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CVE Record

CVE-2021-47422: drm/nouveau/kms/nv50-: fix file release memory leak

In the Linux kernel, the following vulnerability has been resolved: drm/nouveau/kms/nv50-: fix file release memory leak When using single_open() for opening, single_release() should be called, otherwise the 'op' allocated in single_open() will be leaked.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysislow

Security readout for executives and security teams

Plain-English summary

This is a Linux kernel memory leak in the nouveau graphics driver. When a specific file-open helper is used, the matching release cleanup was not called, leaking allocated memory. The business risk appears limited, but affected Linux systems using nouveau should receive the relevant stable kernel fix through normal patch channels.

Executive priority

Handle through routine kernel patch management unless nouveau-dependent Linux systems are mission-critical or difficult to reboot. There is no cited evidence of active exploitation or high-impact compromise behavior.

Technical view

The issue is in drm/nouveau/kms/nv50-. Code using single_open() failed to call single_release(), leaking the operation structure allocated during open. The CVE record lists affected Linux kernel versions including 5.9, 5.10.73, 5.14.12, and 5.15, with fixes referenced in Linux stable commits.

Likely exposure

Exposure is likely limited to Linux systems running affected kernels with the nouveau DRM/KMS driver in use. The provided sources do not identify affected distributions, packaged kernel ranges, or non-Linux products.

Exploitation context

The source bundle does not report active exploitation, and CISA KEV status is false. The available evidence describes a memory leak, not privilege escalation, remote code execution, or data disclosure. Practical abuse conditions are not documented in the provided sources.

Researcher notes

Evidence is narrow: the CVE text and stable commits describe a missing single_release() after single_open(). No CVSS, CWE, exploit details, affected distribution packages, or operational mitigations are provided in the source bundle.

Mitigation direction

  • Update to a Linux kernel containing the referenced stable fixes.
  • Use distribution kernel updates when available instead of manual patching.
  • Prioritize Linux hosts using the nouveau DRM/KMS driver.
  • Track vendor advisories for backported fixes and package-specific status.
  • Check Linux stable guidance if no packaged fix is available.

Validation and detection

  • Inventory Linux kernel versions across affected systems.
  • Check whether the nouveau driver is loaded or required.
  • Verify the installed kernel includes a referenced fix or vendor backport.
  • Confirm distribution advisories map local packages to fixed kernels.
  • Monitor for unusual memory growth on systems awaiting patching.
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

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-2021-47422 mapping review

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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
4Source 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

CISA-ADPCISA ADP Vulnrichment
other:ssvc
CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux12885ecbfe62df4358d452080d3b8feef54ec8cb, 12885ecbfe62df4358d452080d3b8feef54ec8cb, 12885ecbfe62df4358d452080d3b8feef54ec8cbunaffected
LinuxLinux5.9, 0, 5.10.73, 5.14.12, 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.