CVE-2025-39742

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 v3 5.5 MEDIUM

5.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/1a7cf828ed861de5be1aff99e10f114b363c19d3	Patch
https://git.kernel.org/stable/c/31d0599a23efdbfe579bfbd1eb8f8c942f13744d	Patch
https://git.kernel.org/stable/c/4b4317b0d758ff92ba96f4e448a8992a6fe607bf	Patch
https://git.kernel.org/stable/c/59f7d2138591ef8f0e4e4ab5f1ab674e8181ad3a	Patch
https://git.kernel.org/stable/c/89fdac333a17ed990b41565630ef4791782e02f5	Patch
https://git.kernel.org/stable/c/9b05e91afe948ed819bf87d7ba0fccf451ed79a6	Patch
https://git.kernel.org/stable/c/9bba1a9994c523b44db64f63b564b4719ea2b7ef	Patch
https://git.kernel.org/stable/c/9d3211cb61a0773a2440d0a0698c1e6e7429f907	Patch
https://git.kernel.org/stable/c/ac53f377393cc85156afdc90b636e84e544a6f96	Patch
https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html	Third Party Advisory Mailing List
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html	Third Party Advisory Mailing List

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::

Configuration 2 (hide)

cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*

History

No history.

Information

Published : 2025-09-11 17:15

Updated : 2026-01-09 19:09

NVD link : CVE-2025-39742

Mitre link : CVE-2025-39742

CVE.ORG link : CVE-2025-39742

JSON object : View

Products Affected

debian

debian_linux

linux

linux_kernel

CWE

CWE-369

Divide By Zero

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