CVE-2025-39795
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-09-12

Last updated on: 2025-11-03

Assigner: kernel.org

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.
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Meta Information
Published
2025-09-12
Last Modified
2025-11-03
Generated
2026-06-16
AI Q&A
2025-09-12
EPSS Evaluated
2026-06-15
NVD
CVE-2025-39795
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
linux linux_kernel 5.10.244
linux linux_kernel 6.1.153
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability in the Linux kernel involves a potential overflow in the blk_stack_limits() function when checking the chunk_sectors value. The function checks if chunk_sectors is a multiple of physical_block_size, but calculating chunk_sectors in bytes can cause an overflow of the unsigned int variable holding it. The fix changes the check to be based on sectors to avoid this overflow.

Impact Analysis

If exploited, this overflow could lead to incorrect validation of block device parameters, potentially causing unexpected behavior or system instability in the Linux kernel's block layer. This might affect data integrity or system reliability.

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