{"id":"AZL-59826","summary":"CVE-2025-22003 affecting package kernel for versions less than 6.6.85.1-2","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ncan: ucan: fix out of bound read in strscpy() source\n\nCommit 7fdaf8966aae (\"can: ucan: use strscpy() to instead of strncpy()\")\nunintentionally introduced a one byte out of bound read on strscpy()'s\nsource argument (which is kind of ironic knowing that strscpy() is meant\nto be a more secure alternative :)).\n\nLet's consider below buffers:\n\n  dest[len + 1]; /* will be NUL terminated */\n  src[len]; /* may not be NUL terminated */\n\nWhen doing:\n\n  strncpy(dest, src, len);\n  dest[len] = '\\0';\n\nstrncpy() will read up to len bytes from src.\n\nOn the other hand:\n\n  strscpy(dest, src, len + 1);\n\nwill read up to len + 1 bytes from src, that is to say, an out of bound\nread of one byte will occur on src if it is not NUL terminated. Note\nthat the src[len] byte is never copied, but strscpy() still needs to\nread it to check whether a truncation occurred or not.\n\nThis exact pattern happened in ucan.\n\nThe root cause is that the source is not NUL terminated. Instead of\ndoing a copy in a local buffer, directly NUL terminate it as soon as\nusb_control_msg() returns. With this, the local firmware_str[] variable\ncan be removed.\n\nOn top of this do a couple refactors:\n\n  - ucan_ctl_payload-\u003eraw is only used for the firmware string, so\n    rename it to ucan_ctl_payload-\u003efw_str and change its type from u8 to\n    char.\n\n  - ucan_device_request_in() is only used to retrieve the firmware\n    string, so rename it to ucan_get_fw_str() and refactor it to make it\n    directly handle all the string termination logic.","modified":"2026-04-01T05:19:33.051330Z","published":"2025-04-03T08:15:15Z","upstream":["CVE-2025-22003"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-22003"}],"affected":[{"package":{"name":"kernel","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/kernel"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.6.85.1-2"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-59826.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"}]}