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CVE Record

CVE-2021-47020: soundwire: stream: fix memory leak in stream config error path

In the Linux kernel, the following vulnerability has been resolved: soundwire: stream: fix memory leak in stream config error path When stream config is failed, master runtime will release all slave runtime in the slave_rt_list, but slave runtime is not added to the list at this time. This patch frees slave runtime in the config error path to fix the memory leak.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysislow

Security readout for executives and security teams

Plain-English summary

This CVE is a Linux kernel SoundWire memory leak. If stream configuration fails, one runtime object is not released because it has not yet been added to the cleanup list. The provided sources do not show active exploitation, CVSS scoring, or a practical attacker path.

Executive priority

Handle through routine kernel patch management unless local evidence shows SoundWire exposure on sensitive or availability-critical systems. There is no source-backed evidence of active exploitation or critical business impact in the provided bundle.

Technical view

The fixed bug is in the Linux kernel SoundWire stream configuration error path. On configuration failure, master runtime cleanup releases slave runtimes already on slave_rt_list, but the current slave runtime is not yet listed. The stable commits free that runtime directly on the error path.

Likely exposure

Exposure is likely limited to Linux systems using affected kernel builds with SoundWire audio support. The bundle lists Linux as affected, including version ranges around 4.18 through 5.13, but does not identify distributions, devices, or default configurations.

Exploitation context

The CVE is not listed as KEV in the bundle. The sources describe a memory leak fix, not active exploitation, exploit code, privilege requirements, or remote reachability. Treat exploitation evidence as incomplete.

Researcher notes

The source record is sparse: no CVSS, CWE, exploit status, or distribution mapping is provided. Analysis should focus on confirming affected kernel branches, vendor backports, SoundWire configuration, and whether repeated configuration failures are possible in the local environment.

Mitigation direction

  • Check the OS or kernel vendor advisory for CVE-2021-47020 applicability.
  • Apply a kernel update that includes the referenced Linux stable SoundWire fixes.
  • Prioritize systems with SoundWire audio hardware or related kernel modules enabled.
  • Use normal change control and reboot planning for kernel replacement.

Validation and detection

  • Inventory Linux kernel versions and vendor package builds across managed assets.
  • Confirm whether SoundWire support is present or loaded on relevant systems.
  • Verify the installed kernel includes the referenced stable fix commit from the vendor.
  • Review vulnerability scanner findings against vendor backport notes before closing.
Prepared
Confidence
medium
Sources
8

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-2021-47020 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
7Source 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
LinuxLinux89e590535f32d4bc548bcf266f3b046e50942f6d, 89e590535f32d4bc548bcf266f3b046e50942f6d, 89e590535f32d4bc548bcf266f3b046e50942f6d, 89e590535f32d4bc548bcf266f3b046e50942f6d, 89e590535f32d4bc548bcf266f3b046e50942f6d, 89e590535f32d4bc548bcf266f3b046e50942f6dunaffected
LinuxLinux4.18, 0, 4.19.191, 5.4.119, 5.10.37, 5.11.21, 5.12.4, 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.