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CVE-2022-49147
block: Fix the maximum minor value is blk_alloc_ext_minor()
Medium5.5EPSS 0.26%
- Published
- Updated
- Reserved
- Assigned by
- 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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.26% · top 82% of all CVEs (6 Nov 2026)
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The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected 22ae8ce8b89241c94ac00c237752c0ffa37ba5ae – < 5b9ac3727e4abb11c9cfbe9c0781fc05dfdd7cfb
- affected 22ae8ce8b89241c94ac00c237752c0ffa37ba5ae – < 0f8cf8f5ccbad25ed6828875b222dbab29d5c272
- affected 22ae8ce8b89241c94ac00c237752c0ffa37ba5ae – < fbe2cc4525480ddd20c866bb5c0578071e01451a
- affected 22ae8ce8b89241c94ac00c237752c0ffa37ba5ae – < d1868328dec5ae2cf210111025fcbc71f78dd5ca
- affected 5.11
- unaffected < 5.11
- unaffected 5.15.33 – ≤ 5.15.*
- unaffected 5.16.19 – ≤ 5.16.*
- unaffected 5.17.2 – ≤ 5.17.*
- unaffected 5.18 – ≤ *
References (4)
- https://git.kernel.org/stable/c/5b9ac3727e4abb11c9cfbe9c0781fc05dfdd7cfb (opens in a new tab)
- https://git.kernel.org/stable/c/0f8cf8f5ccbad25ed6828875b222dbab29d5c272 (opens in a new tab)
- https://git.kernel.org/stable/c/fbe2cc4525480ddd20c866bb5c0578071e01451a (opens in a new tab)
- https://git.kernel.org/stable/c/d1868328dec5ae2cf210111025fcbc71f78dd5ca (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://trackcve.app/cve/CVE-2022-49147)Record last updated .