CVE-2021-47477 comedi: dt9812: fix DMA buffers on stack

2024-05-2208:19:30

Linux

www.cve.org

vulnerability

linux kernel

comedi

dt9812

dma

usb transfer

stack info leak

6.5 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

13.1%

JSON

In the Linux kernel, the following vulnerability has been resolved:

comedi: dt9812: fix DMA buffers on stack

USB transfer buffers are typically mapped for DMA and must not be
allocated on the stack or transfers will fail.

Allocate proper transfer buffers in the various command helpers and
return an error on short transfers instead of acting on random stack
data.

Note that this also fixes a stack info leak on systems where DMA is not
used as 32 bytes are always sent to the device regardless of how short
the command is.

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/comedi/drivers/dt9812.c"
    ],
    "versions": [
      {
        "version": "63274cd7d38a",
        "lessThan": "a6af69768d5c",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "63274cd7d38a",
        "lessThan": "365a346cda82",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "63274cd7d38a",
        "lessThan": "8a52bc480992",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "63274cd7d38a",
        "lessThan": "39ea61037ae7",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "63274cd7d38a",
        "lessThan": "3efb7af8ac43",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "63274cd7d38a",
        "lessThan": "786f5b034504",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "63274cd7d38a",
        "lessThan": "3ac273d154d6",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "63274cd7d38a",
        "lessThan": "20cebb8b620d",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "63274cd7d38a",
        "lessThan": "536de747bc48",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/comedi/drivers/dt9812.c"
    ],
    "versions": [
      {
        "version": "2.6.29",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "2.6.29",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.4.292",
        "lessThanOrEqual": "4.4.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.9.290",
        "lessThanOrEqual": "4.9.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.14.255",
        "lessThanOrEqual": "4.14.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.19.217",
        "lessThanOrEqual": "4.19.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.4.159",
        "lessThanOrEqual": "5.4.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.10.79",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.14.18",
        "lessThanOrEqual": "5.14.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.15.2",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.16",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]