LiveActive security incident?Get immediate response
CVE Record

CVE-2021-46962: mmc: uniphier-sd: Fix a resource leak in the remove function

In the Linux kernel, the following vulnerability has been resolved: mmc: uniphier-sd: Fix a resource leak in the remove function A 'tmio_mmc_host_free()' call is missing in the remove function, in order to balance a 'tmio_mmc_host_alloc()' call in the probe. This is done in the error handling path of the probe, but not in the remove function. Add the missing call.

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

Security readout for executives and security teams

Plain-English summary

CVE-2021-46962 is a Linux kernel resource leak in the UniPhier SD/MMC driver. The public record says the driver allocates host resources during probe but failed to free them during removal. The business risk appears limited unless affected kernels run this driver on relevant systems.

Executive priority

Treat this as routine kernel hygiene unless affected embedded platforms use this driver. It should be remediated through normal kernel update cycles, with higher attention only for products relying on UniPhier SD/MMC hardware.

Technical view

The Linux kernel uniphier-sd MMC driver missed a tmio_mmc_host_free() call in its remove function, leaving tmio_mmc_host_alloc() from probe unbalanced. Kernel stable commits add the missing cleanup. The CVE record provides no CVSS, CWE, or detailed impact statement.

Likely exposure

Most exposure is likely in Linux systems that include and use the UniPhier SD/MMC driver, especially embedded or platform-specific deployments. Generic Linux servers are less likely exposed unless this driver is present. Confirm kernel branch, vendor backport status, and driver usage.

Exploitation context

The provided sources do not report active exploitation, and KEV is false. The described condition is a cleanup-path resource leak during driver removal, not a remotely reachable flaw in the public evidence. Practical impact is unclear from the source bundle.

Researcher notes

Evidence is narrow: a missing free in the remove path and stable commits adding it. The source bundle does not establish privilege requirements, attack complexity, confidentiality impact, or exploitability. Validation should focus on driver presence and patch provenance.

Mitigation direction

  • Apply a vendor kernel update containing the referenced stable fix.
  • Confirm the fix is backported for affected kernel branches in use.
  • Prioritize systems using UniPhier SD/MMC hardware or images.
  • If no vendor patch is available, track Linux stable guidance.

Validation and detection

  • Inventory affected Linux kernel versions and vendor build identifiers.
  • Check whether the uniphier-sd driver is built, packaged, or loaded.
  • Verify kernel changelogs include the referenced cleanup fix.
  • Regression test driver removal on representative hardware where applicable.
Prepared
Confidence
medium
Sources
7

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-2021-46962 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
6Source 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
LinuxLinux3fd784f745dd1747863775a99ec749619ee6759c, 3fd784f745dd1747863775a99ec749619ee6759c, 3fd784f745dd1747863775a99ec749619ee6759c, 3fd784f745dd1747863775a99ec749619ee6759c, 3fd784f745dd1747863775a99ec749619ee6759cunaffected
LinuxLinux4.20, 0, 5.4.118, 5.10.36, 5.11.20, 5.12.3, 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.