FKIE_CVE-2021-47191

Vulnerability from fkie_nvd - Published: 2024-04-10 19:15 - Updated: 2026-08-04 10:16
Severity
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: scsi: scsi_debug: Fix out-of-bound read in resp_readcap16() The following warning was observed running syzkaller: [ 3813.830724] sg_write: data in/out 65466/242 bytes for SCSI command 0x9e-- guessing data in; [ 3813.830724] program syz-executor not setting count and/or reply_len properly [ 3813.836956] ================================================================== [ 3813.839465] BUG: KASAN: stack-out-of-bounds in sg_copy_buffer+0x157/0x1e0 [ 3813.841773] Read of size 4096 at addr ffff8883cf80f540 by task syz-executor/1549 [ 3813.846612] Call Trace: [ 3813.846995] dump_stack+0x108/0x15f [ 3813.847524] print_address_description+0xa5/0x372 [ 3813.848243] kasan_report.cold+0x236/0x2a8 [ 3813.849439] check_memory_region+0x240/0x270 [ 3813.850094] memcpy+0x30/0x80 [ 3813.850553] sg_copy_buffer+0x157/0x1e0 [ 3813.853032] sg_copy_from_buffer+0x13/0x20 [ 3813.853660] fill_from_dev_buffer+0x135/0x370 [ 3813.854329] resp_readcap16+0x1ac/0x280 [ 3813.856917] schedule_resp+0x41f/0x1630 [ 3813.858203] scsi_debug_queuecommand+0xb32/0x17e0 [ 3813.862699] scsi_dispatch_cmd+0x330/0x950 [ 3813.863329] scsi_request_fn+0xd8e/0x1710 [ 3813.863946] __blk_run_queue+0x10b/0x230 [ 3813.864544] blk_execute_rq_nowait+0x1d8/0x400 [ 3813.865220] sg_common_write.isra.0+0xe61/0x2420 [ 3813.871637] sg_write+0x6c8/0xef0 [ 3813.878853] __vfs_write+0xe4/0x800 [ 3813.883487] vfs_write+0x17b/0x530 [ 3813.884008] ksys_write+0x103/0x270 [ 3813.886268] __x64_sys_write+0x77/0xc0 [ 3813.886841] do_syscall_64+0x106/0x360 [ 3813.887415] entry_SYSCALL_64_after_hwframe+0x44/0xa9 This issue can be reproduced with the following syzkaller log: r0 = openat(0xffffffffffffff9c, &(0x7f0000000040)='./file0\x00', 0x26e1, 0x0) r1 = syz_open_procfs(0xffffffffffffffff, &(0x7f0000000000)='fd/3\x00') open_by_handle_at(r1, &(0x7f00000003c0)=ANY=[@ANYRESHEX], 0x602000) r2 = syz_open_dev$sg(&(0x7f0000000000), 0x0, 0x40782) write$binfmt_aout(r2, &(0x7f0000000340)=ANY=[@ANYBLOB="00000000deff000000000000000000000000000000000000000000000000000047f007af9e107a41ec395f1bded7be24277a1501ff6196a83366f4e6362bc0ff2b247f68a972989b094b2da4fb3607fcf611a22dd04310d28c75039d"], 0x126) In resp_readcap16() we get "int alloc_len" value -1104926854, and then pass the huge arr_len to fill_from_dev_buffer(), but arr is only 32 bytes. This leads to OOB in sg_copy_buffer(). To solve this issue, define alloc_len as u32.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3e20cb072679bdb47747ccc8bee3233a4cf0765aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4e3ace0051e7e504b55d239daab8789dd89b863cPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5b8bed6464ad6653586e30df046185fd816ad999Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/3e20cb072679bdb47747ccc8bee3233a4cf0765aPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/4e3ace0051e7e504b55d239daab8789dd89b863cPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/5b8bed6464ad6653586e30df046185fd816ad999Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/scsi/scsi_debug.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3e20cb072679bdb47747ccc8bee3233a4cf0765a",
              "status": "affected",
              "version": "c65b1445d153a66ca91b00c1f10187e495c17918",
              "versionType": "git"
            },
            {
              "lessThan": "5b8bed6464ad6653586e30df046185fd816ad999",
              "status": "affected",
              "version": "c65b1445d153a66ca91b00c1f10187e495c17918",
