High 7.1Published Oct 29, 2025

CVE-2025-40084ksmbd: transport_ipc: validate payload size before reading handle

Updated under an hour ago (Oct 27, 2026, 9:20 AM ET)

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: ksmbd: transport_ipc: validate payload size before reading handle handle_response() dereferences the payload as a 4-byte handle without verifying that the declared payload size is at least 4 bytes. A malformed or truncated message from ksmbd.mountd can lead to a 4-byte read past the declared payload size. Validate the size before dereferencing. This is a minimal fix to guard the initial handle read.

CVSS: 7.1 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/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: Deferred
Record last updated: Aug 5, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 0626e6641f6b467447c81dd7678a69c66f7746cf before a02e432d5130da4c723aabe1205bac805889fdb2; 0626e6641f6b467447c81dd7678a69c66f7746cf builds before 2dc125f5da134c0915a840b62565c60a595673dd; from 0626e6641f6b467447c81dd7678a69c66f7746cf before 898d527ed94c19980a4d848f10057f1fed578ffb; from 0626e6641f6b467447c81dd7678a69c66f7746cf before 867ffd9d67285612da3f0498ca618297f8e41f01; 0626e6641f6b467447c81dd7678a69c66f7746cf builds before 6f40e50ceb99fc8ef37e5c56e2ec1d162733fef0	CNA record

References

References

https://git.kernel.org/stable/c/a02e432d5130da4c723aabe1205bac805889fdb2
https://git.kernel.org/stable/c/2dc125f5da134c0915a840b62565c60a595673dd
https://git.kernel.org/stable/c/898d527ed94c19980a4d848f10057f1fed578ffb
https://git.kernel.org/stable/c/867ffd9d67285612da3f0498ca618297f8e41f01
https://git.kernel.org/stable/c/6f40e50ceb99fc8ef37e5c56e2ec1d162733fef0

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.