Security readout for executives and security teams
Plain-English summary
This Linux kernel issue can crash affected systems during suspend when a MediaTek MT7921 PCIe wireless driver accesses registers after the PCIe controller is suspended. The reported impact is availability loss through kernel panic, not data theft.
Executive priority
Treat as a targeted availability issue. Prioritize routine kernel remediation where affected MT7921 hardware exists, especially for managed endpoint fleets, but do not treat as emergency exploitation without new evidence.
Technical view
The mt76 mt7921 driver could leave pending IRQ tasklet work after suspend. That tasklet could perform MMIO register reads against a suspended PCIe controller, causing a fatal interrupt exception and kernel panic. The source references stable kernel commits that disable interrupts and synchronize pending IRQ handlers.
Likely exposure
Exposure appears limited to Linux systems using the mt7921e MediaTek MT7921 PCIe wireless driver on affected kernel versions or unpatched downstream builds.
Exploitation context
The bundle reports no KEV listing and provides no evidence of active exploitation. The triggering condition described is suspend-time driver behavior involving pending interrupts, suggesting reliability risk on affected hardware.
Researcher notes
The CVE data lacks CVSS, CWE, and detailed version range clarity. Analysis is based on the kernel description and two stable commit references. Validate against downstream distro backports rather than assuming mainline version labels map directly.
Mitigation direction
- Apply a Linux kernel update containing the referenced stable fixes.
- Check distribution kernel advisories for backported fixes to supported releases.
- Prioritize affected laptops, embedded devices, or appliances using MT7921 PCIe Wi-Fi.
- If impacted, follow vendor guidance; no temporary workaround is specified in the sources.
Validation and detection
- Inventory systems for MediaTek MT7921 PCIe wireless hardware and mt7921e driver usage.
- Compare deployed kernel versions against vendor advisories and fixed stable commits.
- Review suspend or resume crash logs for mt7921e, mt76_mmio_rr, or kernel panic traces.
- Confirm updated systems no longer reproduce suspend-related kernel panics.
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-2021-47019 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/b13cbc536990ff609afa878b6211cd6f6265ba60CVE reference, Linux
- https://git.kernel.org/stable/c/fe3fccde8870764ba3e60610774bd7bc9f8faeffCVE 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.