CVE-2026-68130Network attack vector

Authenticated SMB session termination via pre-validation destruction

Published Aug 10, 2026 · Updated Aug 10, 2026

Denial of service in Linux kernel ksmbd allows remote authenticated users to terminate another user's active SMB session. The ntlm_authenticate() path calls destroy_previous_session() with a username and PreviousSessionId taken from the NTLM blob before validating the NTLMv2 response. An existing authenticated ksmbd connection and NTLM authentication are required; the result is interruption of the selected victim's SMB session rather than a server crash.

CVSS severity5.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Linux kernel ksmbd allows remote authenticated users to terminate another user's active SMB session. The ntlm_authenticate() path calls destroy_previous_session() with a username and PreviousSessionId taken from the NTLM blob before validating the NTLMv2 response. An existing authenticated ksmbd connection and NTLM authentication are required; the result is interruption of the selected victim's SMB session rather than a server crash.

The record

CVE
CVE-2026-68130
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-408, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.15
  2. Affected versionversion=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <0ff12308c8a6c16ab68f0a487ffa93d69001dc18
  3. Affected versionversion=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <18705cace0619fd2123737dcd028147774f38181
  4. Affected versionversion=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <243f1614ef2aca2d62a744575f1c24b07cd42757
  5. Affected versionversion=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <5c833074b549e5db125436a6f681af682261f785
  6. Affected versionversion=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <c74801ee524f477c174a1899782b6c3b6918d407

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.15; version=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <0ff12308c8a6c16ab68f0a487ffa93d69001dc18; version=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <18705cace0619fd2123737dcd028147774f38181; version=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <243f1614ef2aca2d62a744575f1c24b07cd42757; version=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <5c833074b549e5db125436a6f681af682261f785; version=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <c74801ee524f477c174a1899782b6c3b6918d407

Published CVSS scores

5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-408Incorrect Behavior Order: Early Amplification
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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