CVE-2026-64142Network attack vector

Kernel memory corruption via durable-handle races

Published Jul 19, 2026 · Updated Jul 19, 2026

Use-after-free in ksmbd in the Linux Kernel allows remote attackers to corrupt kernel memory via concurrent SMB2 durable-handle requests. ksmbd_durable_scavenger reuses fp->node across two lists and frees expired handles after dropping global_ft.lock while m_fp_list walkers can still hold references. Network reachability to a ksmbd SMB share with durable handles enabled is required; concurrent expiration and rename or create requests enable kernel reads, writes, or a panic.

CVSS severity9.8
Critical
EPSS probability0.53%
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 ksmbd in the Linux Kernel allows remote attackers to corrupt kernel memory via concurrent SMB2 durable-handle requests. ksmbd_durable_scavenger reuses fp->node across two lists and frees expired handles after dropping global_ft.lock while m_fp_list walkers can still hold references. Network reachability to a ksmbd SMB share with durable handles enabled is required; concurrent expiration and rename or create requests enable kernel reads, writes, or a panic.

The record

CVE
CVE-2026-64142
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=6.11
  2. Affected versionversion=7f0cb478703cbeaddfe5c9101c5c73cd975d1073 <3a436932eb397e909d0607d76a8325abd9d85a35
  3. Affected versionversion=d484d621d40f4a8b8959008802d79bef3609641b <1f8f3246d55f89350a1a67bdf3744b7241048e4e
  4. Affected versionversion=d484d621d40f4a8b8959008802d79bef3609641b <5da69a65b282d2276de22e5194ba0f88c836170c
  5. Affected versionversion=d484d621d40f4a8b8959008802d79bef3609641b <95f072ef934ca00711d510676b8792cbf59a5aae
  6. Affected versionversion=d484d621d40f4a8b8959008802d79bef3609641b <bf736184d063da1a552ffeff0481813599a182cc

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.11; version=7f0cb478703cbeaddfe5c9101c5c73cd975d1073 <3a436932eb397e909d0607d76a8325abd9d85a35; version=d484d621d40f4a8b8959008802d79bef3609641b <1f8f3246d55f89350a1a67bdf3744b7241048e4e; version=d484d621d40f4a8b8959008802d79bef3609641b <5da69a65b282d2276de22e5194ba0f88c836170c; version=d484d621d40f4a8b8959008802d79bef3609641b <95f072ef934ca00711d510676b8792cbf59a5aae; version=d484d621d40f4a8b8959008802d79bef3609641b <bf736184d063da1a552ffeff0481813599a182cc

Published CVSS scores

9.8Linux kernel.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

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1499.004Endpoint Denial of Service: Application 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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