CVE-2026-64140Network attack vector

Kernel panic via unchecked durable-handle pointer

Published Jul 19, 2026 · Updated Jul 19, 2026

Null pointer dereference in Linux Kernel 7.0 through 7.0.10 allows remote attackers to prime a kernel panic via SMB2 durable handles. session_fd_check() clears fp->tcon during SMB2 SESSION_LOGOFF but leaves the file pointer in global_ft.idr, where proc_show_files() dereferences fp->tcon->id without a null check. Exposure also includes 7.1-rc1 through 7.1-rc4 and requires successful SMB2 SESSION_SETUP, durable handles enabled, and a privileged proc-file read during the timeout window; the panic interrupts the host.

CVSS severity7.5
High
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Null pointer dereference in Linux Kernel 7.0 through 7.0.10 allows remote attackers to prime a kernel panic via SMB2 durable handles. session_fd_check() clears fp->tcon during SMB2 SESSION_LOGOFF but leaves the file pointer in global_ft.idr, where proc_show_files() dereferences fp->tcon->id without a null check. Exposure also includes 7.1-rc1 through 7.1-rc4 and requires successful SMB2 SESSION_SETUP, durable handles enabled, and a privileged proc-file read during the timeout window; the panic interrupts the host.

The record

CVE
CVE-2026-64140
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499
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

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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=7.0
  2. Affected versionversion=b38f99c1217ae04753340f0fdcd8f35bf56841dc <8eab081627b67216d1c8f638b68289b500dc9a6b
  3. Affected versionversion=b38f99c1217ae04753340f0fdcd8f35bf56841dc <904901561e61a2b559070b20c74a8c95491f30aa

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=7.0; version=b38f99c1217ae04753340f0fdcd8f35bf56841dc <8eab081627b67216d1c8f638b68289b500dc9a6b; version=b38f99c1217ae04753340f0fdcd8f35bf56841dc <904901561e61a2b559070b20c74a8c95491f30aa

Published CVSS scores

7.5kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/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.

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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-476NULL Pointer Dereference
T1499Endpoint Denial of Service

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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