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    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.

    Published:Sep 11, 2025
    Last Modified:May 12, 2026
    EPS:Sep 11, 2025
    EPSS Score:0.00016
    CVSS Score:5.5

    Affected Products

    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Linux
    Product
    Linux Kernel

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-369 Divide By Zero

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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    References

    https://git.kernel.org/stable/c/1a7cf828ed861de5be1aff99e10f114b363c19d3
    https://git.kernel.org/stable/c/31d0599a23efdbfe579bfbd1eb8f8c942f13744d
    https://git.kernel.org/stable/c/4b4317b0d758ff92ba96f4e448a8992a6fe607bf
    https://git.kernel.org/stable/c/59f7d2138591ef8f0e4e4ab5f1ab674e8181ad3a
    https://git.kernel.org/stable/c/89fdac333a17ed990b41565630ef4791782e02f5
    https://git.kernel.org/stable/c/9b05e91afe948ed819bf87d7ba0fccf451ed79a6
    https://git.kernel.org/stable/c/9bba1a9994c523b44db64f63b564b4719ea2b7ef
    https://git.kernel.org/stable/c/9d3211cb61a0773a2440d0a0698c1e6e7429f907
    https://git.kernel.org/stable/c/ac53f377393cc85156afdc90b636e84e544a6f96
    https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
    https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
    https://cert-portal.siemens.com/productcert/html/ssa-032379.html

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High