Vulnerability in Linux

CVE-2025-39933

In the Linux kernel, the following vulnerability has been resolved: smb: client: let recv_done verify data_offset, data_length and remaining_data_length This is inspired by the related server fixes.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 9.4 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H.

EPSS exploit prediction

EPSS: 0.002 (10.2th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 10th percentile — 10.2% 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-2025-39933: held from 0.002 to 0.002.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000

Affected products

  • Linux — versions f198186aa9bbd60fae7a2061f4feec614d880299, 4.16, 0
  • Linux Kernel — versions 6.17

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2025-39933?
CVE-2025-39933 is a critical-severity vulnerability in Linux. CVSS score: 9.4/10. Published 2025-10-04.
How severe is CVE-2025-39933?
Critical severity. CVSS v3 base score is 9.4 out of 10.
Is CVE-2025-39933 known to be exploited?
1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.