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CVE Record

CVE-2022-50131: HID: mcp2221: prevent a buffer overflow in mcp_smbus_write()

In the Linux kernel, the following vulnerability has been resolved: HID: mcp2221: prevent a buffer overflow in mcp_smbus_write() Smatch Warning: drivers/hid/hid-mcp2221.c:388 mcp_smbus_write() error: __memcpy() '&mcp->txbuf[5]' too small (59 vs 255) drivers/hid/hid-mcp2221.c:388 mcp_smbus_write() error: __memcpy() 'buf' too small (34 vs 255) The 'len' variable can take a value between 0-255 as it can come from data->block[0] and it is user data. So add an bound check to prevent a buffer overflow in memcpy().

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2022-50131 is a Linux kernel bug in the MCP2221 HID driver. A user-controlled length value could overflow a buffer during an SMBus write. Business urgency depends on whether affected kernels and this driver/device path are present. No active exploitation is reported in the provided sources.

Executive priority

Treat as a targeted kernel-maintenance issue, not an internet-wide emergency based on current evidence. Prioritize patch validation where Linux systems use MCP2221-related hardware or custom kernels. Keep it in regular kernel update cycles if the driver is absent or unreachable.

Technical view

The flaw is in drivers/hid/hid-mcp2221.c, mcp_smbus_write(). The CVE notes len can be 0-255 from data->block[0], while memcpy destinations/sources are smaller. Kernel stable commits add a bounds check to prevent overflow. CVSS, CWE, and complete impact details are not provided.

Likely exposure

Likely exposure is Linux systems running affected kernel versions with the MCP2221 HID driver reachable. This appears tied to a kernel hardware-driver path, not a general network service. Distribution backports may change exposure, so validate against vendor kernel advisories and package changelogs.

Exploitation context

The source bundle does not show CISA KEV listing, public exploitation, or exploit availability. The plausible risk is kernel memory corruption when the vulnerable driver processes oversized user-controlled block length data. Practical exploitability and privileges required are not specified in the provided sources.

Researcher notes

Evidence is limited to the CVE record and kernel stable commits. The affected-version data in the bundle is not fully normalized, so avoid relying only on raw version strings. Validate by commit presence, distribution advisory status, and whether the driver path is enabled.

Mitigation direction

  • Update to a vendor kernel containing the referenced stable fix.
  • Check Linux distribution advisories for backported patches and supported package versions.
  • If updates are delayed, consult vendor guidance for safe interim controls.
  • Prioritize systems where MCP2221 hardware or the hid-mcp2221 driver is used.

Validation and detection

  • Inventory Linux kernel versions across servers, workstations, and embedded systems.
  • Check whether hid-mcp2221 is built, loaded, or packaged in target kernels.
  • Confirm installed kernel includes one of the referenced stable commits or a distro backport.
  • Review vendor changelogs for CVE-2022-50131 or the MCP2221 bounds-check fix.
Prepared
Confidence
medium
Sources
7

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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.

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CVE-2022-50131 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

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.

0CVSS vectors
3Timeline events
0ADP providers
6Source links

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux67a95c21463d066060b0f66d65a75d45bb386ffb, 67a95c21463d066060b0f66d65a75d45bb386ffb, 67a95c21463d066060b0f66d65a75d45bb386ffb, 67a95c21463d066060b0f66d65a75d45bb386ffb, 67a95c21463d066060b0f66d65a75d45bb386ffbunaffected
LinuxLinux5.7, 0, 5.10.137, 5.15.61, 5.18.18, 5.19.2, 6.0affected
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.