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.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity High

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00043.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Linux
  • Linux Kernel

No data.

No data.

OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

Vendors Products
Linux
  • Linux Kernel
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://git.kernel.org/stable/c/1a7cf828ed861de5be1aff99e10f114b363c19d3 cve-icon cve-icon
https://git.kernel.org/stable/c/31d0599a23efdbfe579bfbd1eb8f8c942f13744d cve-icon cve-icon
https://git.kernel.org/stable/c/4b4317b0d758ff92ba96f4e448a8992a6fe607bf cve-icon cve-icon
https://git.kernel.org/stable/c/59f7d2138591ef8f0e4e4ab5f1ab674e8181ad3a cve-icon cve-icon
https://git.kernel.org/stable/c/89fdac333a17ed990b41565630ef4791782e02f5 cve-icon cve-icon
https://git.kernel.org/stable/c/9b05e91afe948ed819bf87d7ba0fccf451ed79a6 cve-icon cve-icon
https://git.kernel.org/stable/c/9bba1a9994c523b44db64f63b564b4719ea2b7ef cve-icon cve-icon
https://git.kernel.org/stable/c/9d3211cb61a0773a2440d0a0698c1e6e7429f907 cve-icon cve-icon
https://git.kernel.org/stable/c/ac53f377393cc85156afdc90b636e84e544a6f96 cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2025091139-CVE-2025-39742-37e8@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-39742 cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-39742 cve-icon
History

Fri, 12 Sep 2025 08:15:00 +0000

Type Values Removed Values Added
First Time appeared Linux
Linux linux Kernel
Vendors & Products Linux
Linux linux Kernel

Fri, 12 Sep 2025 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 7.0, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'}

threat_severity

Important

Thu, 11 Sep 2025 17:00:00 +0000

Type Values Removed Values 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.
Title RDMA: hfi1: fix possible divide-by-zero in find_hw_thread_mask()
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2025-09-29T05:58:29.559Z

Reserved: 2025-04-16T07:20:57.120Z

Link: CVE-2025-39742

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-09-11T17:15:36.733

Modified: 2025-09-15T15:22:38.297

Link: CVE-2025-39742

cve-icon Redhat

Severity : Important

Publid Date: 2025-09-11T00:00:00Z

Links: CVE-2025-39742 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2025-09-12T08:02:39Z