Security readout for executives and security teams
Plain-English summary
CVE-2022-49522 is a Linux kernel issue in the jz4740 MMC storage driver. The driver could ask the DMA engine to handle a data segment larger than it says it supports, causing kernel DMA debug warnings. Public sources do not describe active exploitation, data theft, or privilege escalation.
Executive priority
Handle through normal Linux maintenance unless your organization ships or operates embedded Linux devices using this MMC hardware path. For those devices, confirm vendor patch availability and include it in the next firmware or kernel update cycle.
Technical view
The jz4740 MMC host driver failed to limit maximum segment size according to DMA engine capabilities. The kernel fix applies DMA limits similarly to other DMA-enabled MMC host drivers. The documented symptom is a DMA-API debug warning during MMC block I/O when a scatter-gather segment exceeds the DMA controller maximum.
Likely exposure
Exposure appears limited to Linux systems using the jz4740 MMC host driver with DMA-enabled MMC storage, likely embedded or SoC-based devices. The CVE record lists Linux kernel versions as affected, but does not provide product-specific distribution impact.
Exploitation context
No cited source reports active exploitation, public exploit code, or KEV listing. The available record describes a correctness and kernel DMA API limit issue, with observed warnings under CONFIG_DMA_API_DEBUG. Security impact beyond this is not clearly documented in the provided sources.
Researcher notes
The record lacks CVSS, CWE, and a clear exploitability statement. Analysis should focus on kernel versions, driver reachability, and whether the stable commits are present. Avoid assuming broad server exposure without evidence that the jz4740 MMC driver is used.
Mitigation direction
- Update to a Linux kernel or vendor package containing the referenced stable fixes.
- For appliances or embedded devices, request patched firmware guidance from the vendor.
- Prioritize systems using jz4740/jz4780 MMC storage paths.
Validation and detection
- Inventory Linux kernel versions on potentially affected embedded systems.
- Check whether the jz4740 MMC host driver is present or enabled.
- Review vendor changelogs for CVE-2022-49522 or the referenced kernel commits.
- If debug kernels are used, review logs for DMA-API segment-size warnings.
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-2022-49522 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.
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.
Source materials
- CVE List V5 sourceCVE List V5
- https://git.kernel.org/stable/c/7923f95997a79cef2ad161a2facae64c25a0bca0CVE reference, Linux
- https://git.kernel.org/stable/c/90281cadf5077f2d2bec8b08c2ead1f8cd12660eCVE reference, Linux
- https://git.kernel.org/stable/c/353298cadbd4c7d8e8a16d6000066414694933c3CVE reference, Linux
- https://git.kernel.org/stable/c/807f90f1960a59dc557542b818c484a8db9ac978CVE reference, Linux
- https://git.kernel.org/stable/c/a828920b9ec0d89d3011198d482b7fe224d2de19CVE reference, Linux
- https://git.kernel.org/stable/c/afadb04f1d6e74b18a253403f5274cde5e3fd7bdCVE 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.