Security readout for executives and security teams
Plain-English summary
CVE-2021-47028 is a Linux kernel issue in mt76 mt7915 wireless transmit-rate reporting. The public record shows a fix for improper rate_info checking and a kernel call trace, but does not provide CVSS, clear business impact, or evidence of active exploitation.
Executive priority
Treat as targeted kernel maintenance unless your fleet depends on mt7915 wireless devices. No active exploitation or severity score is provided, so prioritize patching through normal kernel update channels with attention to exposed wireless appliances.
Technical view
The resolved defect is in Linux kernel mt76 mt7915 txrate reporting. The fix properly checks rate_info to prevent unexpected reporting that reaches cfg80211_calculate_bitrate through mac80211 transmit status handling. The source describes affected Linux kernel ranges and stable commit fixes, but impact details are limited.
Likely exposure
Exposure appears limited to Linux systems running affected kernel versions with the mt76 mt7915 driver path in use. Systems without this wireless driver or hardware are less likely exposed, but confirm through asset and kernel configuration review.
Exploitation context
The provided sources do not show active exploitation, public exploit availability, or KEV listing. The evidence is a Linux kernel fix record and call trace, so exploitation likelihood and attacker requirements are not established from the bundle.
Researcher notes
The record identifies a code-quality fix around rate_info validation, not a fully described exploit primitive. Validate exposure by kernel lineage and driver usage. Avoid assuming remote code execution, privilege escalation, or denial of service without additional vendor evidence.
Mitigation direction
- Apply Linux kernel updates containing the referenced stable fixes.
- Check distribution or appliance vendor advisories for backported kernel fixes.
- Prioritize systems using mt76 mt7915 wireless functionality.
- Track remediation by kernel package version and included commit backports.
Validation and detection
- Inventory Linux hosts running affected kernel versions.
- Confirm whether mt76 mt7915 driver support is present or loaded.
- Verify the kernel includes one referenced stable fix or vendor backport.
- Review kernel logs for similar cfg80211, mac80211, or mt7915 call traces.
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-2021-47028 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/dfc8a71448c7d4fec38fb22bdc8a76d79c14b6daCVE reference, Linux
- https://git.kernel.org/stable/c/4bd926e5ca88eac4d95eacb806b229f8729bc62eCVE reference, Linux
- https://git.kernel.org/stable/c/f43b941fd61003659a3f0e039595e5e525917aa8CVE 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.