ghsa-8qj8-qf9j-579x
Vulnerability from github
Published
2024-10-21 15:32
Modified
2024-10-23 18:33
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Details

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

block, bfq: fix uaf for accessing waker_bfqq after splitting

After commit 42c306ed7233 ("block, bfq: don't break merge chain in bfq_split_bfqq()"), if the current procress is the last holder of bfqq, the bfqq can be freed after bfq_split_bfqq(). Hence recored the bfqq and then access bfqq->waker_bfqq may trigger UAF. What's more, the waker_bfqq may in the merge chain of bfqq, hence just recored waker_bfqq is still not safe.

Fix the problem by adding a helper bfq_waker_bfqq() to check if bfqq->waker_bfqq is in the merge chain, and current procress is the only holder.

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{
  "affected": [],
  "aliases": [
    "CVE-2024-49854"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-10-21T13:15:06Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nblock, bfq: fix uaf for accessing waker_bfqq after splitting\n\nAfter commit 42c306ed7233 (\"block, bfq: don\u0027t break merge chain in\nbfq_split_bfqq()\"), if the current procress is the last holder of bfqq,\nthe bfqq can be freed after bfq_split_bfqq(). Hence recored the bfqq and\nthen access bfqq-\u003ewaker_bfqq may trigger UAF. What\u0027s more, the waker_bfqq\nmay in the merge chain of bfqq, hence just recored waker_bfqq is still\nnot safe.\n\nFix the problem by adding a helper bfq_waker_bfqq() to check if\nbfqq-\u003ewaker_bfqq is in the merge chain, and current procress is the only\nholder.",
  "id": "GHSA-8qj8-qf9j-579x",
  "modified": "2024-10-23T18:33:07Z",
  "published": "2024-10-21T15:32:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-49854"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0780451f03bf518bc032a7c584de8f92e2d39d7f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0b8bda0ff17156cd3f60944527c9d8c9f99f1583"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1ba0403ac6447f2d63914fb760c44a3b19c44eaf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/63a07379fdb6c72450cb05294461c6016b8b7726"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cae58d19121a70329cf971359e2518c93fec04fe"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/de0456460f2abf921e356ed2bd8da87a376680bd"
    }
  ],
  "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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