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CVE PROGRAM SOURCE RECORDUnscored

CVE-2022-49147

block: Fix the maximum minor value is blk_alloc_ext_minor()

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: block: Fix the maximum minor value is blk_alloc_ext_minor() ida_alloc_range(..., min, max, ...) returns values from min to max, inclusive. So, NR_EXT_DEVT is a valid idx returned by blk_alloc_ext_minor(). This is an issue because in device_add_disk(), this value is used in: ddev->devt = MKDEV(disk->major, disk->first_minor); and NR_EXT_DEVT is '(1 << MINORBITS)'. So, should 'disk->first_minor' be NR_EXT_DEVT, it would overflow.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 22ae8ce8b89241c94ac00c237752c0ffa37ba5ae to < 5b9ac3727e4abb11c9cfbe9c0781fc05dfdd7cfbaffected
  • 22ae8ce8b89241c94ac00c237752c0ffa37ba5ae to < 0f8cf8f5ccbad25ed6828875b222dbab29d5c272affected
  • 22ae8ce8b89241c94ac00c237752c0ffa37ba5ae to < fbe2cc4525480ddd20c866bb5c0578071e01451aaffected
  • 22ae8ce8b89241c94ac00c237752c0ffa37ba5ae to < d1868328dec5ae2cf210111025fcbc71f78dd5caaffected

Linux Linux

Default version status: affected

  • 5.11affected
  • 0 to < 5.11unaffected
  • 5.15.33 to ≤ 5.15.*unaffected
  • 5.16.19 to ≤ 5.16.*unaffected
  • 5.17.2 to ≤ 5.17.*unaffected
  • 5.18 to ≤ *unaffected

References