{"id":"DEBIAN-CVE-2025-22003","details":"In the Linux kernel, the following vulnerability has been resolved:  can: ucan: fix out of bound read in strscpy() source  Commit 7fdaf8966aae (\"can: ucan: use strscpy() to instead of strncpy()\") unintentionally introduced a one byte out of bound read on strscpy()'s source argument (which is kind of ironic knowing that strscpy() is meant to be a more secure alternative :)).  Let's consider below buffers:    dest[len + 1]; /* will be NUL terminated */   src[len]; /* may not be NUL terminated */  When doing:    strncpy(dest, src, len);   dest[len] = '\\0';  strncpy() will read up to len bytes from src.  On the other hand:    strscpy(dest, src, len + 1);  will read up to len + 1 bytes from src, that is to say, an out of bound read of one byte will occur on src if it is not NUL terminated. Note that the src[len] byte is never copied, but strscpy() still needs to read it to check whether a truncation occurred or not.  This exact pattern happened in ucan.  The root cause is that the source is not NUL terminated. Instead of doing a copy in a local buffer, directly NUL terminate it as soon as usb_control_msg() returns. With this, the local firmware_str[] variable can be removed.  On top of this do a couple refactors:    - ucan_ctl_payload-\u003eraw is only used for the firmware string, so     rename it to ucan_ctl_payload-\u003efw_str and change its type from u8 to     char.    - ucan_device_request_in() is only used to retrieve the firmware     string, so rename it to ucan_get_fw_str() and refactor it to make it     directly handle all the string termination logic.","modified":"2026-08-27T23:05:12.587279399Z","published":"2025-04-03T08:15:15.840Z","upstream":["CVE-2025-22003"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2025-22003"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.12.21-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2025-22003.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.12.21-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2025-22003.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}