CVE-2022-48628

System crash via unquiesced metadata replies

Published Mar 2, 2024 · Updated Aug 11, 2026

A CephFS use-after-free in affected Linux kernels allows local users to crash the kernel by unmounting an encrypted filesystem. During shutdown, ceph_mdsc_pre_umount flushes dirty capability and snapshot metadata without waiting for MDS acknowledgments, allowing late handlers to retain inodes past superblock teardown. The crash requires a mounted CephFS, an unmount operation, and delayed MDS replies; encryption exposes the documented sb->s_master_keys dereference.

CVSS severity5.5
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

A CephFS use-after-free in affected Linux kernels allows local users to crash the kernel by unmounting an encrypted filesystem. During shutdown, ceph_mdsc_pre_umount flushes dirty capability and snapshot metadata without waiting for MDS acknowledgments, allowing late handlers to retain inodes past superblock teardown. The crash requires a mounted CephFS, an unmount operation, and delayed MDS replies; encryption exposes the documented sb->s_master_keys dereference.

The record

CVE
CVE-2022-48628
Published
Mar 2, 2024
Updated
Aug 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 2, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 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=2.6.34
  2. Affected versionversion=2f2dc053404febedc9c273452d9d518fb31fde72 <47f82395f04a976d4fa97de7f2acffa1c1096571
  3. Affected versionversion=2f2dc053404febedc9c273452d9d518fb31fde72 <89744b64914426cbabceb3d8a149176b5dafdfb5
  4. Affected versionversion=2f2dc053404febedc9c273452d9d518fb31fde72 <e3dfcab2080dc1f9a4b09cc1327361bc2845bfcd

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.34; version=2f2dc053404febedc9c273452d9d518fb31fde72 <47f82395f04a976d4fa97de7f2acffa1c1096571; version=2f2dc053404febedc9c273452d9d518fb31fde72 <89744b64914426cbabceb3d8a149176b5dafdfb5; version=2f2dc053404febedc9c273452d9d518fb31fde72 <e3dfcab2080dc1f9a4b09cc1327361bc2845bfcd

Published CVSS scores

4.4SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L
5.5National Vulnerability DatabaseCVSS: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 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 exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo