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CVE Record

CVE-2021-47193: scsi: pm80xx: Fix memory leak during rmmod

In the Linux kernel, the following vulnerability has been resolved: scsi: pm80xx: Fix memory leak during rmmod Driver failed to release all memory allocated. This would lead to memory leak during driver removal. Properly free memory when the module is removed.

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 driver cleanup bug. When the pm80xx SCSI/SAS driver is removed, it may fail to release all allocated memory. The business impact appears limited to resource leakage during driver removal, not a remotely triggered compromise based on the supplied sources.

Executive priority

Treat this as routine kernel hygiene unless the environment relies on pm80xx storage hardware or frequent module reloads. It does not currently justify emergency action based on the supplied evidence, but it should be included in normal patch cycles.

Technical view

CVE-2021-47193 affects the Linux kernel pm80xx SCSI driver. The resolved issue is a memory leak during rmmod because driver removal did not free all allocated memory. Kernel stable commits are referenced as fixes, but the supplied data does not provide CVSS, CWE, or exploitability details.

Likely exposure

Exposure is likely limited to Linux systems using the pm80xx driver, commonly tied to compatible storage controller hardware. Systems not loading this driver are unlikely to be affected. The provided affected-version data is incomplete and should be validated against the running kernel and distributor advisories.

Exploitation context

The source bundle does not show active exploitation. KEV is false, and no cited source describes weaponized use. The described trigger is driver removal, so operational impact is more plausible during module unload, reload, maintenance, or hardware-driver lifecycle events.

Researcher notes

The evidence supports a memory leak on driver removal, not privilege escalation or remote attack. Version data in the bundle is not enough for precise exposure mapping. Validate against kernel stable branches and distributor backports before declaring affected or fixed status.

Mitigation direction

  • Apply vendor or distribution kernel updates containing the referenced stable fixes.
  • Check Debian or other distributor advisories for package-specific fixed versions.
  • Prioritize systems that load the pm80xx driver or use affected storage controllers.
  • Avoid unnecessary pm80xx module removal cycles until patched.
  • Track kernel updates through normal change-control and reboot planning.

Validation and detection

  • Check whether the pm80xx kernel module is present or loaded on target systems.
  • Compare running kernel builds against vendor advisories and stable fix commits.
  • Review maintenance logs for pm80xx unload or reload activity.
  • Confirm updated kernel packages are installed and active after reboot.
  • Document unaffected systems where the driver is absent.
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-2021-47193 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
LinuxLinux5a141315ed7c2647fa4518570c4941a02588b466, 5a141315ed7c2647fa4518570c4941a02588b466, 5a141315ed7c2647fa4518570c4941a02588b466unaffected
LinuxLinux5.10, 0, 5.10.241, 5.15.5, 5.16affected
Weakness

CWE details

No CWE listed

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