CVE-2022-49147
block: Fix the maximum minor value is blk_alloc_ext_minor()
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | Feb 26, 2025 |
| Last Updated | May 11, 2026 |
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Affected Versions
Linux / Linux
22ae8ce8b89241c94ac00c237752c0ffa37ba5ae < 5b9ac3727e4abb11c9cfbe9c0781fc05dfdd7cfb 22ae8ce8b89241c94ac00c237752c0ffa37ba5ae < 0f8cf8f5ccbad25ed6828875b222dbab29d5c272 22ae8ce8b89241c94ac00c237752c0ffa37ba5ae < fbe2cc4525480ddd20c866bb5c0578071e01451a 22ae8ce8b89241c94ac00c237752c0ffa37ba5ae < d1868328dec5ae2cf210111025fcbc71f78dd5ca
Linux / Linux
5.11
References
git.kernel.org: https://git.kernel.org/stable/c/5b9ac3727e4abb11c9cfbe9c0781fc05dfdd7cfb git.kernel.org: https://git.kernel.org/stable/c/0f8cf8f5ccbad25ed6828875b222dbab29d5c272 git.kernel.org: https://git.kernel.org/stable/c/fbe2cc4525480ddd20c866bb5c0578071e01451a git.kernel.org: https://git.kernel.org/stable/c/d1868328dec5ae2cf210111025fcbc71f78dd5ca