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CVE Record

CVE-2021-47048: spi: spi-zynqmp-gqspi: fix use-after-free in zynqmp_qspi_exec_op

In the Linux kernel, the following vulnerability has been resolved: spi: spi-zynqmp-gqspi: fix use-after-free in zynqmp_qspi_exec_op When handling op->addr, it is using the buffer "tmpbuf" which has been freed. This will trigger a use-after-free KASAN warning. Let's use temporary variables to store op->addr.val and op->cmd.opcode to fix this issue.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2021-47048 is a Linux kernel memory safety bug in the spi-zynqmp-gqspi driver. The driver could reuse a freed temporary buffer while handling SPI operation address data, producing a use-after-free condition. Public sources do not provide CVSS, impact detail, or evidence of active exploitation.

Executive priority

Give this medium priority for embedded or appliance fleets using affected Linux kernels and this SPI driver. For general server fleets without this driver path, urgency is lower, but kernel maintenance should still track vendor fixes.

Technical view

The issue is in zynqmp_qspi_exec_op. When processing op->addr, code referenced tmpbuf after it had been freed. The resolved fix stores op->addr.val and op->cmd.opcode in temporary variables before freeing the buffer. The source identifies affected Linux kernel version ranges but provides limited normalized version detail.

Likely exposure

Exposure appears limited to Linux systems running affected kernel builds that include and exercise the spi-zynqmp-gqspi driver. The bundle references Linux 5.10, 5.11, 5.12, and 5.13-related version data, but exact downstream vendor package exposure must be confirmed from vendor advisories.

Exploitation context

The source bundle does not cite public exploitation, proof-of-concept activity, or CISA KEV listing. It only describes a KASAN-detectable use-after-free in kernel driver code. Treat exploitability and operational impact as unconfirmed from the provided evidence.

Researcher notes

The evidence supports a resolved kernel use-after-free, not a proven exploitable attack path. The affected-version data in the bundle is sparse and partly normalized poorly, so validate against CVE JSON and upstream stable commits before declaring specific products affected.

Mitigation direction

  • Check Linux distribution or device vendor guidance for fixed kernel packages.
  • Prioritize updates on systems using the spi-zynqmp-gqspi driver.
  • Review the referenced stable kernel commits when maintaining custom kernels.
  • If patching is delayed, reduce reliance on affected hardware paths where feasible.

Validation and detection

  • Inventory deployed kernel versions across relevant Linux systems.
  • Determine whether spi-zynqmp-gqspi is built, loaded, or used.
  • Compare custom kernels with the referenced upstream stable commits.
  • Confirm vendor kernel packages include the upstream fix.
  • Monitor logs or testing for KASAN use-after-free findings if enabled.
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-2021-47048 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

CVECVE Program Container
CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux1c26372e5aa9e53391a1f8fe0dc7cd93a7e5ba9e, 1c26372e5aa9e53391a1f8fe0dc7cd93a7e5ba9e, 1c26372e5aa9e53391a1f8fe0dc7cd93a7e5ba9e, 1c26372e5aa9e53391a1f8fe0dc7cd93a7e5ba9eunaffected
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.