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CVE Record

CVE-2021-47216: scsi: advansys: Fix kernel pointer leak

In the Linux kernel, the following vulnerability has been resolved: scsi: advansys: Fix kernel pointer leak Pointers should be printed with %p or %px rather than cast to 'unsigned long' and printed with %lx. Change %lx to %p to print the hashed pointer.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysislow

Security readout for executives and security teams

Plain-English summary

This Linux kernel issue could expose raw kernel pointer values through the advansys SCSI driver’s logging. That kind of leak is usually not a direct breach, but it can weaken protections such as address randomization if combined with another bug.

Executive priority

Treat this as routine kernel hygiene unless affected systems handle sensitive workloads or run unsupported kernels. It is worth fixing, but the supplied evidence does not support emergency response.

Technical view

The advansys SCSI driver printed pointer values using an integer format instead of the kernel’s pointer-safe format. The upstream fix changes the output to use hashed pointer printing. The source bundle does not provide CVSS, CWE, or a complete affected-version range.

Likely exposure

Exposure is most likely on Linux systems that include and use the advansys SCSI driver on affected kernel branches. Many modern environments may have no practical exposure if this legacy SCSI driver is absent or unused.

Exploitation context

The bundle marks KEV as false and provides no cited evidence of active exploitation. This is an information disclosure issue, not a standalone remote code execution finding based on the supplied sources.

Researcher notes

The fix addresses pointer formatting only: %lx output of a cast pointer is replaced with %p hashed pointer output. Affected-version data in the bundle appears flattened, so use upstream commits and distro backports for precise validation.

Mitigation direction

  • Update to a vendor kernel containing the referenced stable fixes.
  • Check distribution advisories for backported fixes on supported kernels.
  • Remove or disable the advansys driver if it is unnecessary.
  • Prioritize normally unless exposed systems are high sensitivity.

Validation and detection

  • Inventory Linux kernels and compare them with vendor fixed builds.
  • Check whether the advansys driver is built, packaged, or loaded.
  • Review kernel changelogs for the referenced stable commits.
  • Confirm no unsupported kernels remain in production.
Prepared
Confidence
medium
Sources
10

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-2021-47216 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
9Source 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
LinuxLinux31491e1ac425edc6b80a670a71ac8d2dfdd78417, 31491e1ac425edc6b80a670a71ac8d2dfdd78417, 31491e1ac425edc6b80a670a71ac8d2dfdd78417, 31491e1ac425edc6b80a670a71ac8d2dfdd78417, 31491e1ac425edc6b80a670a71ac8d2dfdd78417, 31491e1ac425edc6b80a670a71ac8d2dfdd78417, 31491e1ac425edc6b80a670a71ac8d2dfdd78417, 31491e1ac425edc6b80a670a71ac8d2dfdd78417unaffected
LinuxLinux3.10, 0, 4.4.293, 4.9.291, 4.14.256, 4.19.218, 5.4.162, 5.10.82, 5.15.5, 5.16affected
Weakness

CWE details

No CWE listed

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