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CVE Record

CVE-2024-36947: qibfs: fix dentry leak

In the Linux kernel, the following vulnerability has been resolved: qibfs: fix dentry leak simple_recursive_removal() drops the pinning references to all positives in subtree. For the cases when its argument has been kept alive by the pinning alone that's exactly the right thing to do, but here the argument comes from dcache lookup, that needs to be balanced by explicit dput(). Fucked-up-by: Al Viro <viro@zeniv.linux.org.uk>

MediumCVSS 5.3Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2024-36947 is a Linux kernel bug in qibfs that can leak directory-entry references. The published impact is availability loss, not data theft or tampering. It is rated medium with CVSS 5.3. There is no provided evidence of active exploitation or KEV listing.

Executive priority

Treat as routine-to-near-term kernel maintenance unless critical Linux workloads depend on affected builds. The main business risk is service degradation, not compromise. Prioritize patching through normal kernel update channels and verify vendor coverage.

Technical view

The fix balances a dcache lookup reference with an explicit dput() after simple_recursive_removal(). Without it, qibfs can leak dentries. The CVE record describes this as resolved in Linux stable commits. CVSS is AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L, but the source bundle does not explain practical reachability.

Likely exposure

Exposure is limited to Linux systems running affected kernel versions containing the qibfs dentry leak. The bundle lists Linux kernel as affected across 5.13 and later stable lines, but version-range detail is incomplete. Distribution backports may change exposure.

Exploitation context

No source in the bundle reports exploitation in the wild. The stated consequence is reduced availability from a resource leak. The CVSS vector indicates low-complexity, no-privilege attack characteristics, but the public description does not provide operational prerequisites.

Researcher notes

The source text is terse and kernel-specific. It identifies a reference-counting/dentry leak in qibfs and provides stable commit references, but does not document triggering conditions, affected configurations, or exploitability details. Avoid assuming broad remote exploitability beyond the CVSS metadata.

Mitigation direction

  • Apply Linux kernel updates from your distribution or vendor that include the qibfs fix.
  • Check vendor advisories for exact affected and fixed kernel builds.
  • Prioritize internet-facing or high-availability Linux systems until exposure is confirmed.
  • Track the referenced upstream stable commits during remediation validation.

Validation and detection

  • Inventory Linux kernel versions across servers, appliances, and images.
  • Map each kernel to vendor guidance for CVE-2024-36947.
  • Confirm patched kernels include one of the referenced stable fixes or vendor backports.
  • Review availability monitoring for unexplained resource exhaustion on potentially affected systems.
Prepared
Confidence
medium
Sources
7

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-2024-36947 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.3 (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:L

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
2ADP providers
6Source links

SSVC decision data

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

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
5.3CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L3.91.4CISA-ADP

Vulnerability scoring details

Base CVSS 3.1 score

5.3Medium
CVSS 3.1 vector shape for CVE-2024-36947Attack 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:L

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
CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxe41d237818598c0b17458b4d0416b091a7959e55, e41d237818598c0b17458b4d0416b091a7959e55, e41d237818598c0b17458b4d0416b091a7959e55, e41d237818598c0b17458b4d0416b091a7959e55, e41d237818598c0b17458b4d0416b091a7959e55unaffected
LinuxLinux5.13, 0, 5.15.159, 6.1.91, 6.6.31, 6.8.10, 6.9affected
Weakness

CWE details

No CWE listed

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