CVE-2025-39742RDMA: hfi1: fix possible divide-by-zero in find_hw_thread_mask()
- 5.5MediumCVSS base score
- 0.18%Exploitation in 30 daysEPSS · top 92% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
- 5 months later
· 5 months later
Published
- 8 months later
· 8 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.18% · top 92% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected b094a36f90975373c3a241839869217a65f17d81 – < 9bba1a9994c523b44db64f63b564b4719ea2b7ef
- affected b094a36f90975373c3a241839869217a65f17d81 – < 1a7cf828ed861de5be1aff99e10f114b363c19d3
- affected b094a36f90975373c3a241839869217a65f17d81 – < 9d3211cb61a0773a2440d0a0698c1e6e7429f907
- affected b094a36f90975373c3a241839869217a65f17d81 – < 4b4317b0d758ff92ba96f4e448a8992a6fe607bf
- affected b094a36f90975373c3a241839869217a65f17d81 – < 89fdac333a17ed990b41565630ef4791782e02f5
- affected b094a36f90975373c3a241839869217a65f17d81 – < 9b05e91afe948ed819bf87d7ba0fccf451ed79a6
- affected b094a36f90975373c3a241839869217a65f17d81 – < 31d0599a23efdbfe579bfbd1eb8f8c942f13744d
- affected b094a36f90975373c3a241839869217a65f17d81 – < ac53f377393cc85156afdc90b636e84e544a6f96
- affected b094a36f90975373c3a241839869217a65f17d81 – < 59f7d2138591ef8f0e4e4ab5f1ab674e8181ad3a
- affected 4.8
- unaffected < 4.8
- unaffected 5.4.297 – ≤ 5.4.*
- unaffected 5.10.241 – ≤ 5.10.*
- unaffected 5.15.190 – ≤ 5.15.*
- unaffected 6.1.149 – ≤ 6.1.*
- unaffected 6.6.103 – ≤ 6.6.*
- unaffected 6.12.43 – ≤ 6.12.*
- unaffected 6.15.11 – ≤ 6.15.*
- unaffected 6.16.2 – ≤ 6.16.*
- unaffected 6.17 – ≤ *
References
References12
- https://git.kernel.org/stable/c/9bba1a9994c523b44db64f63b564b4719ea2b7ef (opens in a new tab)
- https://git.kernel.org/stable/c/1a7cf828ed861de5be1aff99e10f114b363c19d3 (opens in a new tab)
- https://git.kernel.org/stable/c/9d3211cb61a0773a2440d0a0698c1e6e7429f907 (opens in a new tab)
- https://git.kernel.org/stable/c/4b4317b0d758ff92ba96f4e448a8992a6fe607bf (opens in a new tab)
- https://git.kernel.org/stable/c/89fdac333a17ed990b41565630ef4791782e02f5 (opens in a new tab)
- https://git.kernel.org/stable/c/9b05e91afe948ed819bf87d7ba0fccf451ed79a6 (opens in a new tab)
- https://git.kernel.org/stable/c/31d0599a23efdbfe579bfbd1eb8f8c942f13744d (opens in a new tab)
- https://git.kernel.org/stable/c/ac53f377393cc85156afdc90b636e84e544a6f96 (opens in a new tab)
- https://git.kernel.org/stable/c/59f7d2138591ef8f0e4e4ab5f1ab674e8181ad3a (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-032379.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-28969 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-39742)Record last updated .