{"id":"CVE-2025-21689","summary":"USB: serial: quatech2: fix null-ptr-deref in qt2_process_read_urb()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: serial: quatech2: fix null-ptr-deref in qt2_process_read_urb()\n\nThis patch addresses a null-ptr-deref in qt2_process_read_urb() due to\nan incorrect bounds check in the following:\n\n       if (newport \u003e serial-\u003enum_ports) {\n               dev_err(&port-\u003edev,\n                       \"%s - port change to invalid port: %i\\n\",\n                       __func__, newport);\n               break;\n       }\n\nThe condition doesn't account for the valid range of the serial-\u003eport\nbuffer, which is from 0 to serial-\u003enum_ports - 1. When newport is equal\nto serial-\u003enum_ports, the assignment of \"port\" in the\nfollowing code is out-of-bounds and NULL:\n\n       serial_priv-\u003ecurrent_port = newport;\n       port = serial-\u003eport[serial_priv-\u003ecurrent_port];\n\nThe fix checks if newport is greater than or equal to serial-\u003enum_ports\nindicating it is out-of-bounds.","modified":"2026-04-16T04:38:20.042635305Z","published":"2025-02-10T15:58:45.493Z","related":["SUSE-SU-2025:0784-1","SUSE-SU-2025:0834-1","SUSE-SU-2025:0847-1","SUSE-SU-2025:0856-1","SUSE-SU-2025:0955-1","SUSE-SU-2025:20190-1","SUSE-SU-2025:20192-1","SUSE-SU-2025:20260-1","SUSE-SU-2025:20270-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21689.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/4b9b41fabcd38990f69ef0cee9c631d954a2b530"},{"type":"WEB","url":"https://git.kernel.org/stable/c/575a5adf48b06a2980c9eeffedf699ed5534fade"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6068dcff7f19e9fa6fa23ee03453ad6a40fa4efe"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6377838560c03b36e1153a42ef727533def9b68f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8542b33622571f54dfc2a267fce378b6e3840b8b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/94770cf7c5124f0268d481886829dc2beecc4507"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f371471708c7d997f763b0e70565026eb67cc470"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fa4c7472469d97c4707698b4c0e098f8cfc2bf22"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21689.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-21689"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"f7a33e608d9ae022b7f49307921627e34e9484ed"},{"fixed":"fa4c7472469d97c4707698b4c0e098f8cfc2bf22"},{"fixed":"94770cf7c5124f0268d481886829dc2beecc4507"},{"fixed":"6068dcff7f19e9fa6fa23ee03453ad6a40fa4efe"},{"fixed":"4b9b41fabcd38990f69ef0cee9c631d954a2b530"},{"fixed":"6377838560c03b36e1153a42ef727533def9b68f"},{"fixed":"f371471708c7d997f763b0e70565026eb67cc470"},{"fixed":"8542b33622571f54dfc2a267fce378b6e3840b8b"},{"fixed":"575a5adf48b06a2980c9eeffedf699ed5534fade"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-21689.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}