CVE-2024-56564

Service interruption via leaked credential references

Published Dec 27, 2024 · Updated May 11, 2026

Credential reference leakage in the Linux kernel Ceph client 6.10 through 6.12.3 allows local users to interrupt service via metadata access. ceph_mds_auth_match() redundantly calls get_current_cred() after ceph_mds_check_access() has already obtained the credential pointer, adding a reference that is never released. Repeated authorization checks from a local low-privileged context accumulate unreleased references until kernel resources are exhausted and service is interrupted.

CVSS severity5.5
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Credential reference leakage in the Linux kernel Ceph client 6.10 through 6.12.3 allows local users to interrupt service via metadata access. ceph_mds_auth_match() redundantly calls get_current_cred() after ceph_mds_check_access() has already obtained the credential pointer, adding a reference that is never released. Repeated authorization checks from a local low-privileged context accumulate unreleased references until kernel resources are exhausted and service is interrupted.

The record

CVE
CVE-2024-56564
Published
Dec 27, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 27, 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=596afb0b8933ba6ed7227adcc538db26feb25c74 <23426309a4064b25a961e1c72961d8bfc7c8c990
  2. Affected versionversion=596afb0b8933ba6ed7227adcc538db26feb25c74 <ffa6ba7bdb7f07f49c9e9150b0176df066520f62
  3. Affected versionversion=6.10

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=596afb0b8933ba6ed7227adcc538db26feb25c74 <23426309a4064b25a961e1c72961d8bfc7c8c990; version=596afb0b8933ba6ed7227adcc538db26feb25c74 <ffa6ba7bdb7f07f49c9e9150b0176df066520f62; version=6.10

Published CVSS scores

3.3SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.8SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

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

T1499Endpoint Denial of Service

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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