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CVE Record

CVE-2021-47204: net: dpaa2-eth: fix use-after-free in dpaa2_eth_remove

In the Linux kernel, the following vulnerability has been resolved: net: dpaa2-eth: fix use-after-free in dpaa2_eth_remove Access to netdev after free_netdev() will cause use-after-free bug. Move debug log before free_netdev() call to avoid it.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This is a Linux kernel driver cleanup bug. During removal of the dpaa2-eth network driver, the code could reference a network device structure after it had been freed. The source bundle does not provide CVSS, CWE, or exploit evidence, so business urgency depends on whether affected Linux kernels and this driver are in use.

Executive priority

Set priority after asset validation. This is not KEV-listed and lacks severity scoring, but it affects kernel memory safety. Organizations with DPAA2 Ethernet deployments should remediate through normal kernel update channels and avoid leaving production networking hosts on affected kernels.

Technical view

CVE-2021-47204 is a use-after-free in Linux dpaa2_eth_remove. The vulnerable path accesses netdev after free_netdev(). The referenced stable fixes move the debug log before free_netdev(), avoiding post-free access. The bundle lists Linux kernel version and commit references but no CPEs or CVSS vector.

Likely exposure

Exposure is most relevant to Linux systems running affected kernels where the dpaa2-eth driver is present or used. The provided data names Linux versions and stable commits, but does not identify distributions, appliances, or cloud images. Validate through kernel package provenance and driver presence, not product assumptions.

Exploitation context

The bundle does not report active exploitation, and KEV is false. It also does not describe a remote attack path or required privileges. Treat this as a kernel memory-safety issue requiring normal vulnerability management, with urgency increased for systems using the affected driver in production networking roles.

Researcher notes

Evidence is narrow: the issue is specifically described as netdev access after free_netdev() in dpaa2_eth_remove, fixed by moving a debug log. No exploitability analysis, privilege requirement, crash impact, or distribution mapping is provided in the bundle.

Mitigation direction

  • Check Linux vendor advisories for fixed kernel packages covering this CVE.
  • Prioritize updates on systems using or loading the dpaa2-eth driver.
  • Apply kernels containing the referenced stable fixes when available from your vendor.
  • If patching is delayed, review vendor guidance for driver-specific risk reduction.
  • Track distribution backports because fixed package versions may differ from upstream versions.

Validation and detection

  • Inventory Linux kernel versions across systems that may use DPAA2 Ethernet hardware.
  • Check whether the dpaa2-eth driver is present, loaded, or packaged.
  • Map installed kernels to vendor advisories or the referenced stable commits.
  • Confirm updated kernels are booted, not merely installed.
  • Document systems where exposure cannot be confirmed from available evidence.
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-2021-47204 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: total

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
LinuxLinux7472dd9f649958be6a8880ed439233c8414a7b34, 7472dd9f649958be6a8880ed439233c8414a7b34, 7472dd9f649958be6a8880ed439233c8414a7b34, 7472dd9f649958be6a8880ed439233c8414a7b34unaffected
LinuxLinux4.17, 0, 5.4.162, 5.10.82, 5.15.5, 5.16affected
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.