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Vulnerabilities

Vulnerability · 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 rel

Published Oct 4, 2025 · catalog updated Oct 21, 2026 · Linux Linux

Check if you run it

No confirmed exploitation is on record for CVE-2025-39933. EPSS is 0.26%. Act only if a listed version of Linux Linux is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.4
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.26%
Remediation
Version ranges on file
Affected products
cpe linux/linux kernel · vendor Linux Linux f198186aa9bbd60fae7a2061f4feec614d880299 <f57e53ea252363234f86674db475839e5b87102e

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe linux/linux kernel6.17
  • cpe linux/linux kernel< 6.16.9
  • vendor Linux Linux f198186aa9bbd60fae7a2061f4feec614d880299 <f57e53ea252363234f86674db475839e5b87102ef198186aa9bbd60fae7a2061f4feec614d880299 <f57e53ea252363234f86674db475839e5b87102e

How to fix CVE-2025-39933

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-39933. EPSS is 0.26%. Act only if a listed version of Linux Linux is installed.

Which versions are affected?

Compare what you have installed with linux/linux kernel 6.17; linux/linux kernel < 6.16.9; Linux Linux f198186aa9bbd60fae7a2061f4feec614d880299 <f57e53ea252363234f86674db475839e5b87102e f198186aa9bbd60fae7a2061f4feec614d880299 <f57e53ea252363234f86674db475839e5b87102e. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.26%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 4, 2025 · NIST NVD

    Detected

    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.

  2. Oct 21, 2026 · NIST NVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2025-39933

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-39933

    30-day exploitation probability 0.26%

    first.org
  • EUVDVulnerability recordEUVD-2025-32405

    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.

    euvd.enisa.europa.eu
  • NIST NVDVulnerability recordCVE-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.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 23, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.