fkie_cve-2021-4439
Vulnerability from fkie_nvd
Published
2024-06-20 12:15
Modified
2024-11-21 06:37
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: isdn: cpai: check ctr->cnr to avoid array index out of bound The cmtp_add_connection() would add a cmtp session to a controller and run a kernel thread to process cmtp. __module_get(THIS_MODULE); session->task = kthread_run(cmtp_session, session, "kcmtpd_ctr_%d", session->num); During this process, the kernel thread would call detach_capi_ctr() to detach a register controller. if the controller was not attached yet, detach_capi_ctr() would trigger an array-index-out-bounds bug. [ 46.866069][ T6479] UBSAN: array-index-out-of-bounds in drivers/isdn/capi/kcapi.c:483:21 [ 46.867196][ T6479] index -1 is out of range for type 'capi_ctr *[32]' [ 46.867982][ T6479] CPU: 1 PID: 6479 Comm: kcmtpd_ctr_0 Not tainted 5.15.0-rc2+ #8 [ 46.869002][ T6479] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-2 04/01/2014 [ 46.870107][ T6479] Call Trace: [ 46.870473][ T6479] dump_stack_lvl+0x57/0x7d [ 46.870974][ T6479] ubsan_epilogue+0x5/0x40 [ 46.871458][ T6479] __ubsan_handle_out_of_bounds.cold+0x43/0x48 [ 46.872135][ T6479] detach_capi_ctr+0x64/0xc0 [ 46.872639][ T6479] cmtp_session+0x5c8/0x5d0 [ 46.873131][ T6479] ? __init_waitqueue_head+0x60/0x60 [ 46.873712][ T6479] ? cmtp_add_msgpart+0x120/0x120 [ 46.874256][ T6479] kthread+0x147/0x170 [ 46.874709][ T6479] ? set_kthread_struct+0x40/0x40 [ 46.875248][ T6479] ret_from_fork+0x1f/0x30 [ 46.875773][ T6479]
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1f3e2e97c003f80c4b087092b225c8787ff91e4dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/24219a977bfe3d658687e45615c70998acdbac5aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/285e9210b1fab96a11c0be3ed5cea9dd48b6ac54Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7d91adc0ccb060ce564103315189466eb822cc6aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7f221ccbee4ec662e2292d490a43ce6c314c4594Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9b6b2db77bc3121fe435f1d4b56e34de443bec75Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cc20226e218a2375d50dd9ac14fb4121b43375ffPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e8b8de17e164c9f1b7777f1c6f99d05539000036Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/1f3e2e97c003f80c4b087092b225c8787ff91e4dPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/24219a977bfe3d658687e45615c70998acdbac5aPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/285e9210b1fab96a11c0be3ed5cea9dd48b6ac54Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/7d91adc0ccb060ce564103315189466eb822cc6aPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/7f221ccbee4ec662e2292d490a43ce6c314c4594Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/9b6b2db77bc3121fe435f1d4b56e34de443bec75Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/cc20226e218a2375d50dd9ac14fb4121b43375ffPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e8b8de17e164c9f1b7777f1c6f99d05539000036Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 5.15
linux linux_kernel 5.15
linux linux_kernel 5.15
linux linux_kernel 5.15
linux linux_kernel 5.15


To clipboard 

{
  "configurations": [
