CVE-2026-7162Public exploit

SYSTEM escalation via truncated notification allocation

Published Jul 13, 2026 · Updated Jul 13, 2026

Integer overflow in the kernel driver in WinFsp 2.2.26112 and earlier allows local users to elevate privileges to SYSTEM. FspVolumeNotify performs a 32-bit allocation-size addition with an attacker-controlled InputBufferLength, then copies that full length into the undersized NonPagedPool buffer. Any local process that opens the world-readable control device and creates a volume can corrupt adjacent pool memory and replace its process token.

CVSS severity7.8
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in the kernel driver in WinFsp 2.2.26112 and earlier allows local users to elevate privileges to SYSTEM. FspVolumeNotify performs a 32-bit allocation-size addition with an attacker-controlled InputBufferLength, then copies that full length into the undersized NonPagedPool buffer. Any local process that opens the world-readable control device and creates a volume can corrupt adjacent pool memory and replace its process token.

The record

CVE
CVE-2026-7162
Published
Jul 13, 2026
Updated
Jul 13, 2026
Vendor
WinFsp
Product
WinFsp
Classifications
CWE-190, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 13, 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=2.2.26112 and lower

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

WinFsp · WinFspversion=2.2.26112 and lower

Published CVSS scores

7.8CSACVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/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.

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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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
T1068Exploitation for Privilege Escalation

Public exploit references

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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