CVE-2022-49107

Local denial of service via retained request

Published Feb 26, 2025 · Updated Aug 12, 2026

Memory leak in the Linux kernel CephFS client before 5.18 allows local users to exhaust memory through failed directory reads. In ceph_readdir, an error from note_last_dentry returns after the metadata request is assigned to last_readdir, without releasing the request or resetting the pointer. Exploitation requires local access to a CephFS mount and an allocation failure during a directory read; repeated failures can consume kernel memory and interrupt the host.

CVSS severity5.5
Medium
EPSS probability0.25%
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 the Linux kernel CephFS client before 5.18 allows local users to exhaust memory through failed directory reads. In ceph_readdir, an error from note_last_dentry returns after the metadata request is assigned to last_readdir, without releasing the request or resetting the pointer. Exploitation requires local access to a CephFS mount and an allocation failure during a directory read; repeated failures can consume kernel memory and interrupt the host.

The record

CVE
CVE-2022-49107
Published
Feb 26, 2025
Updated
Aug 12, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 12, 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=2.6.34
  2. Affected versionversion=2817b000b02c5f0c05af67c01fb2684e1381d6ef <2fe82d3254029ef9ec4e7be890125d5ef4f537de
  3. Affected versionversion=2817b000b02c5f0c05af67c01fb2684e1381d6ef <7f740ede35132d3d5d19747cad56a511d21bb156
  4. Affected versionversion=2817b000b02c5f0c05af67c01fb2684e1381d6ef <e792575b902a3939ca482491ee9fb3a236f99640
  5. Affected versionversion=2817b000b02c5f0c05af67c01fb2684e1381d6ef <f4429786129648a8f4bb1e5faa143c4478cc5c4a
  6. Affected versionversion=2817b000b02c5f0c05af67c01fb2684e1381d6ef <f639d9867eea647005dc824e0e24f39ffc50d4e4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.34; version=2817b000b02c5f0c05af67c01fb2684e1381d6ef <2fe82d3254029ef9ec4e7be890125d5ef4f537de; version=2817b000b02c5f0c05af67c01fb2684e1381d6ef <7f740ede35132d3d5d19747cad56a511d21bb156; version=2817b000b02c5f0c05af67c01fb2684e1381d6ef <e792575b902a3939ca482491ee9fb3a236f99640; version=2817b000b02c5f0c05af67c01fb2684e1381d6ef <f4429786129648a8f4bb1e5faa143c4478cc5c4a; version=2817b000b02c5f0c05af67c01fb2684e1381d6ef <f639d9867eea647005dc824e0e24f39ffc50d4e4

Published CVSS scores

5.5NVDCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
T1499Endpoint Denial of Service

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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