CVE-2026-98115

8.8 HIGH

Published 2026-09-25 · Updated 2026-09-25

AI risk analysis

Summary: This flaw allows an attacker to exploit SMB3 multichannel to keep byte-range locks running and prevent session objects from being freed, leading to potential system instability or data corruption.
Exploitability: Exploitation requires control over SMB3 sessions and understanding of byte-range lock mechanics. Precondition is the presence of SMB3 multichannel enabled.
Blast radius: If exploited, this could lead to system crashes, data corruption, or denial of service for affected systems.
Detection: No reliable host or network indicator is derivable from the published description.
Prioritized remediation: Upgrade to the latest stable kernel version, specifically addressing the ksmbd vulnerability, or disable SMB3 multichannel if it is not required.

smbkernellockmultichannel

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.

NVD description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: safely drain sessions during logoff SMB3 multichannel allows requests for one session to run on multiple connections. Wait for all channels bound to a session before freeing shared session objects. A deferred byte-range lock remains counted as a running request and only wakes when its file closes. Wake blocked locks during the drain without unpublishing or modifying their file objects. Synchronous CANCEL requests must invoke their cancellation callback to wake pending operations, while CHANGE_NOTIFY completion remains specific to the asynchronous path. Serialize session teardown with channel registration and previous-session cleanup, and use atomic work-state transitions so LOGOFF, CANCEL, and connection teardown invoke cancellation callbacks only once.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

All references

Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.

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