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CVE Record

CVE-2024-56563: ceph: fix cred leak in ceph_mds_check_access()

In the Linux kernel, the following vulnerability has been resolved: ceph: fix cred leak in ceph_mds_check_access() get_current_cred() increments the reference counter, but the put_cred() call was missing.

HighCVSS 7.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

Affected Linux kernels can fail to release credential references during Ceph metadata-server access checks. Repeated activity may consume kernel resources and potentially disrupt a host. The supplied CVSS rating is 7.8 (high), but the sources do not establish real-world exploitation or quantify the practical impact.

Executive priority

Treat as a high-priority maintenance issue for Ceph-using Linux infrastructure, especially availability-sensitive systems. Patch through supported distribution channels after identifying affected kernels. Immediate emergency response is not supported by the supplied exploitation evidence.

Technical view

ceph_mds_check_access() called get_current_cred(), which increments a credential reference count, without the corresponding put_cred(). The kernel fixes add the missing release. The supplied affected-version data is ambiguous, so deployment-specific kernel and vendor-advisory verification is required.

Likely exposure

Exposure is most plausible on systems running an affected Linux kernel and exercising the Ceph metadata-server access-check path, typically through Ceph filesystem activity. The bundle references versions beginning around Linux 6.10 and fixes associated with 6.12.4 or 6.13, but its version records are inconsistent.

Exploitation context

CISA KEV status is false, and the supplied sources provide no evidence of active exploitation or a public exploit. The CVSS vector describes a local, low-privilege, low-complexity condition without user interaction; practical exploitability is not demonstrated by the bundle.

Researcher notes

The defect is a credential reference-count leak, not evidence of credential disclosure by itself. The supplied CVSS claims high confidentiality, integrity, and availability impact, but the description only directly establishes a missing reference release. Assess operational impact cautiously and verify downstream backports because version metadata is unclear.

Mitigation direction

  • Apply a vendor-supported kernel containing the referenced upstream stable fix.
  • Prioritize Ceph-using hosts that run potentially affected kernel versions.
  • Check distribution security guidance for exact fixed package versions.
  • Monitor exposed hosts for abnormal kernel-memory growth or instability.

Validation and detection

  • Inventory kernel versions on systems using Ceph filesystem functionality.
  • Confirm whether each distribution kernel includes either referenced fix commit.
  • Verify updated hosts booted into the corrected kernel.
  • Monitor Ceph workloads for resource growth and host instability after remediation.
Prepared
Confidence
medium
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2024-56563 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.8 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
3Timeline events
0ADP providers
3Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7.8CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9Linux

Vulnerability scoring details

Base CVSS 3.1 score

7.8High
CVSS 3.1 vector shape for CVE-2024-56563Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux596afb0b8933ba6ed7227adcc538db26feb25c74, 596afb0b8933ba6ed7227adcc538db26feb25c74unaffected
LinuxLinux6.10, 0, 6.12.4, 6.13affected
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.