{"id":"CVE-2026-89622","summary":"HID: mcp2221: clear rxbuf after I2C/SMBus transfer completes","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nHID: mcp2221: clear rxbuf after I2C/SMBus transfer completes\n\nmcp_i2c_smbus_read() stores the caller-supplied buffer pointer in\nmcp-\u003erxbuf for the duration of a transfer but never clears it when the\ntransfer finishes or times out. Once the caller frees or reuses the\nbuffer, mcp-\u003erxbuf becomes a dangling pointer. A delayed or spurious\nMCP2221_I2C_GET_DATA report can then drive mcp2221_raw_event() to\nmemcpy device data into the freed memory, causing a write\nuse-after-free.\n\nRoute all return paths through a single exit point that clears\nmcp-\u003erxbuf and mcp-\u003erxbuf_size, so that the existing !mcp-\u003erxbuf guard\nin the raw_event handler can reject any report arriving after the\ntransfer has ended.","modified":"2026-09-13T03:47:19.610143840Z","published":"2026-09-11T19:45:20.090Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89622.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/03c34309eb1bce1b3b5f7c4a94b703f419120383"},{"type":"WEB","url":"https://git.kernel.org/stable/c/968546b676d992dd1da3e057d40598231f725996"},{"type":"WEB","url":"https://git.kernel.org/stable/c/db2333f88729c8aae062cb171ed058725ff5c901"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89622.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89622"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"67a95c21463d066060b0f66d65a75d45bb386ffb"},{"fixed":"03c34309eb1bce1b3b5f7c4a94b703f419120383"},{"fixed":"968546b676d992dd1da3e057d40598231f725996"},{"fixed":"db2333f88729c8aae062cb171ed058725ff5c901"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89622.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.7.0"},{"fixed":"6.18.51"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89622.json"}}],"schema_version":"1.9.0"}