Answer in brief
CVE-2026-89621 records a Unknown severity vulnerability in HID: mcp2221: validate report size in mcp2221_raw_event(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=67a95c21463d066060b0f66d65a75d45bb386ffb <bdc6a3af0dd734a326acdb7d6401a3b6a9f4f149 || >=67a95c21463d066060b0f66d65a75d45bb386ffb <127de5919820f88a9d55e8371ad4ac49f625f4c5 || >=67a95c21463d066060b0f66d65a75d45bb386ffb <7c18fb36708a97ff6772825cc087b6d537bbf0d5 || >=67a95c21463d066060b0f66d65a75d45bb386ffb <2c9a6998c19503626c57a2267bf279e204113079 | bdc6a3af0dd734a326acdb7d6401a3b6a9f4f149, 127de5919820f88a9d55e8371ad4ac49f625f4c5, 7c18fb36708a97ff6772825cc087b6d537bbf0d5, 2c9a6998c19503626c57a2267bf279e204113079 |
| Linux/Linuxgeneric | 5.7 | Not reported |
| Linux/Linuxgeneric | >=67a95c21463d066060b0f66d65a75d45bb386ffb <cb38b1f149b7143355b37e86c841acf0076e5c2a || >=67a95c21463d066060b0f66d65a75d45bb386ffb <b2c67dc0e30c308647bbd9b9e5d69a44c9d2733d || >=67a95c21463d066060b0f66d65a75d45bb386ffb <fffcfa367072628c3144cca17d2a3c3c9e50c057 || >=67a95c21463d066060b0f66d65a75d45bb386ffb <c1c508e8923911cb458234997e55b7a4b9aa066f || >=67a95c21463d066060b0f66d65a75d45bb386ffb <bdc6a3af0dd734a326acdb7d6401a3b6a9f4f149 || >=67a95c21463d066060b0f66d65a75d45bb386ffb <127de5919820f88a9d55e8371ad4ac49f625f4c5 || >=67a95c21463d066060b0f66d65a75d45bb386ffb <7c18fb36708a97ff6772825cc087b6d537bbf0d5 || >=67a95c21463d066060b0f66d65a75d45bb386ffb <2c9a6998c19503626c57a2267bf279e204113079 | cb38b1f149b7143355b37e86c841acf0076e5c2a, b2c67dc0e30c308647bbd9b9e5d69a44c9d2733d, fffcfa367072628c3144cca17d2a3c3c9e50c057, c1c508e8923911cb458234997e55b7a4b9aa066f, bdc6a3af0dd734a326acdb7d6401a3b6a9f4f149, 127de5919820f88a9d55e8371ad4ac49f625f4c5, 7c18fb36708a97ff6772825cc087b6d537bbf0d5, 2c9a6998c19503626c57a2267bf279e204113079 |
Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 11, 2026
In the Linux kernel, the following vulnerability has been resolved: HID: mcp2221: validate report size in mcp2221_raw_event() mcp2221_raw_event() never validates the size of incoming HID reports. In the MCP2221_I2C_GET_DATA path it trusts the device-supplied data[3] as the copy length without checking that 4 + data[3] bytes actually exist in the received report. A malicious or misbehaving USB device can send a short report with a large data[3], causing the memcpy to read past the valid report data in the HID transfer buffer and leak uninitialized kernel memory back to userspace through the I2C/SMBus read path. Add a minimum size check at entry and validate that the source range fits within the received report before the copy.
Quoted source text, attributed separately from HOL analysis.