fkie_cve-2022-48821
Vulnerability from fkie_nvd
Published
2024-07-16 12:15
Modified
2025-09-25 19:36
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: misc: fastrpc: avoid double fput() on failed usercopy If the copy back to userland fails for the FASTRPC_IOCTL_ALLOC_DMA_BUFF ioctl(), we shouldn't assume that 'buf->dmabuf' is still valid. In fact, dma_buf_fd() called fd_install() before, i.e. "consumed" one reference, leaving us with none. Calling dma_buf_put() will therefore put a reference we no longer own, leading to a valid file descritor table entry for an already released 'file' object which is a straight use-after-free. Simply avoid calling dma_buf_put() and rely on the process exit code to do the necessary cleanup, if needed, i.e. if the file descriptor is still valid.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/46963e2e0629cb31c96b1d47ddd89dc3d8990b34Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4e6fd2b5fcf8e7119305a6042bd92e7f2b9ed215Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/76f85c307ef9f10aa2cef1b1d5ee654c1f3345fcPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a5ce7ee5fcc07583159f54ab4af5164de00148f5Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e4382d0a39f9a1e260d62fdc079ddae5293c037dPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/46963e2e0629cb31c96b1d47ddd89dc3d8990b34Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/4e6fd2b5fcf8e7119305a6042bd92e7f2b9ed215Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/76f85c307ef9f10aa2cef1b1d5ee654c1f3345fcPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/a5ce7ee5fcc07583159f54ab4af5164de00148f5Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e4382d0a39f9a1e260d62fdc079ddae5293c037dPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 5.17
linux linux_kernel 5.17
linux linux_kernel 5.17


To clipboard 

{
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmisc: fastrpc: avoid double fput() on failed usercopy\n\nIf the copy back to userland fails for the FASTRPC_IOCTL_ALLOC_DMA_BUFF\nioctl(), we shouldn\u0027t assume that \u0027buf-\u003edmabuf\u0027 is still valid. In fact,\ndma_buf_fd() called fd_install() before, i.e. \"consumed\" one reference,\nleaving us with none.\n\nCalling dma_buf_put() will therefore put a reference we no longer own,\nleading to a valid file descritor table entry for an already released\n\u0027file\u0027 object which is a straight use-after-free.\n\nSimply avoid calling dma_buf_put() and rely on the process exit code to\ndo the necessary cleanup, if needed, i.e. if the file descriptor is\nstill valid."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: misc: fastrpc: evitar doble fput() en copia de usuario fallida. Si la copia al \u00e1rea de usuario falla para FASTRPC_IOCTL_ALLOC_DMA_BUFF ioctl(), no debemos asumir que \u0027buf-\u0026gt;dmabuf\u0027 aun es v\u00e1lido. De hecho, dma_buf_fd() llam\u00f3 a fd_install() antes, es decir, \"consumi\u00f3\" una referencia, dej\u00e1ndonos sin ninguna. Por lo tanto, llamar a dma_buf_put() colocar\u00e1 una referencia que ya no poseemos, lo que conducir\u00e1 a una entrada v\u00e1lida en la tabla de descripci\u00f3n de archivos para un objeto \u0027archivo\u0027 ya publicado que es un use-after-free directo. Simplemente evite llamar a dma_buf_put() y conf\u00ede en el c\u00f3digo de salida del proceso para realizar la limpieza necesaria, si es necesario, es decir, si el descriptor del archivo a\u00fan es v\u00e1lido."
    }
  ],
  "id": "CVE-2022-48821",
  "lastModified": "2025-09-25T19:36:51.900",
  "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": "2024-07-16T12:15:06.010",
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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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