CVE-2025-39742
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-09-11

Last updated on: 2025-11-03

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: RDMA: hfi1: fix possible divide-by-zero in find_hw_thread_mask() The function divides number of online CPUs by num_core_siblings, and later checks the divider by zero. This implies a possibility to get and divide-by-zero runtime error. Fix it by moving the check prior to division. This also helps to save one indentation level.
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Meta Information
Published
2025-09-11
Last Modified
2025-11-03
Generated
2026-06-16
AI Q&A
2025-09-11
EPSS Evaluated
2026-06-15
NVD
CVE-2025-39742
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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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability is a possible divide-by-zero error in the Linux kernel's RDMA hfi1 driver. Specifically, the function find_hw_thread_mask() divides the number of online CPUs by num_core_siblings without first ensuring that num_core_siblings is not zero. This can lead to a runtime divide-by-zero error. The fix involved moving the zero-check before the division to prevent this error.

Impact Analysis

The divide-by-zero vulnerability can cause a runtime error in the Linux kernel, potentially leading to system instability or crashes when the affected function is executed. This could impact system reliability and availability.

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