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.
CVSS Scores
EPSS Scores
Probability:
Percentile:
Meta Information
Published
2025-09-11
Last Modified
2025-11-03
Generated
2026-05-07
AI Q&A
2025-09-11
EPSS Evaluated
2026-05-05
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
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-UNKNOWN
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?

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.


How can this vulnerability impact me? :

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.


Ask Our AI Assistant
Need more information? Ask your question to get an AI reply (Powered by our expertise)
0/70
EPSS Chart