Security readout for executives and security teams
Plain-English summary
This is a Linux kernel driver cleanup bug in the Solarflare SFC network driver. When configured for legacy IRQ interrupts, removing the module could leave an interrupt resource unreleased. The source does not show remote compromise, data exposure, or active exploitation.
Executive priority
Treat as a targeted kernel maintenance item, not an emergency, based on available sources. Prioritize systems with Solarflare SFC adapters and legacy IRQ configuration, especially production hosts where module unload or device removal occurs.
Technical view
The SFC driver failed to set irqs_hooked during legacy IRQ initialization, so module removal skipped proper IRQ release. The reported trace shows procfs IRQ cleanup warnings during efx_pci_remove and module deletion. Fixes are linked in stable kernel commits.
Likely exposure
Exposure appears limited to systems using the Linux SFC network driver with legacy IRQ mode, especially where the module is removed or devices are detached. Most environments not using this driver or interrupt mode are unlikely to be exposed.
Exploitation context
The bundle marks KEV as false and provides no cited evidence of active exploitation. The described behavior is a local driver resource cleanup failure during module removal, not a demonstrated remote attack path.
Researcher notes
Evidence is limited to the CVE description and Linux stable commit references. No CVSS, CWE, exploitability assessment, or vendor-specific package matrix is included. Validate affected status against downstream kernel backports rather than upstream version numbers alone.
Mitigation direction
- Apply the relevant Linux stable kernel update containing the referenced SFC driver fix.
- Check distribution kernel advisories for the exact fixed package version.
- Avoid legacy IRQ mode for SFC devices where operationally feasible.
- Plan remediation through normal kernel maintenance unless vendor guidance raises severity.
Validation and detection
- Identify hosts using the sfc kernel module and Solarflare network adapters.
- Check whether SFC is configured for legacy IRQ rather than MSI or MSI-X.
- Confirm kernel version or vendor package includes the referenced stable fix.
- Review logs for IRQ proc cleanup warnings during sfc module removal.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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-2021-47283 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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.
SSVC decision data
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://git.kernel.org/stable/c/8d717c9135a3340ae62d1699484850bfb4112b0cCVE reference, Linux
- https://git.kernel.org/stable/c/81c4d1d83f88e15b26f4522a35cba6ffd8c5dfddCVE reference, Linux
- https://git.kernel.org/stable/c/8f03eeb6e0a0a0b8d617ee0a4bce729e47130036CVE reference, Linux
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.