cve-2021-47191
Vulnerability from cvelistv5
Published
2024-04-10 18:56
Modified
2024-11-04 12:01
Severity ?
Summary
scsi: scsi_debug: Fix out-of-bound read in resp_readcap16()
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3e20cb072679bdb47747ccc8bee3233a4cf0765a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4e3ace0051e7e504b55d239daab8789dd89b863c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5b8bed6464ad6653586e30df046185fd816ad999
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

To clipboard 

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              "content": {
                "id": "CVE-2021-47191",
                "options": [
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                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
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                "role": "CISA Coordinator",
                "timestamp": "2024-06-17T18:03:54.717932Z",
                "version": "2.0.3"
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          "dateUpdated": "2024-06-17T18:04:58.134Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T05:32:07.284Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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            "url": "https://git.kernel.org/stable/c/4e3ace0051e7e504b55d239daab8789dd89b863c"
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        "title": "CVE Program Container"
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    ],
    "cna": {
      "affected": [
        {
          "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": [
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              "lessThan": "3e20cb072679",
              "status": "affected",
              "version": "1da177e4c3f4",
              "versionType": "git"
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              "status": "affected",
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          "product": "Linux",
          "programFiles": [
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "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"
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      "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."
        }
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      "providerMetadata": {
        "dateUpdated": "2024-11-04T12:01:13.618Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
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          "url": "https://git.kernel.org/stable/c/3e20cb072679bdb47747ccc8bee3233a4cf0765a"
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          "url": "https://git.kernel.org/stable/c/5b8bed6464ad6653586e30df046185fd816ad999"
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        {
          "url": "https://git.kernel.org/stable/c/4e3ace0051e7e504b55d239daab8789dd89b863c"
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      "title": "scsi: scsi_debug: Fix out-of-bound read in resp_readcap16()",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47191",
    "datePublished": "2024-04-10T18:56:29.455Z",
    "dateReserved": "2024-03-25T09:12:14.113Z",
    "dateUpdated": "2024-11-04T12:01:13.618Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47191\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-04-10T19:15:47.663\",\"lastModified\":\"2024-04-10T19:49:51.183\",\"vulnStatus\":\"Awaiting Analysis\",\"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.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3e20cb072679bdb47747ccc8bee3233a4cf0765a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4e3ace0051e7e504b55d239daab8789dd89b863c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5b8bed6464ad6653586e30df046185fd816ad999\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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