{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-50131", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-06-18T10:57:27.418Z", "datePublished": "2025-06-18T11:02:56.796Z", "dateUpdated": "2026-08-05T08:57:29.234Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:57:29.234Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: mcp2221: prevent a buffer overflow in mcp_smbus_write()\n\nSmatch Warning:\ndrivers/hid/hid-mcp2221.c:388 mcp_smbus_write() error: __memcpy()\n'&mcp->txbuf[5]' too small (59 vs 255)\ndrivers/hid/hid-mcp2221.c:388 mcp_smbus_write() error: __memcpy() 'buf'\ntoo small (34 vs 255)\n\nThe 'len' variable can take a value between 0-255 as it can come from\ndata->block[0] and it is user data. So add an bound check to prevent a\nbuffer overflow in memcpy()." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The overflow is reached via the local i2c-dev I2C_SMBUS ioctl into mcp_smbus_xfer()/mcp_smbus_write(), not by crafted USB HID reports. An attached MCP2221 is a deployment precondition; the attack is a local syscall against /dev/i2c-N.\nAC:L - An attacker who can open the adapter sets data->block[0] above I2C_SMBUS_BLOCK_MAX and triggers memcpy into txbuf[64] on the write path before any USB/I2C slave response, so no race or external state is required.\nPR:L - i2cdev_open() has no capability check; access depends on /dev/i2c-* permissions (commonly 0660 root:i2c or equivalent on embedded/industrial systems), which is basic local access rather than real root.\nUI:N - Exploitation needs only ioctl(I2C_SMBUS) with an oversized block write (I2C_SMBUS_BLOCK_DATA / I2C_SMBUS_I2C_BLOCK_DATA / BLOCK_PROC_CALL); no victim interaction is required.\nS:U - This is ordinary host-kernel heap memory corruption (local privilege escalation/DoS) with no VM escape, IOMMU bypass, or other cross-authority impact.\nC:H - Oversized memcpy into mcp->txbuf overflows the heap-allocated struct mcp2221 and adjacent heap, a memory-corruption primitive that can be leveraged for information disclosure.\nI:H - Out-of-bounds heap write of up to ~196 bytes past txbuf (controlled length from data->block[0]) can corrupt adjacent state including pointers (e.g. gc) and enable integrity compromise/control-flow hijacking.\nA:H - The same heap corruption can oops or panic the kernel even when not fully exploited for code execution." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/hid/hid-mcp2221.c" ], "versions": [ { "version": "67a95c21463d066060b0f66d65a75d45bb386ffb", "lessThan": "66c8e816f2f2ca4a61b406503bd10bad1b35f72f", "status": "affected", "versionType": "git" }, { "version": "67a95c21463d066060b0f66d65a75d45bb386ffb", "lessThan": "91443c669d280937968f0aa4edefa741cfe35314", "status": "affected", "versionType": "git" }, { "version": "67a95c21463d066060b0f66d65a75d45bb386ffb", "lessThan": "6402116a7b5ec80fa40fd145a80c813019cd555f", "status": "affected", "versionType": "git" }, { "version": "67a95c21463d066060b0f66d65a75d45bb386ffb", "lessThan": "3c0f8a59f2cc8841ee6653399a77f4f3e6e9a270", "status": "affected", "versionType": "git" }, { "version": "67a95c21463d066060b0f66d65a75d45bb386ffb", "lessThan": "62ac2473553a00229e67bdf3cb023b62cf7f5a9a", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/hid/hid-mcp2221.c" ], "versions": [ { "version": "5.7", "status": "affected" }, { "version": "0", "lessThan": "5.7", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.137", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.61", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.18.18", "lessThanOrEqual": "5.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.19.2", "lessThanOrEqual": "5.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.0", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "5.10.137" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "5.15.61" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "5.18.18" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "5.19.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.0" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/66c8e816f2f2ca4a61b406503bd10bad1b35f72f" }, { "url": "https://git.kernel.org/stable/c/91443c669d280937968f0aa4edefa741cfe35314" }, { "url": "https://git.kernel.org/stable/c/6402116a7b5ec80fa40fd145a80c813019cd555f" }, { "url": "https://git.kernel.org/stable/c/3c0f8a59f2cc8841ee6653399a77f4f3e6e9a270" }, { "url": "https://git.kernel.org/stable/c/62ac2473553a00229e67bdf3cb023b62cf7f5a9a" } ], "title": "HID: mcp2221: prevent a buffer overflow in mcp_smbus_write()", "x_generator": { "engine": "bippy-1.2.0" } } } }