CVE-2025-39742

RDMA: hfi1: fix possible divide-by-zero in find_hw_thread_mask()

State: Published
Severity: Not scored
Published: Sep 11, 2025
Updated: May 12, 2026
Reserved: Apr 16, 2025

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	b094a36f90975373c3a241839869217a65f17d81 to before 9bba1a9994c523b44db64f63b564b4719ea2b7efAffected b094a36f90975373c3a241839869217a65f17d81 to before 1a7cf828ed861de5be1aff99e10f114b363c19d3Affected b094a36f90975373c3a241839869217a65f17d81 to before 9d3211cb61a0773a2440d0a0698c1e6e7429f907Affected b094a36f90975373c3a241839869217a65f17d81 to before 4b4317b0d758ff92ba96f4e448a8992a6fe607bfAffected b094a36f90975373c3a241839869217a65f17d81 to before 89fdac333a17ed990b41565630ef4791782e02f5Affected b094a36f90975373c3a241839869217a65f17d81 to before 9b05e91afe948ed819bf87d7ba0fccf451ed79a6Affected b094a36f90975373c3a241839869217a65f17d81 to before 31d0599a23efdbfe579bfbd1eb8f8c942f13744dAffected b094a36f90975373c3a241839869217a65f17d81 to before ac53f377393cc85156afdc90b636e84e544a6f96Affected b094a36f90975373c3a241839869217a65f17d81 to before 59f7d2138591ef8f0e4e4ab5f1ab674e8181ad3aAffected
LinuxLinux	4.8Affected before 4.8Not affected 5.4.297 through 5.4.Not affected 5.10.241 through 5.10.Not affected 5.15.190 through 5.15.Not affected 6.1.149 through 6.1.Not affected 6.6.103 through 6.6.Not affected 6.12.43 through 6.12.Not affected 6.15.11 through 6.15.Not affected 6.16.2 through 6.16.Not affected 6.17 and laterNot affected

Product

Versions

LinuxLinux

b094a36f90975373c3a241839869217a65f17d81 to before 9bba1a9994c523b44db64f63b564b4719ea2b7efAffected
b094a36f90975373c3a241839869217a65f17d81 to before 1a7cf828ed861de5be1aff99e10f114b363c19d3Affected
b094a36f90975373c3a241839869217a65f17d81 to before 9d3211cb61a0773a2440d0a0698c1e6e7429f907Affected
b094a36f90975373c3a241839869217a65f17d81 to before 4b4317b0d758ff92ba96f4e448a8992a6fe607bfAffected
b094a36f90975373c3a241839869217a65f17d81 to before 89fdac333a17ed990b41565630ef4791782e02f5Affected
b094a36f90975373c3a241839869217a65f17d81 to before 9b05e91afe948ed819bf87d7ba0fccf451ed79a6Affected
b094a36f90975373c3a241839869217a65f17d81 to before 31d0599a23efdbfe579bfbd1eb8f8c942f13744dAffected
b094a36f90975373c3a241839869217a65f17d81 to before ac53f377393cc85156afdc90b636e84e544a6f96Affected
b094a36f90975373c3a241839869217a65f17d81 to before 59f7d2138591ef8f0e4e4ab5f1ab674e8181ad3aAffected

LinuxLinux

4.8Affected
before 4.8Not affected
5.4.297 through 5.4.*Not affected
5.10.241 through 5.10.*Not affected
5.15.190 through 5.15.*Not affected
6.1.149 through 6.1.*Not affected
6.6.103 through 6.6.*Not affected
6.12.43 through 6.12.*Not affected
6.15.11 through 6.15.*Not affected
6.16.2 through 6.16.*Not affected
6.17 and laterNot affected

References

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