fkie_cve-2024-49854
Vulnerability from fkie_nvd
Published
2024-10-21 13:15
Modified
2024-10-23 16:29
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0780451f03bf518bc032a7c584de8f92e2d39d7fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0b8bda0ff17156cd3f60944527c9d8c9f99f1583Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1ba0403ac6447f2d63914fb760c44a3b19c44eafPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/63a07379fdb6c72450cb05294461c6016b8b7726Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cae58d19121a70329cf971359e2518c93fec04fePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/de0456460f2abf921e356ed2bd8da87a376680bdPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *


To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bloqueo, bfq: arregle uaf por acceder waker_bfqq despues de separar Despu\u00e9s de el commit 42c306ed7233 (\"block, bfq: don\u0027t break merge chain in bfq_split_bfqq()\"), si el proceso actual es el \u00faltimo contenedor de bfqq, el bfqq se puede liberar despu\u00e9s de bfq_split_bfqq(). Por lo tanto, grabar el bfqq y luego acceder a bfqq-\u0026gt;waker_bfqq puede activar UAF. Adem\u00e1s, waker_bfqq puede estar en la cadena de fusi\u00f3n de bfqq, por lo tanto, grabar solo waker_bfqq sigue sin ser seguro. Solucione el problema a\u00f1adiendo un ayudante bfq_waker_bfqq() para comprobar si bfqq-\u0026gt;waker_bfqq est\u00e1 en la cadena de fusi\u00f3n y el proceso actual es el \u00fanico contenedor."
    }
  ],
  "id": "CVE-2024-49854",
  "lastModified": "2024-10-23T16:29:32.857",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
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  "published": "2024-10-21T13:15:06.203",
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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          "lang": "en",
          "value": "CWE-416"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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