{"api_version":"1","generated_at":"2026-09-14T04:18:08+00:00","cve":"CVE-2026-89621","urls":{"html":"https://cve.report/CVE-2026-89621","api":"https://cve.report/api/cve/CVE-2026-89621.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-89621","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-89621"},"summary":{"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":"PUBLISHED","assigner":"Linux","published_at":"2026-09-11 20:19:47","updated_at":"2026-09-11 20:19:47"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/2c9a6998c19503626c57a2267bf279e204113079","name":"https://git.kernel.org/stable/c/2c9a6998c19503626c57a2267bf279e204113079","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/bdc6a3af0dd734a326acdb7d6401a3b6a9f4f149","name":"https://git.kernel.org/stable/c/bdc6a3af0dd734a326acdb7d6401a3b6a9f4f149","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7c18fb36708a97ff6772825cc087b6d537bbf0d5","name":"https://git.kernel.org/stable/c/7c18fb36708a97ff6772825cc087b6d537bbf0d5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/127de5919820f88a9d55e8371ad4ac49f625f4c5","name":"https://git.kernel.org/stable/c/127de5919820f88a9d55e8371ad4ac49f625f4c5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89621","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89621","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 67a95c21463d066060b0f66d65a75d45bb386ffb bdc6a3af0dd734a326acdb7d6401a3b6a9f4f149 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 67a95c21463d066060b0f66d65a75d45bb386ffb 127de5919820f88a9d55e8371ad4ac49f625f4c5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 67a95c21463d066060b0f66d65a75d45bb386ffb 7c18fb36708a97ff6772825cc087b6d537bbf0d5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 67a95c21463d066060b0f66d65a75d45bb386ffb 2c9a6998c19503626c57a2267bf279e204113079 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.7","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.7 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.109 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.50 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.4 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"89621","cve":"CVE-2026-89621","epss":"0.002090000","percentile":"0.111270000","score_date":"2026-09-13","updated_at":"2026-09-14 00:18:02"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/hid/hid-mcp2221.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"bdc6a3af0dd734a326acdb7d6401a3b6a9f4f149","status":"affected","version":"67a95c21463d066060b0f66d65a75d45bb386ffb","versionType":"git"},{"lessThan":"127de5919820f88a9d55e8371ad4ac49f625f4c5","status":"affected","version":"67a95c21463d066060b0f66d65a75d45bb386ffb","versionType":"git"},{"lessThan":"7c18fb36708a97ff6772825cc087b6d537bbf0d5","status":"affected","version":"67a95c21463d066060b0f66d65a75d45bb386ffb","versionType":"git"},{"lessThan":"2c9a6998c19503626c57a2267bf279e204113079","status":"affected","version":"67a95c21463d066060b0f66d65a75d45bb386ffb","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/hid/hid-mcp2221.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.7"},{"lessThan":"5.7","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.109","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.50","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.4","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.109","versionStartIncluding":"5.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.50","versionStartIncluding":"5.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.4","versionStartIncluding":"5.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"5.7","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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."}],"providerMetadata":{"dateUpdated":"2026-09-11T19:45:19.420Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/bdc6a3af0dd734a326acdb7d6401a3b6a9f4f149"},{"url":"https://git.kernel.org/stable/c/127de5919820f88a9d55e8371ad4ac49f625f4c5"},{"url":"https://git.kernel.org/stable/c/7c18fb36708a97ff6772825cc087b6d537bbf0d5"},{"url":"https://git.kernel.org/stable/c/2c9a6998c19503626c57a2267bf279e204113079"}],"title":"HID: mcp2221: validate report size in mcp2221_raw_event()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-89621","datePublished":"2026-09-11T19:45:19.420Z","dateReserved":"2026-09-11T19:38:34.736Z","dateUpdated":"2026-09-11T19:45:19.420Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-11 20:19:47","lastModifiedDate":"2026-09-11 20:19:47","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"89621","Ordinal":"1","Title":"HID: mcp2221: validate report size in mcp2221_raw_event()","CVE":"CVE-2026-89621","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"89621","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"HID: mcp2221: validate report size in mcp2221_raw_event()"}]}}}