{"id":"AZL-65690","summary":"CVE-2025-38448 affecting package kernel for versions less than 6.6.104.2-1","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: u_serial: Fix race condition in TTY wakeup\n\nA race condition occurs when gs_start_io() calls either gs_start_rx() or\ngs_start_tx(), as those functions briefly drop the port_lock for\nusb_ep_queue(). This allows gs_close() and gserial_disconnect() to clear\nport.tty and port_usb, respectively.\n\nUse the null-safe TTY Port helper function to wake up TTY.\n\nExample\n  CPU1:\t\t\t      CPU2:\n  gserial_connect() // lock\n  \t\t\t      gs_close() // await lock\n  gs_start_rx()     // unlock\n  usb_ep_queue()\n  \t\t\t      gs_close() // lock, reset port.tty and unlock\n  gs_start_rx()     // lock\n  tty_wakeup()      // NPE","modified":"2026-04-01T05:20:37.383468Z","published":"2025-07-25T16:15:30Z","upstream":["CVE-2025-38448"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-38448"}],"affected":[{"package":{"name":"kernel","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/kernel"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.6.104.2-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-65690.json"}}],"schema_version":"1.7.5"}