{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-50156", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-06-18T10:57:27.425Z", "datePublished": "2025-06-18T11:03:13.913Z", "dateUpdated": "2026-08-05T08:57:33.812Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:57:33.812Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: cp2112: prevent a buffer overflow in cp2112_xfer()\n\nSmatch warnings:\ndrivers/hid/hid-cp2112.c:793 cp2112_xfer() error: __memcpy()\n'data->block[1]' too small (33 vs 255)\ndrivers/hid/hid-cp2112.c:793 cp2112_xfer() error: __memcpy() 'buf' too\nsmall (64 vs 255)\n\nThe 'read_length' variable is provided by 'data->block[0]' which comes\nfrom user and it(read_length) can take a value between 0-255. Add an\nupper bound to 'read_length' variable to prevent a buffer overflow in\nmemcpy()." } ], "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 triggered through the local i2c-dev I2C_SMBUS ioctl path into cp2112_xfer(), not by crafted USB HID reports from a malicious peripheral. Presence of a CP2112 adapter is a deployment precondition; the attack itself is a local syscall against /dev/i2c-N.\nAC:L - An attacker who can open the adapter reliably sets data->block[0] above I2C_SMBUS_BLOCK_MAX (e.g. 33–61) and completes a normal I2C block read; no race or unpredictable state outside attacker influence is required. CP2112 deployments typically have responding I2C slaves (EEPROMs/sensors) that the attacker can address.\nPR:L - i2cdev_open() performs no capability check; access is governed by /dev/i2c-* permissions, commonly 0660 root:i2c or similarly granted to unprivileged service accounts on embedded/industrial systems. That is basic local access, not real root/init-namespace admin rights.\nUI:N - Exploitation requires only the attacker issuing ioctl(I2C_SMBUS) with I2C_SMBUS_I2C_BLOCK_DATA; no victim action is needed.\nS:U - This is ordinary kernel memory corruption within the host OS authority (local privilege escalation/DoS), with no VM escape, IOMMU bypass, or other cross-boundary impact.\nC:H - The bug is an out-of-bounds write of attacker-chosen length (and I2C-sourced contents) past union i2c_smbus_data on the stack, which is memory corruption that can be leveraged for information disclosure.\nI:H - Out-of-bounds stack write via memcpy(data->block+1, buf, read_length) with read_length up to 61 into a 33-byte destination enables integrity compromise and potential control-flow hijacking.\nA:H - The same memory corruption can crash the kernel (oops/panic) 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-cp2112.c" ], "versions": [ { "version": "542134c0375b5ca2b1d18490c02b8a20bfdd8d74", "lessThan": "3af7d60e9a6c17d6d41c4341f8020511887d372d", "status": "affected", "versionType": "git" }, { "version": "542134c0375b5ca2b1d18490c02b8a20bfdd8d74", "lessThan": "519ff31a6ddd87aa4905bd9bf3b92e8b88801614", "status": "affected", "versionType": "git" }, { "version": "542134c0375b5ca2b1d18490c02b8a20bfdd8d74", "lessThan": "ebda3d6b004bb6127a66a616524a2de152302ca7", "status": "affected", "versionType": "git" }, { "version": "542134c0375b5ca2b1d18490c02b8a20bfdd8d74", "lessThan": "8489a20ac481b08c0391608d81ed3796d373cfdf", "status": "affected", "versionType": "git" }, { "version": "542134c0375b5ca2b1d18490c02b8a20bfdd8d74", "lessThan": "e7028944e61014ae915e7fb74963d3835f2f761a", "status": "affected", "versionType": "git" }, { "version": "542134c0375b5ca2b1d18490c02b8a20bfdd8d74", "lessThan": "26e427ac85c2b8d0d108cc80b6de34d33e2780c4", "status": "affected", "versionType": "git" }, { "version": "542134c0375b5ca2b1d18490c02b8a20bfdd8d74", "lessThan": "381583845d19cb4bd21c8193449385f3fefa9caf", "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-cp2112.c" ], "versions": [ { "version": "4.15", "status": "affected" }, { "version": "0", "lessThan": "4.15", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.256", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.211", "lessThanOrEqual": "5.4.*", "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": "4.15", "versionEndExcluding": "4.19.256" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "5.4.211" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "5.10.137" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "5.15.61" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "5.18.18" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "5.19.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.0" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/3af7d60e9a6c17d6d41c4341f8020511887d372d" }, { "url": "https://git.kernel.org/stable/c/519ff31a6ddd87aa4905bd9bf3b92e8b88801614" }, { "url": "https://git.kernel.org/stable/c/ebda3d6b004bb6127a66a616524a2de152302ca7" }, { "url": "https://git.kernel.org/stable/c/8489a20ac481b08c0391608d81ed3796d373cfdf" }, { "url": "https://git.kernel.org/stable/c/e7028944e61014ae915e7fb74963d3835f2f761a" }, { "url": "https://git.kernel.org/stable/c/26e427ac85c2b8d0d108cc80b6de34d33e2780c4" }, { "url": "https://git.kernel.org/stable/c/381583845d19cb4bd21c8193449385f3fefa9caf" } ], "title": "HID: cp2112: prevent a buffer overflow in cp2112_xfer()", "x_generator": { "engine": "bippy-1.2.0" } } } }