CVE-2021-47500 iio: mma8452: Fix trigger reference couting

2024-05-2415:01:43

Linux

www.cve.org

linux kernel

vulnerability

reference counting

6.4 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

13.1%

JSON

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

iio: mma8452: Fix trigger reference couting

The mma8452 driver directly assigns a trigger to the struct iio_dev. The
IIO core when done using this trigger will call iio_trigger_put() to drop
the reference count by 1.

Without the matching iio_trigger_get() in the driver the reference count
can reach 0 too early, the trigger gets freed while still in use and a
use-after-free occurs.

Fix this by getting a reference to the trigger before assigning it to the
IIO device.

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/iio/accel/mma8452.c"
    ],
    "versions": [
      {
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    ]
  },
  {
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    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/iio/accel/mma8452.c"
    ],
    "versions": [
      {
        "version": "4.2",
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      },
      {
        "version": "0",
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        "versionType": "custom"
      },
      {
        "version": "4.4.295",
        "lessThanOrEqual": "4.4.*",
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      },
      {
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      {
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      {
        "version": "4.19.221",
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      },
      {
        "version": "5.4.165",
        "lessThanOrEqual": "5.4.*",
        "status": "unaffected",
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      },
      {
        "version": "5.10.85",
        "lessThanOrEqual": "5.10.*",
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      },
      {
        "version": "5.15.8",
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      },
      {
        "version": "5.16",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]