CVE-2021-47475

2024-05-2209:15:09

416baaa9-dc9f-4396-8d5f-8c081fb06d67

web.nvd.nist.gov

linux

comedi driver

usb transfer buffers

vulnerability resolution

buffer overflows

device descriptors

nvd

6.6 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

13.0%

JSON

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

comedi: vmk80xx: fix transfer-buffer overflows

The driver uses endpoint-sized USB transfer buffers but up until
recently had no sanity checks on the sizes.

Commit e1f13c879a7c (“staging: comedi: check validity of wMaxPacketSize
of usb endpoints found”) inadvertently fixed NULL-pointer dereferences
when accessing the transfer buffers in case a malicious device has a
zero wMaxPacketSize.

Make sure to allocate buffers large enough to handle also the other
accesses that are done without a size check (e.g. byte 18 in
vmk80xx_cnt_insn_read() for the VMK8061_MODEL) to avoid writing beyond
the buffers, for example, when doing descriptor fuzzing.

The original driver was for a low-speed device with 8-byte buffers.
Support was later added for a device that uses bulk transfers and is
presumably a full-speed device with a maximum 64-byte wMaxPacketSize.

Affected configurations

Vulners

Node

linuxlinux_kernelRange2.6.31–4.4.292

linuxlinux_kernelRange4.5.0–4.9.290

linuxlinux_kernelRange4.10.0–4.14.255

linuxlinux_kernelRange4.15.0–4.19.217

linuxlinux_kernelRange4.20.0–5.4.159

linuxlinux_kernelRange5.5.0–5.10.79

linuxlinux_kernelRange5.11.0–5.14.18

linuxlinux_kernelRange5.15.0–5.15.2

linuxlinux_kernelRange5.16.0≥

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/vmk80xx.c"
    ],
    "versions": [
      {
        "version": "985cafccbf9b",
        "lessThan": "5229159f1d05",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "985cafccbf9b",
        "lessThan": "ec85bcff4ed0",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "985cafccbf9b",
        "lessThan": "40d2a7e278e2",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "985cafccbf9b",
        "lessThan": "7a2021b896de",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "985cafccbf9b",
        "lessThan": "199acd8c110e",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "985cafccbf9b",
        "lessThan": "33d7a470730d",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "985cafccbf9b",
        "lessThan": "278484ae9329",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "985cafccbf9b",
        "lessThan": "06ac746d57e6",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "985cafccbf9b",
        "lessThan": "a23461c47482",
        "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/vmk80xx.c"
    ],
    "versions": [
      {
        "version": "2.6.31",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "2.6.31",
        "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"
      }
    ]
  }
]