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nisdn: cpai: check ctr-\u003ecnr to avoid array index out of bound\n\nThe cmtp_add_connection() would add a cmtp session to a controller\nand run a kernel thread to process cmtp.\n\n\t__module_get(THIS_MODULE);\n\tsession-\u003etask = kthread_run(cmtp_session, session, \"kcmtpd_ctr_%d\",\n\t\t\t\t\t\t\t\tsession-\u003enum);\n\nDuring this process, the kernel thread would call detach_capi_ctr()\nto detach a register controller. if the controller\nwas not attached yet, detach_capi_ctr() would\ntrigger an array-index-out-bounds bug.\n\n[   46.866069][ T6479] UBSAN: array-index-out-of-bounds in\ndrivers/isdn/capi/kcapi.c:483:21\n[   46.867196][ T6479] index -1 is out of range for type \u0027capi_ctr *[32]\u0027\n[   46.867982][ T6479] CPU: 1 PID: 6479 Comm: kcmtpd_ctr_0 Not tainted\n5.15.0-rc2+ #8\n[   46.869002][ T6479] Hardware name: QEMU Standard PC (i440FX + PIIX,\n1996), BIOS 1.14.0-2 04/01/2014\n[   46.870107][ T6479] Call Trace:\n[   46.870473][ T6479]  dump_stack_lvl+0x57/0x7d\n[   46.870974][ T6479]  ubsan_epilogue+0x5/0x40\n[   46.871458][ T6479]  __ubsan_handle_out_of_bounds.cold+0x43/0x48\n[   46.872135][ T6479]  detach_capi_ctr+0x64/0xc0\n[   46.872639][ T6479]  cmtp_session+0x5c8/0x5d0\n[   46.873131][ T6479]  ? __init_waitqueue_head+0x60/0x60\n[   46.873712][ T6479]  ? cmtp_add_msgpart+0x120/0x120\n[   46.874256][ T6479]  kthread+0x147/0x170\n[   46.874709][ T6479]  ? set_kthread_struct+0x40/0x40\n[   46.875248][ T6479]  ret_from_fork+0x1f/0x30\n[   46.875773][ T6479]"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: isdn: cpai: verifique ctr-\u0026gt;cnr para evitar que el \u00edndice de matriz est\u00e9 fuera de l\u00edmite. cmtp_add_connection() agregar\u00eda una sesi\u00f3n cmtp a un controlador y ejecutar\u00eda un subproceso del kernel para procesar cmtp. __module_get(ESTE_M\u00d3DULO); sesi\u00f3n-\u0026gt;tarea = kthread_run(cmtp_session, sesi\u00f3n, \"kcmtpd_ctr_%d\", sesi\u00f3n-\u0026gt;num); Durante este proceso, el hilo del n\u00facleo llamar\u00eda a detach_capi_ctr() para desconectar un controlador de registro. Si el controlador a\u00fan no estaba conectado, detach_capi_ctr() desencadenar\u00eda un error de los l\u00edmites de \u00edndice de matriz. [ 46.866069][ T6479] UBSAN: \u00edndice de matriz fuera de los l\u00edmites en drivers/isdn/capi/kcapi.c:483:21 [ 46.867196][ T6479] el \u00edndice -1 est\u00e1 fuera de rango para el tipo \u0027capi_ctr *[ 32]\u0027 [ 46.867982][ T6479] CPU: 1 PID: 6479 Comm: kcmtpd_ctr_0 No contaminado 5.15.0-rc2+ #8 [ 46.869002][ T6479] Nombre de hardware: PC est\u00e1ndar QEMU (i440FX + PIIX, 1996), BIOS 1.14. 0-2 01/04/2014 [ 46.870107][ T6479] Seguimiento de llamadas: [ 46.870473][ T6479] dump_stack_lvl+0x57/0x7d [ 46.870974][ T6479] ubsan_epilogue+0x5/0x40 [ 46.871458][ T6479 ] __ubsan_handle_out_of_bounds.cold+0x43 /0x48 [ 46.872135][ T6479] detach_capi_ctr+0x64/0xc0 [ 46.872639][ T6479] cmtp_session+0x5c8/0x5d0 [ 46.873131][ T6479] ? __init_waitqueue_head+0x60/0x60 [ 46.873712][ T6479] ? cmtp_add_msgpart+0x120/0x120 [ 46.874256][ T6479] kthread+0x147/0x170 [ 46.874709][ T6479] ? set_kthread_struct+0x40/0x40 [ 46.875248][ T6479] ret_from_fork+0x1f/0x30 [ 46.875773][ T6479]"
    }
  ],
  "id": "CVE-2021-4439",
  "lastModified": "2024-11-21T06:37:44.080",
  "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"
      }
    ]
  },
  "published": "2024-06-20T12:15:10.447",
  "references": [
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      "tags": [
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      "url": "https://git.kernel.org/stable/c/24219a977bfe3d658687e45615c70998acdbac5a"
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      "url": "https://git.kernel.org/stable/c/285e9210b1fab96a11c0be3ed5cea9dd48b6ac54"
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-129"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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