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🛡️ CVE-2025-39933 — kernel

🔴 CVSS 9.4 — Critical ✅ No Known Exploit NVD
9.4
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

smb: client: let recv_done verify data_offset, data_length and remaining_data_length

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity low, availability high.

Affected software

CVE-2025-39933 is recorded against 2 packages.

  • kernel (from 4.16.0 up to 6.16.9)
  • linux-kernel

Timeline and source

Published on 4 October 2025 and last revised on 12 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2025-39933 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Critical
CVSS Score 9.4
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2025-10-04
Updated 2026-08-20
Modified 2026-08-12

Affected Packages

Software From version Fixed in
kernel 4.16.0 6.16.9
linux-kernel — —

Similar Threats

Exploit Protection

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CVE-2025-39933 carries CVSS 9.4 Critical rating. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.