CVE-2026-53167Public exploit

Local memory disclosure via unchecked FUSE folios

Published Jun 25, 2026 · Updated Jun 25, 2026

Uninitialized memory disclosure in the Linux Kernel FUSE subsystem allows local users to read freed page data through a FUSE mount. fuse_retrieve() copies a non-uptodate page-cache folio to a FUSE daemon without first verifying that the folio contains initialized data. Exploitation requires local FUSE and user-namespace access and a system without allocation zeroing; it discloses one page of stale kernel memory.

CVSS severity5.5
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uninitialized memory disclosure in the Linux Kernel FUSE subsystem allows local users to read freed page data through a FUSE mount. fuse_retrieve() copies a non-uptodate page-cache folio to a FUSE daemon without first verifying that the folio contains initialized data. Exploitation requires local FUSE and user-namespace access and a system without allocation zeroing; it discloses one page of stale kernel memory.

The record

CVE
CVE-2026-53167
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-908, T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 25, 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=2.6.36
  2. Affected versionversion=2d45ba381a74a743eeaa2b06c7c5c0d2bf73ba1a <1fb8735a3a4d894f8c1f90b741a3ab1d3817f9bd
  3. Affected versionversion=2d45ba381a74a743eeaa2b06c7c5c0d2bf73ba1a <4e3d1b2c48ca6c55f1e9ca7f8dccc76f120f276c
  4. Affected versionversion=2d45ba381a74a743eeaa2b06c7c5c0d2bf73ba1a <56763afa013444a9d84ca1b74e4b7130942177ba

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2.6.36; version=2d45ba381a74a743eeaa2b06c7c5c0d2bf73ba1a <1fb8735a3a4d894f8c1f90b741a3ab1d3817f9bd; version=2d45ba381a74a743eeaa2b06c7c5c0d2bf73ba1a <4e3d1b2c48ca6c55f1e9ca7f8dccc76f120f276c; version=2d45ba381a74a743eeaa2b06c7c5c0d2bf73ba1a <56763afa013444a9d84ca1b74e4b7130942177ba

Published CVSS scores

5.5NIST NVDCVSS: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.

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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-908Use of Uninitialized Resource
T1005Data from Local System

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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