Critical 9.4Published Oct 4, 2025

CVE-2025-39933smb: client: let recv_done verify data_offset, data_length and remaining_data_length

Updated under an hour ago (Oct 27, 2026, 5:50 PM ET)

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It affects Linux and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 9.4 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 21, 2026
First seen by InfoSec Signals: Oct 19, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from f198186aa9bbd60fae7a2061f4feec614d880299 before f23d5c6b7540ec9b1e73a8ea3b2ae9045248d728; from f198186aa9bbd60fae7a2061f4feec614d880299 before 241e58de23e7c1bbb9bee526c17d9a0f2a90fbad; from f198186aa9bbd60fae7a2061f4feec614d880299 before 581fb78e0388b78911b0c920e4073737090c8b5f; from f198186aa9bbd60fae7a2061f4feec614d880299 before f57e53ea252363234f86674db475839e5b87102e	CNA record
linux linux_kernel linux:linux_kernel	from 4.16 before 6.16.9; 6.17; 6.17; 6.17; 6.17; 6.17; 6.17	NVD

References

References

https://git.kernel.org/stable/c/f23d5c6b7540ec9b1e73a8ea3b2ae9045248d728
https://git.kernel.org/stable/c/241e58de23e7c1bbb9bee526c17d9a0f2a90fbad
https://git.kernel.org/stable/c/581fb78e0388b78911b0c920e4073737090c8b5f	patch
https://git.kernel.org/stable/c/f57e53ea252363234f86674db475839e5b87102e	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.