CVE-2022-49147

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Source
https://cve.org/CVERecord?id=CVE-2022-49147
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49147.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2022-49147
Downstream
Related
Published
2025-02-26T01:55:15Z
Modified
2026-08-12T03:51:13Z
Summary
block: Fix the maximum minor value is blk_alloc_ext_minor()
Details

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.

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49147.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
22ae8ce8b89241c94ac00c237752c0ffa37ba5ae
Fixed
5b9ac3727e4abb11c9cfbe9c0781fc05dfdd7cfb
Fixed
0f8cf8f5ccbad25ed6828875b222dbab29d5c272
Fixed
fbe2cc4525480ddd20c866bb5c0578071e01451a
Fixed
d1868328dec5ae2cf210111025fcbc71f78dd5ca

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49147.json"

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
5.11.0
Fixed
5.15.33
Type
ECOSYSTEM
Events
Introduced
5.16.0
Fixed
5.16.19
Type
ECOSYSTEM
Events
Introduced
5.17.0
Fixed
5.17.2

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49147.json"