Security readout for executives and security teams
Plain-English summary
This Linux kernel issue is a memory leak in the octeontx2-af driver initialization path. The public record does not provide CVSS, impact severity, or evidence of exploitation. Treat it as a narrow kernel maintenance risk unless your fleet uses affected Linux versions with this driver enabled.
Executive priority
Schedule routine remediation through normal kernel patch cycles, with higher priority only for systems using this driver. There is no source-supported evidence of active exploitation or broad internet-facing exposure.
Technical view
In rvu_mbox_init(), mbox_regions was not freed or returned on a switch-default error path, causing a potential memory leak. The fix changes the error return to a cleanup path. The issue was found by static analysis, cross-reviewed, and may be hard to trigger or a false positive.
Likely exposure
Exposure appears limited to Linux kernels in the listed affected ranges or commits where octeontx2-af is built or used, including CONFIG_OCTEONTX2_AF=y builds. Distribution backports may change practical exposure, so kernel package provenance matters.
Exploitation context
The source bundle reports no CISA KEV listing and gives no public exploitation evidence. It also states the bug came from static analysis and may be hard to trigger or a false positive.
Researcher notes
The key code path is rvu_mbox_init() in octeontx2-af. Validate whether mbox_regions cleanup reaches the switch-default error path. Avoid assuming exploitability from the CVE alone because the record flags static-analysis uncertainty.
Mitigation direction
- Check distribution advisories for CVE-2021-47537 coverage.
- Update to a kernel containing the referenced stable fixes.
- Prioritize systems with octeontx2-af enabled or built in.
- Track vendor kernel backports rather than relying only on version strings.
Validation and detection
- Inventory Linux kernel versions and package build provenance.
- Check whether CONFIG_OCTEONTX2_AF is enabled in deployed kernels.
- Confirm the stable fix commits are present or backported.
- Review kernel vendor notes for affected package ranges.
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-2021-47537 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/1c0ddef45b7e3dbe3ed073695d20faa572b7056aCVE reference, Linux
- https://git.kernel.org/stable/c/e07a097b4986afb8f925d0bb32612e1d3e88ce15CVE 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.