cve-2022-48801
Vulnerability from cvelistv5
Published
2024-07-16 11:43
Modified
2024-11-04 12:16
Severity ?
Summary
iio: buffer: Fix file related error handling in IIO_BUFFER_GET_FD_IOCTL
Impacted products
Vendor Product Version
Linux Linux Version: 5.13
Show details on NVD website


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            "url": "https://git.kernel.org/stable/c/c72ea20503610a4a7ba26c769357d31602769c01"
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        "title": "CVE Program Container"
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        "metrics": [
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              "content": {
                "id": "CVE-2022-48801",
                "options": [
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                    "Exploitation": "none"
                  },
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                    "Automatable": "no"
                  },
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                    "Technical Impact": "partial"
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          "product": "Linux",
          "programFiles": [
            "drivers/iio/industrialio-buffer.c"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niio: buffer: Fix file related error handling in IIO_BUFFER_GET_FD_IOCTL\n\nIf we fail to copy the just created file descriptor to userland, we\ntry to clean up by putting back \u0027fd\u0027 and freeing \u0027ib\u0027. The code uses\nput_unused_fd() for the former which is wrong, as the file descriptor\nwas already published by fd_install() which gets called internally by\nanon_inode_getfd().\n\nThis makes the error handling code leaving a half cleaned up file\ndescriptor table around and a partially destructed \u0027file\u0027 object,\nallowing userland to play use-after-free tricks on us, by abusing\nthe still usable fd and making the code operate on a dangling\n\u0027file-\u003eprivate_data\u0027 pointer.\n\nInstead of leaving the kernel in a partially corrupted state, don\u0027t\nattempt to explicitly clean up and leave this to the process exit\npath that\u0027ll release any still valid fds, including the one created\nby the previous call to anon_inode_getfd(). Simply return -EFAULT to\nindicate the error."
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    "dateReserved": "2024-07-16T11:38:08.895Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2022-48801\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-07-16T12:15:04.630\",\"lastModified\":\"2024-11-21T07:34:06.907\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\niio: buffer: Fix file related error handling in IIO_BUFFER_GET_FD_IOCTL\\n\\nIf we fail to copy the just created file descriptor to userland, we\\ntry to clean up by putting back \u0027fd\u0027 and freeing \u0027ib\u0027. The code uses\\nput_unused_fd() for the former which is wrong, as the file descriptor\\nwas already published by fd_install() which gets called internally by\\nanon_inode_getfd().\\n\\nThis makes the error handling code leaving a half cleaned up file\\ndescriptor table around and a partially destructed \u0027file\u0027 object,\\nallowing userland to play use-after-free tricks on us, by abusing\\nthe still usable fd and making the code operate on a dangling\\n\u0027file-\u003eprivate_data\u0027 pointer.\\n\\nInstead of leaving the kernel in a partially corrupted state, don\u0027t\\nattempt to explicitly clean up and leave this to the process exit\\npath that\u0027ll release any still valid fds, including the one created\\nby the previous call to anon_inode_getfd(). Simply return -EFAULT to\\nindicate the error.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: iio: buffer: corrige el manejo de errores relacionados con archivos en IIO_BUFFER_GET_FD_IOCTL Si no logramos copiar el descriptor de archivo reci\u00e9n creado en la zona de usuario, intentamos limpiar colocando de nuevo \u0027fd\u0027 y liberando \u0027 ib\u0027. El c\u00f3digo usa put_unused_fd() para el primero, lo cual es incorrecto, ya que el descriptor de archivo ya fue publicado por fd_install(), que es llamado internamente por anon_inode_getfd(). Esto hace que el c\u00f3digo de manejo de errores deje una tabla de descriptores de archivos medio limpia y un objeto \u0027archivo\u0027 parcialmente destruido, lo que permite que Userland nos juegue trucos de use-after-free, abusando del fd a\u00fan utilizable y haciendo que el c\u00f3digo funcione en un puntero \u0027archivo-\u0026gt;datos_privados\u0027 colgando. En lugar de dejar el kernel en un estado parcialmente da\u00f1ado, no intente limpiar expl\u00edcitamente y dejar esto en la ruta de salida del proceso que liberar\u00e1 cualquier fds a\u00fan v\u00e1lido, incluido el creado por la llamada anterior a anon_inode_getfd(). Simplemente devuelva -EFAULT para indicar el error.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/202071d2518537866d291aa7cf26af54e674f4d4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b7f54894aa7517d2b6c797a499b9f491e9db9083\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c72ea20503610a4a7ba26c769357d31602769c01\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/202071d2518537866d291aa7cf26af54e674f4d4\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/b7f54894aa7517d2b6c797a499b9f491e9db9083\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/c72ea20503610a4a7ba26c769357d31602769c01\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}"
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}


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