5.5

CVE-2025-39742: debian debian_linux Divide By Zero

CVSS: 5.5v3.1MediumModified
AliasesSUSE-SU-2026:0533-1SUSE-SU-2026:0544-1UBUNTU-CVE-2025-39742
Published 11-09-2025Last modified 12-05-2026
Open JSON

Vulnerability summary

CVE-2025-39742 is a medium (CVSS 5.5) Divide By Zero vulnerability in debian debian_linux. EPSS estimates a 0.18% chance of exploitation in the next 30 days, higher than 6.7% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.18%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 96 · Related 93
DLA-4327-1DLA-4328-1DSA-6009-1OPENSUSE-SU-2025:20081-1SUSE-SU-2025:03600-1SUSE-SU-2025:03634-1

Timeline

  1. 11-09-2025
    PublishedVulnerability first disclosed.
  2. 12-05-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.18%

Chance of exploitation in the next 30 days

Percentile

7%

Versus all other CVEs

30-day change

+0.01 pp

From 0.17% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.18%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu149 products
  • linuxAll versions (No fix recorded) | < 5.15.0-163.173 | < 6.8.0-100.100
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1097.104 | < 6.8.0-1046.49
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linux< 6.1.153-1 | < 6.12.43-1 | < 6.16.3-1
  • debian_linuxEOL11.0
Linux2 products
  • linux≥ b094a36f90975373c3a241839869217a65f17d81, < 9bba1a9994c523b44db64f63b564b4719ea2b7ef | ≥ b094a36f90975373c3a241839869217a65f17d81, < 1a7cf828ed861de5be1aff99e10f114b363c19d3 | ≥ b094a36f90975373c3a241839869217a65f17d81, < 9d3211cb61a0773a2440d0a0698c1e6e7429f907 | ≥ b094a36f90975373c3a241839869217a65f17d81, < 4b4317b0d758ff92ba96f4e448a8992a6fe607bf | ≥ b094a36f90975373c3a241839869217a65f17d81, < 89fdac333a17ed990b41565630ef4791782e02f5 | ≥ b094a36f90975373c3a241839869217a65f17d81, < 9b05e91afe948ed819bf87d7ba0fccf451ed79a6 | ≥ b094a36f90975373c3a241839869217a65f17d81, < 31d0599a23efdbfe579bfbd1eb8f8c942f13744d | ≥ b094a36f90975373c3a241839869217a65f17d81, < ac53f377393cc85156afdc90b636e84e544a6f96 | ≥ b094a36f90975373c3a241839869217a65f17d81, < 59f7d2138591ef8f0e4e4ab5f1ab674e8181ad3a | 4.8
  • linux_kernel≥ 4.8, < 5.4.297 | ≥ 5.5, < 5.10.241 | ≥ 5.11, < 5.15.190 | ≥ 5.16, < 6.1.149 | ≥ 6.2, < 6.6.103 | ≥ 6.7, < 6.12.43 | ≥ 6.13, < 6.15.11 | ≥ 6.16, < 6.16.2
Suse2 products
  • kernel-livepatch-SLE15-SP4_Update_45&distro=SUSE Linux Enterprise Live Patching 15 SP4< 5-150400.2.1
  • kernel-livepatch-SLE15-SP5_Update_31&distro=SUSE Linux Enterprise Live Patching 15 SP5< 4-150500.2.1

4 vendors · 155 products

References

45 links
Show all 45 references