CVE-2026-93214

Summary

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

usb: gadget: f_tcm: fix deadlock in usbg_make_tpg()

usbg_make_tpg() held dep_lock while calling configfs_depend_item_unlocked(), which acquires the configfs root inode lock when operating across subsystems. This creates a circular lock dependency with configfs_rmdir():

dep_lock -> configfs root inode lock -> su_mutex -> dep_lock

In usbg_make_tpg(), dep_lock only serialized the read of opts->ready, which is a monotonic flag that transitions from false to true exactly once (in tcm_set_name()) and never reverts. Remove dep_lock from usbg_make_tpg() entirely and use READ_ONCE/WRITE_ONCE to access opts->ready locklessly instead.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux4bb8548df632187d5db50878e71804af5f7c51ad < abad5daa41cf5d0a0a9cba0397d3a0e7f11e0277affected
LinuxLinux4bb8548df632187d5db50878e71804af5f7c51ad < 3639438a4c83ffc2e564c8c010b92137c5d11cfaaffected
LinuxLinux4bb8548df632187d5db50878e71804af5f7c51ad < 78a14ea2284825055ab6c2a1f3489510f560f3a2affected
LinuxLinux4bb8548df632187d5db50878e71804af5f7c51ad < eef3e62f90d86c1c5651742f84ecc9db1814a893affected
LinuxLinux4bb8548df632187d5db50878e71804af5f7c51ad < f81a2da137b029a282b9bc64d2f267d242948659affected
LinuxLinux4bb8548df632187d5db50878e71804af5f7c51ad < 6bcd9ee6ad6989d1d85a7459687e45b7ad7568d9affected
LinuxLinux4bb8548df632187d5db50878e71804af5f7c51ad < d90b0f90e30cd59b36005a4016b15cf02bcd7fb2affected
LinuxLinux4bb8548df632187d5db50878e71804af5f7c51ad < 9dbf74f4022f80f7669d2b3c22c5deb46c1b5674affected
LinuxLinux4.5affected
LinuxLinux0 < 4.5unaffected
LinuxLinux5.10.270 <= 5.10.*unaffected
LinuxLinux5.15.221 <= 5.15.*unaffected
LinuxLinux6.1.188 <= 6.1.*unaffected
LinuxLinux6.6.157 <= 6.6.*unaffected
LinuxLinux6.12.109 <= 6.12.*unaffected
LinuxLinux6.18.50 <= 6.18.*unaffected
LinuxLinux7.2.4 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References