken at the start\nof the process in padata_do_parallel, and released at the end in\npadata_serial_worker.\n\nThis reference count is (and only is) required for padata_replace\nto function correctly.  If padata_replace is never called then\nthere is no issue.\n\nIn the function padata_reorder which serves as the core of padata,\nas soon as padata is added to queue-\u003eserial.list, and the associated\nspin lock released, that padata may be processed and the reference\ncount on pd would go away.\n\nFix this by getting the next padata before the squeue-\u003eserial lock\nis released.\n\nIn order to make this possible, simplify padata_reorder by only\ncalling it once the next padata arrives.",
  "id": "GHSA-7848-x3wq-cg7m",
  "modified": "2025-11-26T18:30:57Z",
  "published": "2025-08-19T18:31:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38584"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/71203f68c7749609d7fc8ae6ad054bdedeb24f91"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cdf79bd2e1ecb3cc75631c73d8f4149be6019a52"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dbe3e911a59bda6de96e7cae387ff882c2c177fa"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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