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CVE Record

CVE-2021-47466: mm, slub: fix potential memoryleak in kmem_cache_open()

In the Linux kernel, the following vulnerability has been resolved: mm, slub: fix potential memoryleak in kmem_cache_open() In error path, the random_seq of slub cache might be leaked. Fix this by using __kmem_cache_release() to release all the relevant resources.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This Linux kernel issue is a potential memory leak in an error path of the SLUB memory allocator. The public record does not provide CVSS scoring, exploitation evidence, or business impact details. Treat it as a kernel hygiene fix unless your vendor identifies a higher-risk exposure.

Executive priority

Low immediate urgency based on available evidence, but do not ignore it. Kernel memory leaks can affect stability, and remediation should follow normal kernel patch cycles once vendor packages are available.

Technical view

In kmem_cache_open(), the SLUB cache random_seq allocation could be leaked when initialization fails. The kernel fix changes cleanup to use __kmem_cache_release(), releasing associated resources. The source bundle identifies Linux kernel as affected and lists stable kernel commit references.

Likely exposure

Exposure is limited to systems running affected Linux kernel builds before the relevant stable fixes or without equivalent vendor backports. The bundle does not identify specific distributions, configurations, or remotely reachable attack surfaces.

Exploitation context

No active exploitation is cited, and the CVE is not marked as KEV. The sources describe a resource leak in an error path, but do not explain whether attackers can reliably trigger it.

Researcher notes

The record lacks CVSS, CWE, exploitability analysis, and distribution-specific affected ranges. Focus validation on kernel provenance and whether the SLUB cleanup fix is present rather than assuming all Linux systems are equally exposed.

Mitigation direction

  • Apply a vendor kernel update containing the referenced stable fixes or equivalent backport.
  • Check Linux distribution advisories for affected package versions and backport status.
  • Prioritize internet-facing and production Linux hosts after vendor severity guidance is available.
  • Include managed appliances and cloud images in kernel version review.

Validation and detection

  • Inventory Linux kernel versions across servers, containers hosts, appliances, and cloud images.
  • Confirm whether installed vendor kernels include the referenced stable commits or backports.
  • Review vendor advisories for CVSS, affected packages, and required reboot guidance.
  • Track remediation evidence by asset and kernel package version.
Prepared
Confidence
medium
Sources
6

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-2021-47466 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
Unknown
CVSS
Not scored
Known Exploited
No
Published
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.

0CVSS vectors
3Timeline events
2ADP providers
5Source links

SSVC decision data

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

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

CVECVE Program Container
CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux210e7a43fa905bccafa9bb5966fba1d71f33eb8b, 210e7a43fa905bccafa9bb5966fba1d71f33eb8b, 210e7a43fa905bccafa9bb5966fba1d71f33eb8b, 210e7a43fa905bccafa9bb5966fba1d71f33eb8bunaffected
LinuxLinux4.8, 0, 5.4.156, 5.10.76, 5.14.15, 5.15affected
Weakness

CWE details

No CWE listed

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