Vulnerability 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 Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 4.8, < 5.4.297 |
| Debian | Debian Linux | 11.0 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/1a7cf828ed861de5be1aff99e10f114b363c19d3Patch
- https://git.kernel.org/stable/c/31d0599a23efdbfe579bfbd1eb8f8c942f13744dPatch
- https://git.kernel.org/stable/c/4b4317b0d758ff92ba96f4e448a8992a6fe607bfPatch
- https://git.kernel.org/stable/c/59f7d2138591ef8f0e4e4ab5f1ab674e8181ad3aPatch
- https://git.kernel.org/stable/c/89fdac333a17ed990b41565630ef4791782e02f5Patch
- https://git.kernel.org/stable/c/9b05e91afe948ed819bf87d7ba0fccf451ed79a6Patch
- https://git.kernel.org/stable/c/9bba1a9994c523b44db64f63b564b4719ea2b7efPatch
- https://git.kernel.org/stable/c/9d3211cb61a0773a2440d0a0698c1e6e7429f907Patch
- https://git.kernel.org/stable/c/ac53f377393cc85156afdc90b636e84e544a6f96Patch
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.htmlMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlMailing ListThird Party Advisory
- https://cert-portal.siemens.com/productcert/html/ssa-032379.html
FAQ
What is CVE-2025-39742?
CVE-2025-39742 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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, ...
How severe is CVE-2025-39742?
CVE-2025-39742 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-39742?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel, Debian Debian Linux.