CVE-2024-44947

Local information disclosure via uninitialized FUSE pages

Published Sep 2, 2024 · Updated May 11, 2026

Information disclosure in the Linux FUSE subsystem allows local users to read uninitialized kernel page contents through mmap. fuse_notify_store() can mark a partially updated page uptodate without first zeroing the portion beyond end-of-file, so a later mapping exposes stale memory. Exposure requires FUSE notification storage on a system where init-on-alloc is disabled; the reported consequence is local data disclosure only.

CVSS severity5.5
Medium
EPSS probability0.89%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in the Linux FUSE subsystem allows local users to read uninitialized kernel page contents through mmap. fuse_notify_store() can mark a partially updated page uptodate without first zeroing the portion beyond end-of-file, so a later mapping exposes stale memory. Exposure requires FUSE notification storage on a system where init-on-alloc is disabled; the reported consequence is local data disclosure only.

The record

CVE
CVE-2024-44947
Published
Sep 2, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-402, T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 2, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=a1d75f258230b75d46aecdf28b2e732413028863 <18a067240817bee8a9360539af5d79a4bf5398a5
  3. Affected versionversion=a1d75f258230b75d46aecdf28b2e732413028863 <33168db352c7b56ae18aa55c2cae1a1c5905d30e
  4. Affected versionversion=a1d75f258230b75d46aecdf28b2e732413028863 <3c0da3d163eb32f1f91891efaade027fa9b245b9
  5. Affected versionversion=a1d75f258230b75d46aecdf28b2e732413028863 <4690e2171f651e2b415e3941ce17f2f7b813aff6
  6. Affected versionversion=a1d75f258230b75d46aecdf28b2e732413028863 <49934861514d36d0995be8e81bb3312a499d8d9a
  7. Affected versionversion=a1d75f258230b75d46aecdf28b2e732413028863 <831433527773e665bdb635ab5783d0b95d1246f4
  8. Affected versionversion=a1d75f258230b75d46aecdf28b2e732413028863 <8c78303eafbf85a728dd84d1750e89240c677dd9
  9. Affected versionversion=a1d75f258230b75d46aecdf28b2e732413028863 <ac42e0f0eb66af966015ee33fd355bc6f5d80cd6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.36; version=a1d75f258230b75d46aecdf28b2e732413028863 <18a067240817bee8a9360539af5d79a4bf5398a5; version=a1d75f258230b75d46aecdf28b2e732413028863 <33168db352c7b56ae18aa55c2cae1a1c5905d30e; version=a1d75f258230b75d46aecdf28b2e732413028863 <3c0da3d163eb32f1f91891efaade027fa9b245b9; version=a1d75f258230b75d46aecdf28b2e732413028863 <4690e2171f651e2b415e3941ce17f2f7b813aff6; version=a1d75f258230b75d46aecdf28b2e732413028863 <49934861514d36d0995be8e81bb3312a499d8d9a; version=a1d75f258230b75d46aecdf28b2e732413028863 <831433527773e665bdb635ab5783d0b95d1246f4; version=a1d75f258230b75d46aecdf28b2e732413028863 <8c78303eafbf85a728dd84d1750e89240c677dd9; version=a1d75f258230b75d46aecdf28b2e732413028863 <ac42e0f0eb66af966015ee33fd355bc6f5d80cd6

Published CVSS scores

5.5UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-402Transmission of Private Resources into a New Sphere ('Resource Leak')
T1005Data from Local System

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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