CVE-2026-68381Network attack vector

Kernel crash via asynchronous connection use-after-free

Published Aug 10, 2026 · Updated Aug 10, 2026

Use-after-free in Linux ksmbd 6.6.84 through 6.6.147 allows remote attackers to crash the kernel through an SMB race. Asynchronous oplock and lease-break work retains a ksmbd_conn pointer without taking an object reference, so teardown can free it before worker access. An SMB client connection must race teardown with a break notification; affected releases also include 6.12.20 through 6.12.100 and selected branches beginning with 6.14.

CVSS severity9.8
Critical
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux ksmbd 6.6.84 through 6.6.147 allows remote attackers to crash the kernel through an SMB race. Asynchronous oplock and lease-break work retains a ksmbd_conn pointer without taking an object reference, so teardown can free it before worker access. An SMB client connection must race teardown with a break notification; affected releases also include 6.12.20 through 6.12.100 and selected branches beginning with 6.14.

The record

CVE
CVE-2026-68381
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-364, T1499.004
Attack vector
network
Privileges
unauthenticated

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=09aeab68033161cb54f194da93e51a11aee6144b <0f72fc9659d7f585460d43c158055df5afdcffb6
  2. Affected versionversion=3aa660c059240e0c795217182cf7df32909dd917 <14062c74e5b25c27edcff7a2fe0dc701c930b372
  3. Affected versionversion=3aa660c059240e0c795217182cf7df32909dd917 <6ecb252efa0b413ac3d9979fb4eec247f8fc1258
  4. Affected versionversion=3aa660c059240e0c795217182cf7df32909dd917 <aa5d8f3f96aa11a4a54ce993c11ce8af11c546f9
  5. Affected versionversion=6.12.20 <6.12.101
  6. Affected versionversion=6.13.8 <6.14
  7. Affected versionversion=6.14
  8. Affected versionversion=6.6.84 <6.6.148
  9. Affected versionversion=a4261bbc33fbf99b99c80aa3a2c5097611802980 <793e1c7041b93af96ff87e678329bc16aee7ba88
  10. Affected versionversion=f17d1c63a76b0fe8e9c78023a86507a3a6d62cfa

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=09aeab68033161cb54f194da93e51a11aee6144b <0f72fc9659d7f585460d43c158055df5afdcffb6; version=3aa660c059240e0c795217182cf7df32909dd917 <14062c74e5b25c27edcff7a2fe0dc701c930b372; version=3aa660c059240e0c795217182cf7df32909dd917 <6ecb252efa0b413ac3d9979fb4eec247f8fc1258; version=3aa660c059240e0c795217182cf7df32909dd917 <aa5d8f3f96aa11a4a54ce993c11ce8af11c546f9; version=6.12.20 <6.12.101; version=6.13.8 <6.14; version=6.14; version=6.6.84 <6.6.148; version=a4261bbc33fbf99b99c80aa3a2c5097611802980 <793e1c7041b93af96ff87e678329bc16aee7ba88; version=f17d1c63a76b0fe8e9c78023a86507a3a6d62cfa

Published CVSS scores

7.0Red HatCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
6.4Amazon LinuxCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H
9.8CVE.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-364Signal Handler Race Condition
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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