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{"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxhci: Fix command ring pointer corruption while aborting a command\n\nThe command ring pointer is located at [6:63] bits of the command\nring control register (CRCR). All the control bits like command stop,\nabort are located at [0:3] bits. While aborting a command, we read the\nCRCR and set the abort bit and write to the CRCR. The read will always\ngive command ring pointer as all zeros. So we essentially write only\nthe control bits. Since we split the 64 bit write into two 32 bit writes,\nthere is a possibility of xHC command ring stopped before the upper\ndword (all zeros) is written. If that happens, xHC updates the upper\ndword of its internal command ring pointer with all zeros. Next time,\nwhen the command ring is restarted, we see xHC memory access failures.\nFix this issue by only writing to the lower dword of CRCR where all\ncontrol bits are located."}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: xhci: corrige la corrupci\u00f3n del puntero del anillo de comando al cancelar un comando. El puntero del anillo de comando est\u00e1 ubicado en los bits [6:63] del registro de control del anillo de comando (CRCR). Todos los bits de control, como el comando de parada y cancelaci\u00f3n, se encuentran en bits [0:3]. Mientras abortamos un comando, leemos el CRCR, configuramos el bit de cancelaci\u00f3n y escribimos en el CRCR. La lectura siempre dar\u00e1 un puntero de anillo de comando como todo ceros. B\u00e1sicamente, escribimos s\u00f3lo los bits de control. Dado que dividimos la escritura de 64 bits en dos escrituras de 32 bits, existe la posibilidad de que el anillo de comando xHC se detenga antes de que se escriba la palabra d superior (todo ceros). Si eso sucede, xHC actualiza la palabra clave superior de su puntero de anillo de comando interno con todo ceros. La pr\u00f3xima vez, cuando se reinicie el anillo de comando, veremos fallas de acceso a la memoria xHC. Solucione este problema escribiendo \u00fanicamente en la palabra clave inferior de CRCR donde se encuentran todos los bits de control."}], "id": "CVE-2021-47434", "lastModified": "2024-05-22T12:46:53.887", "metrics": {}, "published": "2024-05-22T07:15:08.707", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/01c2dcb67e71c351006dd17cbba86c26b7f61eaf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/22bcb65ea41072ab5d03c0c6290e04e0df6d09a0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/62c182b5e763e5f4062e72678e72ce3e02dd4d1b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/dec944bb7079b37968cf69c8a438f91f15c4cc61"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e54abefe703ab7c4e5983e889babd1447738ca42"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ff0e50d3564f33b7f4b35cadeabd951d66cfc570"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{"bugzilla": {"description": "kernel: xhci: Fix command ring pointer corruption while aborting a command", "id": "2282880", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282880"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.1", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H", "status": "draft"}, "cwe": "CWE-822", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nxhci: Fix command ring pointer corruption while aborting a command\nThe command ring pointer is located at [6:63] bits of the command\nring control register (CRCR). All the control bits like command stop,\nabort are located at [0:3] bits. While aborting a command, we read the\nCRCR and set the abort bit and write to the CRCR. The read will always\ngive command ring pointer as all zeros. So we essentially write only\nthe control bits. Since we split the 64 bit write into two 32 bit writes,\nthere is a possibility of xHC command ring stopped before the upper\ndword (all zeros) is written. If that happens, xHC updates the upper\ndword of its internal command ring pointer with all zeros. Next time,\nwhen the command ring is restarted, we see xHC memory access failures.\nFix this issue by only writing to the lower dword of CRCR where all\ncontrol bits are located."], "name": "CVE-2021-47434", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47434\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47434"], "threat_severity": "Low", "upstream_fix": "kernel 4.14.252, kernel 4.19.213, kernel 5.4.155, kernel 5.10.75, kernel 5.14.14, kernel 5.15"}