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CVE Record

CVE-2021-47053: crypto: sun8i-ss - Fix memory leak of pad

In the Linux kernel, the following vulnerability has been resolved: crypto: sun8i-ss - Fix memory leak of pad It appears there are several failure return paths that don't seem to be free'ing pad. Fix these. Addresses-Coverity: ("Resource leak")

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 resource leak in the sun8i-ss crypto driver. Certain error paths failed to free allocated memory. The source bundle does not provide CVSS, impact details, or evidence of exploitation, so business urgency depends on whether affected Linux kernels and this driver are present in your environment.

Executive priority

Treat this as a targeted maintenance item unless asset inventory shows affected kernels on critical systems. There is no source-backed evidence of exploitation or severe impact, but kernel resource leaks can affect reliability and should be handled through normal patch governance.

Technical view

CVE-2021-47053 resolves a memory leak of pad allocation in Linux kernel crypto/sun8i-ss failure return paths. The public description ties it to Coverity resource-leak findings and references stable kernel commits. No exploitability analysis, CVSS vector, CWE, or attack prerequisites are provided in the bundle.

Likely exposure

Exposure appears limited to Linux systems running affected kernel versions or downstream builds containing the vulnerable sun8i-ss crypto driver code. The bundle lists Linux kernel version markers including 5.10, 5.10.37, 5.11.21, 5.12.4, and 5.13, but does not describe affected distributions.

Exploitation context

The source bundle does not cite active exploitation, public exploit code, or inclusion in CISA KEV. The issue is described as a memory leak on failure paths, not as a confirmed privilege escalation, remote code execution, or data exposure vulnerability.

Researcher notes

Evidence is sparse. The record identifies a Linux kernel memory leak fix and stable commit references, but lacks CVSS, CWE, exploitability details, or distribution advisories. Validation should focus on code lineage, backports, and whether sun8i-ss is relevant to deployed kernels.

Mitigation direction

  • Check vendor kernel advisories for CVE-2021-47053 coverage.
  • Upgrade to a kernel build containing the referenced stable fixes.
  • Prioritize systems using the sun8i-ss crypto driver.
  • Track affected embedded or appliance Linux images separately.
  • Monitor vendor guidance if packaged fixes are unavailable.

Validation and detection

  • Inventory Linux kernel versions across managed assets.
  • Confirm whether sun8i-ss driver code is present or enabled.
  • Review kernel package changelogs for the referenced fix commits.
  • Verify updated systems no longer run affected kernel builds.
  • Document any vendor kernels awaiting backported fixes.
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-2021-47053 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
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

CISA-ADPCISA ADP Vulnrichment
other:ssvc
CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxd9b45418a91773b7672e4c60037a28074b495c6d, d9b45418a91773b7672e4c60037a28074b495c6d, d9b45418a91773b7672e4c60037a28074b495c6d, d9b45418a91773b7672e4c60037a28074b495c6dunaffected
LinuxLinux5.10, 0, 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.