Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 22ae8ce8b89241c94ac00c237752c0ffa37ba5ae before 5b9ac3727e4abb11c9cfbe9c0781fc05dfdd7cfb; affected 22ae8ce8b89241c94ac00c237752c0ffa37ba5ae before 0f8cf8f5ccbad25ed6828875b222dbab29d5c272; affected 22ae8ce8b89241c94ac00c237752c0ffa37ba5ae before fbe2cc4525480ddd20c866bb5c0578071e01451a; affected 22ae8ce8b89241c94ac00c237752c0ffa37ba5ae before d1868328dec5ae2cf210111025fcbc71f78dd5ca |
| Linux / Linux | affected 5.11; unaffected 0 before 5.11; unaffected 5.15.33 through 5.15.*; unaffected 5.16.19 through 5.16.*; unaffected 5.17.2 through 5.17.*; unaffected 5.18 through * |
CWE
No CWE identifiers supplied.