CVE-2022-50465

Kernel-memory disclosure via uncleared fast-commit journal space

Published Oct 1, 2025 · Updated Oct 1, 2025

Information disclosure in the ext4 fast-commit journal in Linux allows local users to cause uninitialized kernel memory to be written to disk. The ext4_fc_reserve_space and ext4_fc_write_tail paths submit journal blocks without clearing the unused final byte or the space following the tail checksum. Exploitation requires local low-privileged access and an ext4 filesystem using fast commits; the exposed bytes remain in journal storage rather than being returned directly to the user.

CVSS severity5.5
Medium
EPSS probability0.15%
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 ext4 fast-commit journal in Linux allows local users to cause uninitialized kernel memory to be written to disk. The ext4_fc_reserve_space and ext4_fc_write_tail paths submit journal blocks without clearing the unused final byte or the space following the tail checksum. Exploitation requires local low-privileged access and an ext4 filesystem using fast commits; the exposed bytes remain in journal storage rather than being returned directly to the user.

The record

CVE
CVE-2022-50465
Published
Oct 1, 2025
Updated
Oct 1, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 1, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 1, 2025Record 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=5.10
  2. Affected versionversion=aa75f4d3daaeb1389b9cce9d6b84401eaf228d4e <594bc43b410316d70bb42aeff168837888d96810
  3. Affected versionversion=aa75f4d3daaeb1389b9cce9d6b84401eaf228d4e <7c1fb65e8ce85c281d2cba9c236f9edbbc4eaca6
  4. Affected versionversion=aa75f4d3daaeb1389b9cce9d6b84401eaf228d4e <871800770d7f2f952c7249ad52485c3564dab44e
  5. Affected versionversion=aa75f4d3daaeb1389b9cce9d6b84401eaf228d4e <b8b7922374b00a44137e5bcdd46ef86c8b065f27
  6. Affected versionversion=aa75f4d3daaeb1389b9cce9d6b84401eaf228d4e <d9ba03eb03dc2dccb5450de388ea46bdcaaf8348

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.10; version=aa75f4d3daaeb1389b9cce9d6b84401eaf228d4e <594bc43b410316d70bb42aeff168837888d96810; version=aa75f4d3daaeb1389b9cce9d6b84401eaf228d4e <7c1fb65e8ce85c281d2cba9c236f9edbbc4eaca6; version=aa75f4d3daaeb1389b9cce9d6b84401eaf228d4e <871800770d7f2f952c7249ad52485c3564dab44e; version=aa75f4d3daaeb1389b9cce9d6b84401eaf228d4e <b8b7922374b00a44137e5bcdd46ef86c8b065f27; version=aa75f4d3daaeb1389b9cce9d6b84401eaf228d4e <d9ba03eb03dc2dccb5450de388ea46bdcaaf8348

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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