CVE-2022-48767

Local denial of service via CephFS reference leak

Published Jun 20, 2024 · Updated May 11, 2026

Affected Linux kernel CephFS clients starting with 5.7 allow local users to exhaust kernel memory through repeated file creation. The try_prep_async_create path acquires a pool-namespace ceph_string reference, but retry and completion exits omit ceph_put_string. Triggering the leak requires local low-privileged access to create files on a mounted CephFS filesystem, and repetition can interrupt service.

CVSS severity5.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Affected Linux kernel CephFS clients starting with 5.7 allow local users to exhaust kernel memory through repeated file creation. The try_prep_async_create path acquires a pool-namespace ceph_string reference, but retry and completion exits omit ceph_put_string. Triggering the leak requires local low-privileged access to create files on a mounted CephFS filesystem, and repetition can interrupt service.

The record

CVE
CVE-2022-48767
Published
Jun 20, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 20, 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

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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=5.7
  2. Affected versionversion=9a8d03ca2e2c334d08ee91a3e07dcce31a02fdc6 <36d433ae3242aa714176378850e6d1a5a3e78f18
  3. Affected versionversion=9a8d03ca2e2c334d08ee91a3e07dcce31a02fdc6 <932a9b5870d38b87ba0a9923c804b1af7d3605b9
  4. Affected versionversion=9a8d03ca2e2c334d08ee91a3e07dcce31a02fdc6 <a0c22e970cd78b81c94691e6cb09713e8074d580
  5. Affected versionversion=9a8d03ca2e2c334d08ee91a3e07dcce31a02fdc6 <e7be12ca7d3947765b0d7c1c7e0537e748da993a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.7; version=9a8d03ca2e2c334d08ee91a3e07dcce31a02fdc6 <36d433ae3242aa714176378850e6d1a5a3e78f18; version=9a8d03ca2e2c334d08ee91a3e07dcce31a02fdc6 <932a9b5870d38b87ba0a9923c804b1af7d3605b9; version=9a8d03ca2e2c334d08ee91a3e07dcce31a02fdc6 <a0c22e970cd78b81c94691e6cb09713e8074d580; version=9a8d03ca2e2c334d08ee91a3e07dcce31a02fdc6 <e7be12ca7d3947765b0d7c1c7e0537e748da993a

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.3CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

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

T1499.004Endpoint Denial of Service: Application or System Exploitation

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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