Vulnerability in Linux

CVE-2025-39720

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix refcount leak causing resource not released When ksmbd_conn_releasing(opinfo->conn) returns true,the refcount was not decremented properly, causing a refcount leak that prevents the count from reaching zero and the memory from being released.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.003 (19.2th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 19.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2025-39720: held from 0.003 to 0.003.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000

Affected products

  • Linux — versions 0626e6641f6b467447c81dd7678a69c66f7746cf, 5.15, 0
  • Linux Kernel — versions 6.17

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2025-39720?
CVE-2025-39720 is a high-severity vulnerability in Linux. CVSS score: 7.5/10. Published 2025-09-05.
How severe is CVE-2025-39720?
High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2025-39720 known to be exploited?
2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.