Security readout for executives and security teams
Plain-English summary
CVE-2021-47484 is a Linux kernel reliability flaw: a possible null pointer dereference in octeontx2-af code. The published impact is denial of service, not data theft or privilege escalation. An attacker would need local low-privileged access, so urgency depends on whether affected kernels run on systems with untrusted local users or workloads.
Executive priority
Schedule this in normal kernel patching, with faster action for shared Linux hosts or environments running untrusted workloads. Business risk is service disruption, not confirmed compromise or data exposure based on supplied evidence.
Technical view
The issue is CWE-476 in the Linux kernel octeontx2-af driver, affecting rvu_debugfs.c and rvu_nix.c. CVSS 3.1 is 5.5 with local attack vector, low complexity, low privileges, no user interaction, and high availability impact. The record references Linux stable commits as the resolution.
Likely exposure
Exposure is likely limited to Linux systems running affected kernel versions where octeontx2-af code is present and reachable. The source bundle lists Linux kernel version boundaries including 5.5, 5.14.16, and 5.15, but distro backports can change practical exposure.
Exploitation context
The CVE is not listed in KEV, and the supplied sources do not claim active exploitation. The CVSS vector indicates local, low-privileged exploitation with availability impact only. Treat internet-facing risk as indirect unless attackers can obtain local execution on affected hosts.
Researcher notes
Evidence is limited to the CVE record and two Linux stable commit references. The record describes a fixed null pointer dereference in rvu_debugfs.c and rvu_nix.c but does not provide public exploit details or operational mitigations beyond applying fixed kernel code.
Mitigation direction
- Update to a vendor-supported kernel containing the referenced Linux stable fixes.
- Check Linux distribution advisories for backported fixes before relying on upstream version numbers.
- Prioritize multi-user hosts and systems running untrusted local workloads.
- Restrict unnecessary local access until patched where affected systems are confirmed.
Validation and detection
- Inventory kernel versions across Linux hosts and compare against vendor advisory status.
- Confirm whether affected hosts include or load octeontx2-af-related kernel code.
- Map deployed kernels to the referenced Linux stable fix commits or distro backports.
- Review crash telemetry for kernel oops or panic events involving octeontx2-af paths.
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.
CWE-476: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-47484 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
- Medium
- CVSS
- 5.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H1.83.6CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
5.5MediumVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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/f1e3cd1cc80204fd02b9e9843450925a2af90dc0CVE reference, Linux
- https://git.kernel.org/stable/c/c2d4c543f74c90f883e8ec62a31973ae8807d354CVE 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.
NULL Pointer Dereference
NULL Pointer Dereference represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.