{"id":"CVE-2026-89622","title":"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->rxbuf for the duration of a transfe…","summary":"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->rxbuf for the duration of a transfe…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-825"],"vendor":"Linux","product":"Linux","affected":["Linux >= 67a95c21463d066060b0f66d65a75d45bb386ffb < d6c6b293173c0ea87189501cbd77e8fa677814a1","Linux >= 67a95c21463d066060b0f66d65a75d45bb386ffb < 03c34309eb1bce1b3b5f7c4a94b703f419120383","Linux >= 67a95c21463d066060b0f66d65a75d45bb386ffb < 968546b676d992dd1da3e057d40598231f725996","Linux >= 67a95c21463d066060b0f66d65a75d45bb386ffb < db2333f88729c8aae062cb171ed058725ff5c901","Linux 5.7"],"published":"2026-09-11","updated":"2026-09-21","sourceUpdated":"2026-09-21T14:17:23.960","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-89622","references":[{"url":"https://git.kernel.org/stable/c/03c34309eb1bce1b3b5f7c4a94b703f419120383","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/968546b676d992dd1da3e057d40598231f725996","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d6c6b293173c0ea87189501cbd77e8fa677814a1","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/db2333f88729c8aae062cb171ed058725ff5c901","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89622.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89622"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532029"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89622"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89622"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89622.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat","score-dispute"],"epss":0.00157,"epssPercentile":0.0526,"scores":{"nvd":7.8,"cna":7.8,"vendor":5.5},"ingestedAt":"2026-09-14T15:23:07.474Z","slug":"CVE-2026-89622","body":"## Overview\n\nIn 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->rxbuf 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->rxbuf 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->rxbuf and mcp->rxbuf_size, so that the existing !mcp->rxbuf guard\nin the raw_event handler can reject any report arriving after the\ntransfer has ended.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89622.json)","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":208383,"id":"CVE-2026-89622","ts":1789997914393,"field":"cvss","old":"5.5","new":"7.8"},{"seq":208382,"id":"CVE-2026-89622","ts":1789997914393,"field":"severity","old":"medium","new":"high"},{"seq":202795,"id":"CVE-2026-89622","ts":1789403722519,"field":"cvss","old":"7.8","new":"5.5"},{"seq":202794,"id":"CVE-2026-89622","ts":1789403722519,"field":"severity","old":"high","new":"medium"},{"seq":153458,"id":"CVE-2026-89622","ts":1789285350592,"field":"cvss","old":null,"new":"7.8"},{"seq":153457,"id":"CVE-2026-89622","ts":1789285350592,"field":"severity","old":"none","new":"high"},{"seq":109640,"id":"CVE-2026-89622","ts":1789183732752,"field":"cvss","old":null,"new":"7"},{"seq":109639,"id":"CVE-2026-89622","ts":1789183732752,"field":"severity","old":"none","new":"high"}]}