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CVE Record

CVE-2024-56749: dlm: fix dlm_recover_members refcount on error

In the Linux kernel, the following vulnerability has been resolved: dlm: fix dlm_recover_members refcount on error If dlm_recover_members() fails we don't drop the references of the previous created root_list that holds and keep all rsbs alive during the recovery. It might be not an unlikely event because ping_members() could run into an -EINTR if another recovery progress was triggered again.

HighCVSS 7.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A Linux kernel error in the Distributed Lock Manager can retain references to cluster-locking objects when membership recovery fails. Repeated recovery interruptions may keep resources alive and degrade availability. The supplied assessment rates this high at CVSS 7.5, but it does not show data theft or modification impact.

Executive priority

Prioritize affected DLM-based clusters because repeated recovery errors may consume resources and disrupt critical clustered services. Treat non-DLM Linux hosts as lower priority after confirming DLM is unused. No supplied evidence supports emergency response for active exploitation, but high-availability environments should remediate promptly.

Technical view

When dlm_recover_members() fails, references held by the previously created root_list are not released, leaving resource blocks alive. The failure can occur when ping_members() returns -EINTR because another recovery begins. This reference leak can accumulate during recovery failures and affect availability.

Likely exposure

Exposure is most relevant to Linux systems actively using DLM for clustered locking and running an affected kernel or vendor backport. The bundle lists 6.10, 6.11.11, 6.12.2, and 6.13 among affected versions, but does not provide a complete distribution-specific package matrix.

Exploitation context

The supplied record is not in CISA KEV and provides no evidence of active exploitation or a public exploit. Although the CVSS vector says network-accessible, the sources do not establish arbitrary Internet exploitation; the defect occurs in DLM membership recovery and primarily threatens availability.

Researcher notes

The defect is a reference-management failure on the dlm_recover_members() error path. The source bundle supplies no CWE, trigger thresholds, memory-growth measurements, crash evidence, or complete vulnerable-version boundaries. Validate exposure against distribution backports rather than kernel version strings alone. Avoid interpreting the network CVSS vector as proof of direct remote reachability.

Mitigation direction

  • Identify systems using the Linux Distributed Lock Manager and prioritize clustered production workloads.
  • Check distribution advisories for a kernel package containing the applicable stable fix or backport.
  • Test and deploy the corrected vendor kernel through normal maintenance procedures.
  • Reduce repeated cluster recovery conditions where operationally safe until remediation is complete.

Validation and detection

  • Record running kernel and distribution package versions on systems using DLM.
  • Confirm the installed package includes the applicable cited stable-kernel commit or vendor backport.
  • Review cluster logs for repeated recovery restarts, interruptions, or DLM membership failures.
  • Monitor kernel memory and cluster availability before and after remediation.
Prepared
Confidence
medium
Sources
5

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

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CVE-2024-56749 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.5 (3.1)
Known Exploited
No
Published

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

2CVSS vectors
3Timeline events
1ADP providers
4Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

CVSS vector scores

2 official scores

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
7.5CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6Linux
5.5CVSS 3.1MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H1.83.6CISA-ADP

Vulnerability scoring details

Base CVSS 3.1 score

7.5High
CVSS 3.1 vector shape for CVE-2024-56749Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
cvssV3_1other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux3a747f4a2ee85d51b905e2df940de4a924f8060a, 3a747f4a2ee85d51b905e2df940de4a924f8060a, 3a747f4a2ee85d51b905e2df940de4a924f8060aunaffected
LinuxLinux6.10, 0, 6.11.11, 6.12.2, 6.13affected
Weakness

CWE details

No CWE listed

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