CVE-2025-39742
RDMA: hfi1: fix possible divide-by-zero in find_hw_thread_mask()
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.
INFO
Published Date :
Sept. 11, 2025, 5:15 p.m.
Last Modified :
Sept. 11, 2025, 5:15 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products
The following products are affected by CVE-2025-39742
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Update the Linux kernel.
- Apply the fix to the hfi1 driver.
- Ensure checks precede division operations.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-39742.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-39742 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-39742
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-39742 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-39742 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Sep. 11, 2025
Action Type Old Value New Value Added 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. Added Reference https://git.kernel.org/stable/c/1a7cf828ed861de5be1aff99e10f114b363c19d3 Added Reference https://git.kernel.org/stable/c/31d0599a23efdbfe579bfbd1eb8f8c942f13744d Added Reference https://git.kernel.org/stable/c/4b4317b0d758ff92ba96f4e448a8992a6fe607bf Added Reference https://git.kernel.org/stable/c/59f7d2138591ef8f0e4e4ab5f1ab674e8181ad3a Added Reference https://git.kernel.org/stable/c/89fdac333a17ed990b41565630ef4791782e02f5 Added Reference https://git.kernel.org/stable/c/9b05e91afe948ed819bf87d7ba0fccf451ed79a6 Added Reference https://git.kernel.org/stable/c/9bba1a9994c523b44db64f63b564b4719ea2b7ef Added Reference https://git.kernel.org/stable/c/9d3211cb61a0773a2440d0a0698c1e6e7429f907 Added Reference https://git.kernel.org/stable/c/ac53f377393cc85156afdc90b636e84e544a6f96