              "versionType": "git"
            },
            {
              "lessThan": "4e3ace0051e7e504b55d239daab8789dd89b863c",
              "status": "affected",
              "version": "c65b1445d153a66ca91b00c1f10187e495c17918",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/scsi/scsi_debug.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.18"
            },
            {
              "lessThan": "2.6.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.82",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.16",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "49103CD7-A3F7-441A-AAF4-11B8B707979D",
              "versionEndExcluding": "5.10.82",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "2128A085-4C0C-4C1E-9E9C-0DD868E2170F",
              "versionEndExcluding": "5.15.5",
              "versionStartIncluding": "5.11",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: scsi_debug: Fix out-of-bound read in resp_readcap16()\n\nThe following warning was observed running syzkaller:\n\n[ 3813.830724] sg_write: data in/out 65466/242 bytes for SCSI command 0x9e-- guessing data in;\n[ 3813.830724]    program syz-executor not setting count and/or reply_len properly\n[ 3813.836956] ==================================================================\n[ 3813.839465] BUG: KASAN: stack-out-of-bounds in sg_copy_buffer+0x157/0x1e0\n[ 3813.841773] Read of size 4096 at addr ffff8883cf80f540 by task syz-executor/1549\n[ 3813.846612] Call Trace:\n[ 3813.846995]  dump_stack+0x108/0x15f\n[ 3813.847524]  print_address_description+0xa5/0x372\n[ 3813.848243]  kasan_report.cold+0x236/0x2a8\n[ 3813.849439]  check_memory_region+0x240/0x270\n[ 3813.850094]  memcpy+0x30/0x80\n[ 3813.850553]  sg_copy_buffer+0x157/0x1e0\n[ 3813.853032]  sg_copy_from_buffer+0x13/0x20\n[ 3813.853660]  fill_from_dev_buffer+0x135/0x370\n[ 3813.854329]  resp_readcap16+0x1ac/0x280\n[ 3813.856917]  schedule_resp+0x41f/0x1630\n[ 3813.858203]  scsi_debug_queuecommand+0xb32/0x17e0\n[ 3813.862699]  scsi_dispatch_cmd+0x330/0x950\n[ 3813.863329]  scsi_request_fn+0xd8e/0x1710\n[ 3813.863946]  __blk_run_queue+0x10b/0x230\n[ 3813.864544]  blk_execute_rq_nowait+0x1d8/0x400\n[ 3813.865220]  sg_common_write.isra.0+0xe61/0x2420\n[ 3813.871637]  sg_write+0x6c8/0xef0\n[ 3813.878853]  __vfs_write+0xe4/0x800\n[ 3813.883487]  vfs_write+0x17b/0x530\n[ 3813.884008]  ksys_write+0x103/0x270\n[ 3813.886268]  __x64_sys_write+0x77/0xc0\n[ 3813.886841]  do_syscall_64+0x106/0x360\n[ 3813.887415]  entry_SYSCALL_64_after_hwframe+0x44/0xa9\n\nThis issue can be reproduced with the following syzkaller log:\n\nr0 = openat(0xffffffffffffff9c, \u0026(0x7f0000000040)=\u0027./file0\\x00\u0027, 0x26e1, 0x0)\nr1 = syz_open_procfs(0xffffffffffffffff, \u0026(0x7f0000000000)=\u0027fd/3\\x00\u0027)\nopen_by_handle_at(r1, \u0026(0x7f00000003c0)=ANY=[@ANYRESHEX], 0x602000)\nr2 = syz_open_dev$sg(\u0026(0x7f0000000000), 0x0, 0x40782)\nwrite$binfmt_aout(r2, \u0026(0x7f0000000340)=ANY=[@ANYBLOB=\"00000000deff000000000000000000000000000000000000000000000000000047f007af9e107a41ec395f1bded7be24277a1501ff6196a83366f4e6362bc0ff2b247f68a972989b094b2da4fb3607fcf611a22dd04310d28c75039d\"], 0x126)\n\nIn resp_readcap16() we get \"int alloc_len\" value -1104926854, and then pass\nthe huge arr_len to fill_from_dev_buffer(), but arr is only 32 bytes. This\nleads to OOB in sg_copy_buffer().\n\nTo solve this issue, define alloc_len as u32."