CVE-2022-50059Network attack vector

CephFS hang via unreleased snapshot semaphore

Published Jun 18, 2025 · Updated Aug 5, 2026

Denial of service in Linux CephFS clients 5.8 through 5.19.3 allows remote attackers to hang filesystem operations via an MDS IMPORT message. In fs/ceph/caps.c, handle_cap_grant returns on the i_auth_cap != cap path without releasing snap_rwsem, blocking later write-lock takers. A malicious, compromised, or on-path MDS can trigger the flaw after CephFS is mounted, leaving the client hung until reboot.

CVSS severity7.5
High
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Linux CephFS clients 5.8 through 5.19.3 allows remote attackers to hang filesystem operations via an MDS IMPORT message. In fs/ceph/caps.c, handle_cap_grant returns on the i_auth_cap != cap path without releasing snap_rwsem, blocking later write-lock takers. A malicious, compromised, or on-path MDS can trigger the flaw after CephFS is mounted, leaving the client hung until reboot.

The record

CVE
CVE-2022-50059
Published
Jun 18, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=5.8
  2. Affected versionversion=6f05b30ea063a2a05dda47a4105a69267ae5270f <58dd4385577ed7969b80cdc9e2a31575aba6c712
  3. Affected versionversion=6f05b30ea063a2a05dda47a4105a69267ae5270f <a090cc69699ec2d11b5e34cee8c61f0d4b0068cb
  4. Affected versionversion=6f05b30ea063a2a05dda47a4105a69267ae5270f <aee18421bda6bf12a7cba6a3d7751c0e1cfd0094
  5. Affected versionversion=6f05b30ea063a2a05dda47a4105a69267ae5270f <f546faa216d0f53a42ca73ba1fd8c48765b22d77

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.8; version=6f05b30ea063a2a05dda47a4105a69267ae5270f <58dd4385577ed7969b80cdc9e2a31575aba6c712; version=6f05b30ea063a2a05dda47a4105a69267ae5270f <a090cc69699ec2d11b5e34cee8c61f0d4b0068cb; version=6f05b30ea063a2a05dda47a4105a69267ae5270f <aee18421bda6bf12a7cba6a3d7751c0e1cfd0094; version=6f05b30ea063a2a05dda47a4105a69267ae5270f <f546faa216d0f53a42ca73ba1fd8c48765b22d77

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.5kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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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