Security readout for executives and security teams
Plain-English summary
This is a Linux kernel availability bug in the Sunplus USB PHY driver. If the driver probes a device without an expected platform resource, it can dereference a null pointer and crash kernel code. Business impact is mainly denial of service on affected Linux systems, especially embedded or appliance-like deployments using Sunplus USB PHY support.
Executive priority
Treat this as a moderate availability risk. It should not displace actively exploited internet-facing issues, but it matters for embedded, appliance, or operational systems where a kernel crash creates service interruption or recovery cost.
Technical view
sp_usb_phy_probe() calls platform_get_resource_byname(), which can return NULL. The vulnerable path then uses usbphy->moon4_res_mem->start in devm_ioremap(), causing a potential NULL pointer dereference. The CVSS vector is local, low complexity, low privileges, no user interaction, unchanged scope, and high availability impact only.
Likely exposure
Exposure appears limited to Linux kernels identified in the CVE data, particularly 6.1/6.2 lineage systems where the Sunplus USB PHY driver and relevant platform resources are present. General Linux servers without this driver or hardware path are less likely to be exposed, but downstream vendor backports must be checked.
Exploitation context
The source bundle does not indicate active exploitation, and KEV is false. The scored attack model is local with low privileges and no user interaction, causing availability impact rather than data theft or integrity compromise. Public sources provided do not describe exploit tooling or real-world abuse.
Researcher notes
Evidence is narrow and kernel-source focused. The vulnerability is a missing NULL check in a hardware-specific probe path, fixed by checking platform_get_resource_byname() before dereferencing the resource. No confidentiality or integrity impact is claimed in the supplied CVSS data.
Mitigation direction
- Update to a kernel build containing the referenced stable fixes.
- Use distribution or appliance vendor advisories to confirm backported fixes.
- Prioritize embedded systems using Sunplus USB PHY hardware or board support.
- If updates are unavailable, ask the vendor for supported mitigation guidance.
- Track affected assets until the fixed kernel is deployed.
Validation and detection
- Inventory Linux kernel versions against the CVE affected-version data.
- Check vendor changelogs for commits d838b5c99bce or 17eee264ef38.
- Confirm whether Sunplus USB PHY support is enabled or applicable.
- Review crash logs for NULL pointer dereferences during USB PHY probe.
- Verify patched systems include the platform resource NULL check.
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
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ATT&CK lookup starting points
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CWE-476: Exact CWE lookup
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Open ATT&CK lookupCVE-2022-49756 mapping review
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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/d838b5c99bcecd593b4710a93fce8fdbf122395bCVE reference, Linux
- https://git.kernel.org/stable/c/17eee264ef386ef30a69dd70e36f29893b85c170CVE 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.