{"id":"CVE-2026-89621","state":"PUBLISHED","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.","publishedAt":"2026-09-11T19:45:19.420Z","updatedAt":"2026-10-19T08:49:53.686Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"67a95c21463d066060b0f66d65a75d45bb386ffb","status":"affected","lessThan":"cb38b1f149b7143355b37e86c841acf0076e5c2a","versionType":"git"},{"version":"67a95c21463d066060b0f66d65a75d45bb386ffb","status":"affected","lessThan":"b2c67dc0e30c308647bbd9b9e5d69a44c9d2733d","versionType":"git"},{"version":"67a95c21463d066060b0f66d65a75d45bb386ffb","status":"affected","lessThan":"fffcfa367072628c3144cca17d2a3c3c9e50c057","versionType":"git"},{"version":"67a95c21463d066060b0f66d65a75d45bb386ffb","status":"affected","lessThan":"c1c508e8923911cb458234997e55b7a4b9aa066f","versionType":"git"},{"version":"67a95c21463d066060b0f66d65a75d45bb386ffb","status":"affected","lessThan":"bdc6a3af0dd734a326acdb7d6401a3b6a9f4f149","versionType":"git"},{"version":"67a95c21463d066060b0f66d65a75d45bb386ffb","status":"affected","lessThan":"127de5919820f88a9d55e8371ad4ac49f625f4c5","versionType":"git"},{"version":"67a95c21463d066060b0f66d65a75d45bb386ffb","status":"affected","lessThan":"7c18fb36708a97ff6772825cc087b6d537bbf0d5","versionType":"git"},{"version":"67a95c21463d066060b0f66d65a75d45bb386ffb","status":"affected","lessThan":"2c9a6998c19503626c57a2267bf279e204113079","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/hid/hid-mcp2221.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.7","versionType":"semver"},{"version":"5.10.270","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.109","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.50","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.4","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/hid/hid-mcp2221.c"]}],"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"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:26.108Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/89xxx/CVE-2026-89621.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-89621","state":"PUBLISHED","datePublished":"2026-09-11T19:45:19.420Z","dateUpdated":"2026-10-19T08:49:53.686Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.736Z"},"containers":{"cna":{"title":"HID: mcp2221: validate report size in mcp2221_raw_event()","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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"67a95c21463d066060b0f66d65a75d45bb386ffb","status":"affected","lessThan":"cb38b1f149b7143355b37e86c841acf0076e5c2a","versionType":"git"},{"version":"67a95c21463d066060b0f66d65a75d45bb386ffb","status":"affected","lessThan":"b2c67dc0e30c308647bbd9b9e5d69a44c9d2733d","versionType":"git"},{"version":"67a95c21463d066060b0f66d65a75d45bb386ffb","status":"affected","lessThan":"fffcfa367072628c3144cca17d2a3c3c9e50c057","versionType":"git"},{"version":"67a95c21463d066060b0f66d65a75d45bb386ffb","status":"affected","lessThan":"c1c508e8923911cb458234997e55b7a4b9aa066f","versionType":"git"},{"version":"67a95c21463d066060b0f66d65a75d45bb386ffb","status":"affected","lessThan":"bdc6a3af0dd734a326acdb7d6401a3b6a9f4f149","versionType":"git"},{"version":"67a95c21463d066060b0f66d65a75d45bb386ffb","status":"affected","lessThan":"127de5919820f88a9d55e8371ad4ac49f625f4c5","versionType":"git"},{"version":"67a95c21463d066060b0f66d65a75d45bb386ffb","status":"affected","lessThan":"7c18fb36708a97ff6772825cc087b6d537bbf0d5","versionType":"git"},{"version":"67a95c21463d066060b0f66d65a75d45bb386ffb","status":"affected","lessThan":"2c9a6998c19503626c57a2267bf279e204113079","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/hid/hid-mcp2221.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.7","versionType":"semver"},{"version":"5.10.270","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.109","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.50","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.4","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/hid/hid-mcp2221.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/cb38b1f149b7143355b37e86c841acf0076e5c2a"},{"url":"https://git.kernel.org/stable/c/b2c67dc0e30c308647bbd9b9e5d69a44c9d2733d"},{"url":"https://git.kernel.org/stable/c/fffcfa367072628c3144cca17d2a3c3c9e50c057"},{"url":"https://git.kernel.org/stable/c/c1c508e8923911cb458234997e55b7a4b9aa066f"},{"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T08:49:53.686Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"5.10.270"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"5.15.221"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"6.1.188"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"6.6.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"6.12.109"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"6.18.50"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"7.2.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}