CVE-2022-50743Public exploit

Kernel memory leak via misclassified non-inline pcluster

Published Dec 24, 2025 · Updated Dec 24, 2025

Memory leak in Linux kernel EROFS allows local users to consume kernel memory by triggering reads of crafted compressed filesystem data. The z_erofs_register_pcluster function assigns object index zero to a non-inline pcluster with a zero block address, so a later lookup increments a workgroup reference that is never released. The published reproducer reaches the flaw through file readahead after mounting the malformed image and records unreleased 136-byte allocations.

CVSS severity5.5
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leak in Linux kernel EROFS allows local users to consume kernel memory by triggering reads of crafted compressed filesystem data. The z_erofs_register_pcluster function assigns object index zero to a non-inline pcluster with a zero block address, so a later lookup increments a workgroup reference that is never released. The published reproducer reaches the flaw through file readahead after mounting the malformed image and records unreleased 136-byte allocations.

The record

CVE
CVE-2022-50743
Published
Dec 24, 2025
Updated
Dec 24, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 24, 2025Record 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=5.17
  2. Affected versionversion=cecf864d3d76d50e3d9c58145e286a0b8c284e92 <618e712b99c78d1004b70a1a9ab0a4830d0b2673
  3. Affected versionversion=cecf864d3d76d50e3d9c58145e286a0b8c284e92 <ac54c1f7b288d83b6ba1e320efff24ecc21309cd
  4. Affected versionversion=cecf864d3d76d50e3d9c58145e286a0b8c284e92 <c42c0ffe81176940bd5dead474216b7198d77675

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.17; version=cecf864d3d76d50e3d9c58145e286a0b8c284e92 <618e712b99c78d1004b70a1a9ab0a4830d0b2673; version=cecf864d3d76d50e3d9c58145e286a0b8c284e92 <ac54c1f7b288d83b6ba1e320efff24ecc21309cd; version=cecf864d3d76d50e3d9c58145e286a0b8c284e92 <c42c0ffe81176940bd5dead474216b7198d77675

Published CVSS scores

4.9TenableAV:L/AC:L/Au:N/C:N/I:N/A:C
5.5TenableCVSS:3.0/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1499.004Application or System Exploitation

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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