CVE-2025-39795
Description
From CVE.org
In the Linux kernel, the following vulnerability has been resolved: block: avoid possible overflow for chunk_sectors check in blk_stack_limits() In blk_stack_limits(), we check that the t->chunk_sectors value is a multiple of the t->physical_block_size value. However, by finding the chunk_sectors value in bytes, we may overflow the unsigned int which holds chunk_sectors, so change the check to be based on sectors.
Statement
This vulnerability is rated Low for Red Hat Enterprise Linux because a possible integer overflow in the blk_stack_limits() function within the kernel's block layer could be exploited by an attacker with high privileges. Successful exploitation may lead to a denial of service or information disclosure. Triggering this vulnerability requires elevated privileges (ex. CAP_SYS_ADMIN) as modifying or creating block stacks is a privileged operation. If the bug is triggered, then there are potentially impacts to integrity and availability, in that a misalignment could result in an incorrect write to storage which in turn could cause some I/O errors, though they are unlikely to hang the system outright.
This affects Red Hat Enterprise Linux 7, 8, 9, 10, and Red Hat In-Vehicle OS.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 3.4 | 5.5 | N/A |
| Attack Vector | Local | Local | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | High | Low | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | None | None | N/A |
| Integrity Impact | Low | None | N/A |
| Availability Impact | Low | High | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:L
NVD: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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