CVE-2025-38448

Summary

In the Linux kernel, the following vulnerability has been resolved:

usb: gadget: u_serial: Fix race condition in TTY wakeup

A race condition occurs when gs_start_io() calls either gs_start_rx() or gs_start_tx(), as those functions briefly drop the port_lock for usb_ep_queue(). This allows gs_close() and gserial_disconnect() to clear port.tty and port_usb, respectively.

Use the null-safe TTY Port helper function to wake up TTY.

Example CPU1: CPU2: gserial_connect() // lock gs_close() // await lock gs_start_rx() // unlock usb_ep_queue() gs_close() // lock, reset port.tty and unlock gs_start_rx() // lock tty_wakeup() // NPE

Affected Software

VendorProductVersion RangeStatus
LinuxLinux35f95fd7f234d2b58803bab6f6ebd6bb988050a2 < 18d58a467ccf011078352d91b4d6a0108c7318e8affected
LinuxLinux35f95fd7f234d2b58803bab6f6ebd6bb988050a2 < d43657b59f36e88289a6066f15bc9a80df5014ebaffected
LinuxLinux35f95fd7f234d2b58803bab6f6ebd6bb988050a2 < a5012673d49788f16bb4e375b002d7743eb642d9affected
LinuxLinux35f95fd7f234d2b58803bab6f6ebd6bb988050a2 < ee8d688e2ba558f3bb8ac225113740be5f335417affected
LinuxLinux35f95fd7f234d2b58803bab6f6ebd6bb988050a2 < c6eb4a05af3d0ba3bc4e8159287722fb9abc6359affected
LinuxLinux35f95fd7f234d2b58803bab6f6ebd6bb988050a2 < abf3620cba68e0e51e5c21054ce4f925f75b3661affected
LinuxLinux35f95fd7f234d2b58803bab6f6ebd6bb988050a2 < c8c80a3a35c2e3488409de2d5376ef7e662a2bf5affected
LinuxLinux35f95fd7f234d2b58803bab6f6ebd6bb988050a2 < c529c3730bd09115684644e26bf01ecbd7e2c2c9affected
LinuxLinux3.5affected
LinuxLinux0 < 3.5unaffected
LinuxLinux5.4.296 <= 5.4.*unaffected
LinuxLinux5.10.240 <= 5.10.*unaffected
LinuxLinux5.15.189 <= 5.15.*unaffected
LinuxLinux6.1.146 <= 6.1.*unaffected
LinuxLinux6.6.99 <= 6.6.*unaffected
LinuxLinux6.12.39 <= 6.12.*unaffected
LinuxLinux6.15.7 <= 6.15.*unaffected
LinuxLinux6.16 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

References