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.
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Feb 27, 2025 | Feb 27, 2025 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Feb 26, 2025 |
| Ubuntu | — | Upgrade linux-lowlatencyUpgrade linuxUpgrade linux-gcpUpgrade linux-awsUpgrade linux-gkeUpgrade linux-kvmUpgrade linux-raspiUpgrade linux-azureUpgrade linux-ibmUpgrade linux-lowlatency-hwe-5.15Upgrade linux-azure-5.15Upgrade linux-intel-iotg-5.15Upgrade linux-intel-iotgUpgrade linux-realtimeUpgrade linux-hwe-5.15Upgrade linux-oracle | Mar 19, 2025 | Feb 26, 2025 |
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