# CVE-2025-39795

## Summary

- **CVE ID:** CVE-2025-39795
- **Severity:** MEDIUM
- **CVSS Score:** 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
- **CWE:** N/A
- **Published:** Sep 12, 2025
- **Last Modified:** Sep 8, 2026

## Description

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.

## Affected Products

- Linux — Linux (22ada802ede89829dd010a317d9b812b7df7111a)
- Linux — Linux (5.10)
- Linux — Linux (0)
- Linux — Linux (5.10.241)
- Linux — Linux (5.15.190)
- Linux — Linux (6.1.149)
- Linux — Linux (6.6.103)
- Linux — Linux (6.12.43)
- Linux — Linux (6.15.11)
- Linux — Linux (6.16.2)
- Linux — Linux (6.17)

## References

- [CNA](https://git.kernel.org/stable/c/418751910044649baa2b424ea31cce3fc4dcc253)
- [CNA](https://git.kernel.org/stable/c/8b3ce085b52e674290cbfdd07034e7653ffbe4dc)
- [CNA](https://git.kernel.org/stable/c/31f2f080898e50cbf2bae62d35f9f2a997547b38)
- [CNA](https://git.kernel.org/stable/c/3b9d69f0e68aa6b0acd9791c45d445154a8c66e9)
- [CNA](https://git.kernel.org/stable/c/46aa80ef49594ed7de685ecbc673b291e9a2c159)
- [CNA](https://git.kernel.org/stable/c/5e276e6ff9aacf8901b9c3265c3cdd2568c9fff2)
- [CNA](https://git.kernel.org/stable/c/14beeef4aafecc8a41de534e31fb5be94739392f)
- [CNA](https://git.kernel.org/stable/c/448dfecc7ff807822ecd47a5c052acedca7d09e8)
- [CVE](https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html)
- [CVE](https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html)
- [siemens-SADP](https://cert-portal.siemens.com/productcert/html/ssa-082556.html)
- [siemens-SADP](https://cert-portal.siemens.com/productcert/html/ssa-032379.html)
- [siemens-SADP](https://cert-portal.siemens.com/productcert/html/ssa-019113.html)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.17%
- **EPSS Percentile:** 6.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._