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.

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.

EPSS: 0.001 (2.1th percentile) — read the EPSS interpretation.

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.

Affected products

Linux — versions f198186aa9bbd60fae7a2061f4feec614d880299, 4.16, 0
Linux Linux_kernel — versions 6.17

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)

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.