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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.

PUBLISHED Reserved 2025-04-16 | Published 2025-09-11 | Updated 2026-05-12 | Assigner Linux

Product status

Default status
unaffected

b094a36f90975373c3a241839869217a65f17d81 (git) before 9bba1a9994c523b44db64f63b564b4719ea2b7ef
affected

b094a36f90975373c3a241839869217a65f17d81 (git) before 1a7cf828ed861de5be1aff99e10f114b363c19d3
affected

b094a36f90975373c3a241839869217a65f17d81 (git) before 9d3211cb61a0773a2440d0a0698c1e6e7429f907
affected

b094a36f90975373c3a241839869217a65f17d81 (git) before 4b4317b0d758ff92ba96f4e448a8992a6fe607bf
affected

b094a36f90975373c3a241839869217a65f17d81 (git) before 89fdac333a17ed990b41565630ef4791782e02f5
affected

b094a36f90975373c3a241839869217a65f17d81 (git) before 9b05e91afe948ed819bf87d7ba0fccf451ed79a6
affected

b094a36f90975373c3a241839869217a65f17d81 (git) before 31d0599a23efdbfe579bfbd1eb8f8c942f13744d
affected

b094a36f90975373c3a241839869217a65f17d81 (git) before ac53f377393cc85156afdc90b636e84e544a6f96
affected

b094a36f90975373c3a241839869217a65f17d81 (git) before 59f7d2138591ef8f0e4e4ab5f1ab674e8181ad3a
affected

Default status
affected

4.8
affected

Any version before 4.8
unaffected

5.4.297 (semver)
unaffected

5.10.241 (semver)
unaffected

5.15.190 (semver)
unaffected

6.1.149 (semver)
unaffected

6.6.103 (semver)
unaffected

6.12.43 (semver)
unaffected

6.15.11 (semver)
unaffected

6.16.2 (semver)
unaffected

6.17 (original_commit_for_fix)
unaffected

References

lists.debian.org/debian-lts-announce/2025/10/msg00008.html

lists.debian.org/debian-lts-announce/2025/10/msg00007.html

cert-portal.siemens.com/productcert/html/ssa-032379.html

git.kernel.org/...c/9bba1a9994c523b44db64f63b564b4719ea2b7ef

git.kernel.org/...c/1a7cf828ed861de5be1aff99e10f114b363c19d3

git.kernel.org/...c/9d3211cb61a0773a2440d0a0698c1e6e7429f907

git.kernel.org/...c/4b4317b0d758ff92ba96f4e448a8992a6fe607bf

git.kernel.org/...c/89fdac333a17ed990b41565630ef4791782e02f5

git.kernel.org/...c/9b05e91afe948ed819bf87d7ba0fccf451ed79a6

git.kernel.org/...c/31d0599a23efdbfe579bfbd1eb8f8c942f13744d

git.kernel.org/...c/ac53f377393cc85156afdc90b636e84e544a6f96

git.kernel.org/...c/59f7d2138591ef8f0e4e4ab5f1ab674e8181ad3a

cve.org (CVE-2025-39742)

nvd.nist.gov (CVE-2025-39742)

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