LiveActive security incident?Get immediate response
CVE Record

CVE-2021-47524: serial: liteuart: fix minor-number leak on probe errors

In the Linux kernel, the following vulnerability has been resolved: serial: liteuart: fix minor-number leak on probe errors Make sure to release the allocated minor number before returning on probe errors.

UnknownCVSS not scoredNot KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysislow

Security readout for executives and security teams

Plain-English summary

This Linux kernel issue is a resource leak in the LiteUART serial driver. If driver probing fails, an allocated minor number may not be released. The source bundle does not show code execution, privilege escalation, data exposure, or active exploitation.

Executive priority

Treat this as a low-priority kernel maintenance item unless LiteUART is used in critical embedded systems. It does not currently warrant emergency response based on the provided evidence, but should be folded into normal kernel patch cycles.

Technical view

CVE-2021-47524 resolves a LiteUART probe-error path that failed to release an allocated serial minor number. The referenced stable commits describe releasing the minor before returning on probe errors. No CVSS, CWE, or exploit evidence is provided.

Likely exposure

Exposure appears limited to Linux systems using the LiteUART serial driver, commonly relevant to specialized embedded or FPGA-oriented deployments. The bundle lists Linux kernel affected entries including 5.11, 5.15.7, and 5.16; validate exact branch status against the referenced stable commits.

Exploitation context

No KEV listing is present, and the provided sources do not claim active exploitation. The issue requires a probe-error condition in the LiteUART driver path; available evidence supports resource leakage impact, not direct compromise.

Researcher notes

Evidence is sparse: the public description only identifies a minor-number leak on probe errors and two stable commit references. No CVSS vector, CWE mapping, reproducer, exploit status, or detailed affected-range normalization is included in the bundle.

Mitigation direction

  • Review kernel vendor guidance for your maintained branch.
  • Apply the stable kernel fix that releases the minor number on probe errors.
  • Prioritize systems that enable or load the LiteUART serial driver.
  • Disable unused LiteUART support where operationally safe.
  • Track downstream distribution advisories for backported fixes.

Validation and detection

  • Inventory kernels that include or enable the LiteUART serial driver.
  • Compare deployed kernel versions with vendor-fixed branches and stable commits.
  • Check distribution changelogs for CVE-2021-47524 backports.
  • Review boot and driver logs for repeated LiteUART probe failures.
  • Confirm post-update kernel package includes the referenced fix.
Prepared
Confidence
medium
Sources
4

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.

cve · low confidence lookup

CVE-2021-47524 mapping review

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

Open ATT&CK lookup
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
3Source 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
LinuxLinux1da81e5562fac8286567422cc56a7fbd0dc646d4, 1da81e5562fac8286567422cc56a7fbd0dc646d4unaffected
LinuxLinux5.11, 0, 5.15.7, 5.16affected
Weakness

CWE details

No CWE listed

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