FKIE_CVE-2022-49765

Vulnerability from fkie_nvd - Published: 2025-05-01 15:15 - Updated: 2025-11-06 21:58
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net/9p: use a dedicated spinlock for trans_fd Shamelessly copying the explanation from Tetsuo Handa's suggested patch[1] (slightly reworded): syzbot is reporting inconsistent lock state in p9_req_put()[2], for p9_tag_remove() from p9_req_put() from IRQ context is using spin_lock_irqsave() on "struct p9_client"->lock but trans_fd (not from IRQ context) is using spin_lock(). Since the locks actually protect different things in client.c and in trans_fd.c, just replace trans_fd.c's lock by a new one specific to the transport (client.c's protect the idr for fid/tag allocations, while trans_fd.c's protects its own req list and request status field that acts as the transport's state machine)
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/296ab4a813841ba1d5f40b03190fd1bd8f25aab0Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/43bbadb7e4636dc02f6a283c2a39e6438e6173cdPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/717b9b4f38703d7f5293059e3a242d16f76fa045Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
To clipboard 

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              "matchCriteriaId": "15DB3C25-553E-4AFA-AD20-45C84054F9CD",
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              "vulnerable": true
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/9p: use a dedicated spinlock for trans_fd\n\nShamelessly copying the explanation from Tetsuo Handa\u0027s suggested\npatch[1] (slightly reworded):\nsyzbot is reporting inconsistent lock state in p9_req_put()[2],\nfor p9_tag_remove() from p9_req_put() from IRQ context is using\nspin_lock_irqsave() on \"struct p9_client\"-\u003elock but trans_fd\n(not from IRQ context) is using spin_lock().\n\nSince the locks actually protect different things in client.c and in\ntrans_fd.c, just replace trans_fd.c\u0027s lock by a new one specific to the\ntransport (client.c\u0027s protect the idr for fid/tag allocations,\nwhile trans_fd.c\u0027s protects its own req list and request status field\nthat acts as the transport\u0027s state machine)"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/9p: uso de un spinlock dedicado para trans_fd. Copiando descaradamente la explicaci\u00f3n del parche sugerido por Tetsuo Handa[1] (ligeramente reformulada): syzbot reporta un estado de bloqueo inconsistente en p9_req_put()[2], para p9_tag_remove() desde p9_req_put() desde el contexto IRQ, se usa spin_lock_irqsave() en \"struct p9_client\"-\u0026gt;lock, pero trans_fd (no desde el contexto IRQ) usa spin_lock(). Dado que los bloqueos protegen elementos diferentes en client.c y en trans_fd.c, simplemente reemplace el bloqueo de trans_fd.c por uno nuevo espec\u00edfico para el transporte (el de client.c protege el IDR para las asignaciones de FID/etiqueta, mientras que el de trans_fd.c protege su propia lista de solicitudes y el campo de estado de la solicitud, que act\u00faa como la m\u00e1quina de estados del transporte)."
    }
  ],
  "id": "CVE-2022-49765",
  "lastModified": "2025-11-06T21:58:27.243",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
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  "published": "2025-05-01T15:15:59.277",
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  "vulnStatus": "Analyzed",
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          "lang": "en",
          "value": "CWE-667"
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      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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