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CVE Record

CVE-2021-47000: ceph: fix inode leak on getattr error in __fh_to_dentry

In the Linux kernel, the following vulnerability has been resolved: ceph: fix inode leak on getattr error in __fh_to_dentry

LowCVSS 3.3Not KEV-listedUpdated
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Glexia's TakeAutomated analysislow

Security readout for executives and security teams

Plain-English summary

CVE-2021-47000 is a low-severity Linux kernel Ceph issue where an error path can leak inode references. The known impact is limited availability degradation, not data theft or tampering. Business urgency is mainly for systems using the kernel Ceph client on affected kernel branches.

Executive priority

Treat as routine patch management, not an emergency response item. Prioritize affected Ceph-backed Linux infrastructure during the next maintenance window, especially where local user access is common or availability margins are tight.

Technical view

The issue is in Linux kernel Ceph handling of getattr errors inside __fh_to_dentry. The CVSS vector is local, low complexity, low privileges required, no user interaction, and low availability impact only. The source bundle identifies stable kernel commits that resolve the inode leak.

Likely exposure

Exposure is most relevant on Linux systems using Ceph kernel functionality with affected kernel versions or missing the referenced stable commits. Systems not using Ceph kernel paths are less likely to be practically exposed based on the available evidence.

Exploitation context

The source bundle does not show CISA KEV listing or any cited active exploitation. The CVSS vector requires local access with low privileges and indicates only low availability impact. No public exploit details are provided in the supplied sources.

Researcher notes

Evidence is limited to the CVE record, CVSS data, affected version metadata, and Linux stable commit references. The bundle names the fix but does not provide exploit evidence, detailed trigger conditions, or distribution-specific fixed package versions.

Mitigation direction

  • Update to a vendor kernel release containing the referenced Linux stable fixes.
  • Check distribution advisories for CVE-2021-47000 or the listed kernel commit IDs.
  • Prioritize Ceph-using Linux hosts over systems without Ceph kernel functionality.
  • Monitor affected hosts for resource pressure until patched.

Validation and detection

  • Inventory Linux kernel versions on systems using Ceph kernel functionality.
  • Confirm whether vendor kernels include one of the referenced stable commits.
  • Review kernel changelogs for CVE-2021-47000 or the Ceph inode leak fix.
  • Validate normal Ceph filesystem operations after kernel update.
Prepared
Confidence
high
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

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

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CVE-2021-47000 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Low
CVSS
3.3 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:L/AC:L/PR:L/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
3.3CVSS 3.1LowCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L1.81.4CISA-ADP

Vulnerability scoring details

Base CVSS 3.1 score

3.3Low
CVSS 3.1 vector shape for CVE-2021-47000Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:L/AC:L/PR:L/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
LinuxLinux807460787179dee5f74906965eeb5f3ca2353992, 878dabb64117406abd40977b87544d05bb3031fc, 878dabb64117406abd40977b87544d05bb3031fc, 878dabb64117406abd40977b87544d05bb3031fc, 878dabb64117406abd40977b87544d05bb3031fc, 10b7ddff50b3334414c0be4b6009671b18ba4845unaffected
LinuxLinux5.8, 0, 5.4.120, 5.10.38, 5.11.22, 5.12.5, 5.13affected
Weakness

CWE details

No CWE listed

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