{"id":"CVE-2026-89621","revision":"d1c761c83742423eace59eb67613e655","records":[{"revision":"d1c761c83742423eace59eb67613e655","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89621","aliases":[],"title":"HID: mcp2221: validate report size in mcp2221_raw_event()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nHID: mcp2221: validate report size in mcp2221_raw_event()\n\nmcp2221_raw_event() never validates the size of incoming HID reports.\nIn the MCP2221_I2C_GET_DATA path it trusts the device-supplied data[3]\nas the copy length without checking that 4 + data[3] bytes actually\nexist in the received report. A malicious or misbehaving USB device can\nsend a short report with a large data[3], causing the memcpy to read\npast the valid report data in the HID transfer buffer and leak\nuninitialized kernel memory back to userspace through the I2C/SMBus\nread path.\n\nAdd a minimum size check at entry and validate that the source range\nfits within the received report before the copy.","state":0,"publishedAt":"2026-09-11T19:45:19.42+00:00","modifiedAt":"2026-10-19T08:49:53.686+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/hid/hid-mcp2221.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"67a95c21463d066060b0f66d65a75d45bb386ffb\",\n                            \"lessThan\": \"cb38b1f149b7143355b37e86c841acf0076e5c2a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"67a95c21463d066060b0f66d65a75d45bb386ffb\",\n                            \"lessThan\": \"b2c67dc0e30c308647bbd9b9e5d69a44c9d2733d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"67a95c21463d066060b0f66d65a75d45bb386ffb\",\n                            \"lessThan\": \"fffcfa367072628c3144cca17d2a3c3c9e50c057\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"67a95c21463d066060b0f66d65a75d45bb386ffb\",\n                            \"lessThan\": \"c1c508e8923911cb458234997e55b7a4b9aa066f\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"67a95c21463d066060b0f66d65a75d45bb386ffb\",\n                            \"lessThan\": \"bdc6a3af0dd734a326acdb7d6401a3b6a9f4f149\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"67a95c21463d066060b0f66d65a75d45bb386ffb\",\n                            \"lessThan\": \"127de5919820f88a9d55e8371ad4ac49f625f4c5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"67a95c21463d066060b0f66d65a75d45bb386ffb\",\n                            \"lessThan\": \"7c18fb36708a97ff6772825cc087b6d537bbf0d5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"67a95c21463d066060b0f66d65a75d45bb386ffb\",\n                            \"lessThan\": \"2c9a6998c19503626c57a2267bf279e204113079\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/hid/hid-mcp2221.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.7\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.7\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.270\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.221\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.188\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.157\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.109\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.50\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.4\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/cb38b1f149b7143355b37e86c841acf0076e5c2a","https://git.kernel.org/stable/c/b2c67dc0e30c308647bbd9b9e5d69a44c9d2733d","https://git.kernel.org/stable/c/fffcfa367072628c3144cca17d2a3c3c9e50c057","https://git.kernel.org/stable/c/c1c508e8923911cb458234997e55b7a4b9aa066f","https://git.kernel.org/stable/c/bdc6a3af0dd734a326acdb7d6401a3b6a9f4f149","https://git.kernel.org/stable/c/127de5919820f88a9d55e8371ad4ac49f625f4c5","https://git.kernel.org/stable/c/7c18fb36708a97ff6772825cc087b6d537bbf0d5","https://git.kernel.org/stable/c/2c9a6998c19503626c57a2267bf279e204113079"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89621","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89621","identifiers":["CVE-2026-89621"]},"retained":false,"historicalAffected":[]}],"coverage":[]}