CVE-2022-50156

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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\u201361) 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", 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"https://git.kernel.org/stable/c/381583845d19cb4bd21c8193449385f3fefa9caf"}], "title": "HID: cp2112: prevent a buffer overflow in cp2112_xfer()", "x_generator": {"engine": "bippy-1.2.0"}}}}

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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()."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: HID: cp2112: evitar un desbordamiento de b\u00fafer en cp2112_xfer() Advertencias de Smatch: drivers/hid/hid-cp2112.c:793 Error de cp2112_xfer(): __memcpy() 'data->block[1]' demasiado peque\u00f1o (33 frente a 255) drivers/hid/hid-cp2112.c:793 Error de cp2112_xfer(): __memcpy() 'buf' demasiado peque\u00f1o (64 frente a 255) La variable 'read_length' la proporciona 'data->block[0]', que proviene del usuario, y puede tomar un valor entre 0 y 255. A\u00f1ada un l\u00edmite superior a la variable 'read_length' para evitar un desbordamiento de b\u00fafer en memcpy()."}], "id": "CVE-2022-50156", "lastModified": "2026-08-04T10:18:06.150", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-06-18T11:15:45.747", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/26e427ac85c2b8d0d108cc80b6de34d33e2780c4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/381583845d19cb4bd21c8193449385f3fefa9caf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3af7d60e9a6c17d6d41c4341f8020511887d372d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/519ff31a6ddd87aa4905bd9bf3b92e8b88801614"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8489a20ac481b08c0391608d81ed3796d373cfdf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e7028944e61014ae915e7fb74963d3835f2f761a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ebda3d6b004bb6127a66a616524a2de152302ca7"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: HID: cp2112: prevent a buffer overflow in cp2112_xfer()", "id": "2373461", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2373461"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nHID: cp2112: prevent a buffer overflow in cp2112_xfer()\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)\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()."], "name": "CVE-2022-50156", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-06-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-50156\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-50156\nhttps://lore.kernel.org/linux-cve-announce/2025061824-CVE-2022-50156-3e2e@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-06-23T08:45:29.666046+00:00", "updated": "2025-06-23T08:45:29.666096+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}