What’s Vulnerable › Vulnerabilities

CVE-2026-93214: usb: gadget: f_tcm: fix deadlock in usbg_make_tpg()

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-24 · updated 2026-10-19

Description

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 products

• