CVE-2023-52583

Kernel hang via reversed CephFS dentry locking

Published Mar 6, 2024 · Updated Aug 15, 2026

Improper locking in the Linux CephFS client allows local users to hang kernel filesystem operations through a deadlock. In fs/ceph/caps.c, an unused fallback calls dget() on a parent while the child dentry is already locked, reversing the required parent-before-child lock order. Callers always supply the parent directory, so upstream and Ubuntu evidence indicates that the defective fallback is dead code and the deadlock cannot actually be triggered.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in the Linux CephFS client allows local users to hang kernel filesystem operations through a deadlock. In fs/ceph/caps.c, an unused fallback calls dget() on a parent while the child dentry is already locked, reversing the required parent-before-child lock order. Callers always supply the parent directory, so upstream and Ubuntu evidence indicates that the defective fallback is dead code and the deadlock cannot actually be triggered.

The record

CVE
CVE-2023-52583
Published
Mar 6, 2024
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 6, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=4.11
  2. Affected versionversion=adf0d68701c7f3e50f21308c76f41e60956a6832 <196b87e5c00ce021e164a5de0f0d04f4116a9160
  3. Affected versionversion=adf0d68701c7f3e50f21308c76f41e60956a6832 <6ab4fd508fad942f1f1ba940492f2735e078e980
  4. Affected versionversion=adf0d68701c7f3e50f21308c76f41e60956a6832 <76cb2aa3421fee4fde706dec41b1344bc0a9ad67
  5. Affected versionversion=adf0d68701c7f3e50f21308c76f41e60956a6832 <7f2649c94264d00df6b6ac27161e9f4372a3450e
  6. Affected versionversion=adf0d68701c7f3e50f21308c76f41e60956a6832 <a9c15d6e8aee074fae66c04d114f20b84274fcca
  7. Affected versionversion=adf0d68701c7f3e50f21308c76f41e60956a6832 <b493ad718b1f0357394d2cdecbf00a44a36fa085
  8. Affected versionversion=adf0d68701c7f3e50f21308c76f41e60956a6832 <e016e358461b89b231626fcf78c5c38e35c44fd3
  9. Affected versionversion=adf0d68701c7f3e50f21308c76f41e60956a6832 <eb55ba8aa7fb7aad54f40fbf4d8dcdfdba0bebf6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.11; version=adf0d68701c7f3e50f21308c76f41e60956a6832 <196b87e5c00ce021e164a5de0f0d04f4116a9160; version=adf0d68701c7f3e50f21308c76f41e60956a6832 <6ab4fd508fad942f1f1ba940492f2735e078e980; version=adf0d68701c7f3e50f21308c76f41e60956a6832 <76cb2aa3421fee4fde706dec41b1344bc0a9ad67; version=adf0d68701c7f3e50f21308c76f41e60956a6832 <7f2649c94264d00df6b6ac27161e9f4372a3450e; version=adf0d68701c7f3e50f21308c76f41e60956a6832 <a9c15d6e8aee074fae66c04d114f20b84274fcca; version=adf0d68701c7f3e50f21308c76f41e60956a6832 <b493ad718b1f0357394d2cdecbf00a44a36fa085; version=adf0d68701c7f3e50f21308c76f41e60956a6832 <e016e358461b89b231626fcf78c5c38e35c44fd3; version=adf0d68701c7f3e50f21308c76f41e60956a6832 <eb55ba8aa7fb7aad54f40fbf4d8dcdfdba0bebf6

Published CVSS scores

5.5Canonical UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NIST NVDCVSS: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.

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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

CWE-667Improper Locking

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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