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.
Metrics
CVSS 3.1 5.5/10
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HAffected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 22ae8ce8b89241c94ac00c237752c0ffa37ba5ae, < 5b9ac3727e4abb11c9cfbe9c0781fc05dfdd7cfb; >= 22ae8ce8b89241c94ac00c237752c0ffa37ba5ae, < 0f8cf8f5ccbad25ed6828875b222dbab29d5c272; >= 22ae8ce8b89241c94ac00c237752c0ffa37ba5ae, < fbe2cc4525480ddd20c866bb5c0578071e01451a; >= 22ae8ce8b89241c94ac00c237752c0ffa37ba5ae, < d1868328dec5ae2cf210111025fcbc71f78dd5ca |
| Linux | Linux | 5.11 |
References
- https://git.kernel.org/stable/c/0f8cf8f5ccbad25ed6828875b222dbab29d5c272Patch
- https://git.kernel.org/stable/c/5b9ac3727e4abb11c9cfbe9c0781fc05dfdd7cfbPatch
- https://git.kernel.org/stable/c/d1868328dec5ae2cf210111025fcbc71f78dd5caPatch
- https://git.kernel.org/stable/c/fbe2cc4525480ddd20c866bb5c0578071e01451aPatch
Timeline
- Published
- Feb 26, 2025
- Last modified
- Jun 17, 2026
- NVD status
- Analyzed