What is CVE-2025-39942?

CVE-2025-39942 is a high-severity vulnerability in Linux. CVSS score: 7.5/10. Published 2025-10-04.

How severe is CVE-2025-39942?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2025-39942 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Linux

CVE-2025-39942

In the Linux kernel, the following vulnerability has been resolved: ksmbd: smbdirect: verify remaining_data_length respects max_fragmented_recv_size This is inspired by the check for data_offset + data_length.

EPSS: 0.003 (18.3th percentile) — read the EPSS interpretation.

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.

Affected products

Linux — versions 2ea086e35c3d726a3bacd0a971c1f02a50e98206, 5.15, 0
Linux Linux_kernel — versions 5.15, 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)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)

Frequently asked questions

What is CVE-2025-39942?: CVE-2025-39942 is a high-severity vulnerability in Linux. CVSS score: 7.5/10. Published 2025-10-04.
How severe is CVE-2025-39942?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2025-39942 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.