CVE-2024-26777 fbdev: sis: Error out if pixclock equals zero

2024-04-0317:01:02

Linux

github.com

linux kernel

fbdev

sis

vulnerability fix

ioctl interface

divide-by-zero error

pixclock

commit 15cf0b

6.8 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

12.7%

JSON

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

fbdev: sis: Error out if pixclock equals zero

The userspace program could pass any values to the driver through
ioctl() interface. If the driver doesn’t check the value of pixclock,
it may cause divide-by-zero error.

In sisfb_check_var(), var->pixclock is used as a divisor to caculate
drate before it is checked against zero. Fix this by checking it
at the beginning.

This is similar to CVE-2022-3061 in i740fb which was fixed by
commit 15cf0b8.

CNA Affected

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
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        "status": "affected",
        "version": "1da177e4c3f4",
        "lessThan": "84246c35ca34",
        "versionType": "git"
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      {
        "status": "affected",
        "version": "1da177e4c3f4",
        "lessThan": "6db07619d173",
        "versionType": "git"
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        "status": "affected",
        "version": "1da177e4c3f4",
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        "status": "affected",
        "version": "1da177e4c3f4",
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      {
        "status": "affected",
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        "lessThan": "e421946be7d9",
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      }
    ],
    "programFiles": [
      "drivers/video/fbdev/sis/sis_main.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "unaffected",
        "version": "4.19.308",
        "versionType": "custom",
        "lessThanOrEqual": "4.19.*"
      },
      {
        "status": "unaffected",
        "version": "5.4.270",
        "versionType": "custom",
        "lessThanOrEqual": "5.4.*"
      },
      {
        "status": "unaffected",
        "version": "5.10.211",
        "versionType": "custom",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.150",
        "versionType": "custom",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.80",
        "versionType": "custom",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.19",
        "versionType": "custom",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.7.7",
        "versionType": "custom",
        "lessThanOrEqual": "6.7.*"
      },
      {
        "status": "unaffected",
        "version": "6.8",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/video/fbdev/sis/sis_main.c"
    ],
    "defaultStatus": "affected"
  }
]