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: scsi: scsi_debug: Se corrige la lectura fuera de los l\u00edmites en resp_readcap16(). Se observ\u00f3 la siguiente advertencia al ejecutar syzkaller: [ 3813.830724] sg_write: datos de entrada/salida 65466/242 bytes para el comando SCSI 0x9e-- adivinando datos de entrada; [ 3813.830724] El programa syz-executor no establece count y/o reply_len correctamente [ 3813.836956] ====================================================================== [ 3813.839465] ERROR: KASAN: pila fuera de los l\u00edmites en sg_copy_buffer+0x157/0x1e0 [ 3813.841773] Lectura de tama\u00f1o 4096 en la direcci\u00f3n ffff8883cf80f540 por la tarea syz-executor/1549 [ 3813.846612] Seguimiento de llamadas: [ 3813.846995] dump_stack+0x108/0x15f [ 3813.847524] print_address_description+0xa5/0x372 [ 3813.848243] kasan_report.cold+0x236/0x2a8 [ 3813.849439] check_memory_region+0x240/0x270 [ 3813.850094] memcpy+0x30/0x80 [ 3813.850553] sg_copy_buffer+0x157/0x1e0 [ 3813.853032] sg_copy_from_buffer+0x13/0x20 [ 3813.853660] llenar_desde_buffer_dev+0x135/0x370 [ 3813.854329] resp_readcap16+0x1ac/0x280 [ 3813.856917] schedule_resp+0x41f/0x1630 [ 3813.858203] comando_cola_de_depuraci\u00f3n_scsi+0xb32/0x17e0 [ 3813.862699] comando_env\u00edo_scsi+0x330/0x950 [ 3813.863329] funci\u00f3n_solicitud_scsi+0xd8e/0x1710 [ 3813.863946] cola_ejecuci\u00f3n_blk+0x10b/0x230 [ 3813.864544] blk_execute_rq_nowait+0x1d8/0x400 [ 3813.865220] sg_common_write.isra.0+0xe61/0x2420 [ 3813.871637] sg_write+0x6c8/0xef0 [ 3813.878853] __vfs_write+0xe4/0x800 [ 3813.883487] vfs_write+0x17b/0x530 [ 3813.884008] ksys_write+0x103/0x270 [ 3813.886268] __x64_sys_write+0x77/0xc0 [ 3813.886841] do_syscall_64+0x106/0x360 [ 3813.887415] entry_SYSCALL_64_after_hwframe+0x44/0xa9 Este problema se puede reproducir con el siguiente registro de syzkaller: r0 = openat(0xffffffffffffff9c, \u0026amp;(0x7f0000000040)=\u0027./file0\\x00\u0027, 0x26e1, 0x0) r1 = syz_open_procfs(0xffffffffffffffff, \u0026amp;(0x7f0000000000)=\u0027fd/3\\x00\u0027) open_by_handle_at(r1, \u0026amp;(0x7f00000003c0)=ANY=[@ANYRESHEX], 0x602000) r2 = syz_open_dev$sg(\u0026amp;(0x7f0000000000), 0x0, 0x40782) escribir$binfmt_aout(r2, \u0026amp;(0x7f0000000340)=ANY=[@ANYBLOB=\"00000000deff000000000000000000000000000000000000000000000000000000000000047f007af9e107a41ec395f1bded7be24277a1501ff6196a83366f4e6362bc0ff2b247f68a972989b094b2da4fb3607fcf611a22dd04310d28c75039d\"], 0x126) En resp_readcap16() obtenemos el valor \"int alloc_len\" -1104926854, y luego pasamos la enorme arr_len se usa para fill_from_dev_buffer(), pero arr solo tiene 32 bytes. Esto genera OOB en sg_copy_buffer(). Para resolver este problema, defina alloc_len como u32."
    }
  ],
  "id": "CVE-2021-47191",
  "lastModified": "2026-08-04T10:16:51.587",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.2,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.2,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2021-47191",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-06-17T18:03:54.717932Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2024-04-10T19:15:47.663",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/3e20cb072679bdb47747ccc8bee3233a4cf0765a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/4e3ace0051e7e504b55d239daab8789dd89b863c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/5b8bed6464ad6653586e30df046185fd816ad999"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/3e20cb072679bdb47747ccc8bee3233a4cf0765a"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/4e3ace0051e7e504b55d239daab8789dd89b863c"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/5b8bed6464ad6653586e30df046185fd816ad999"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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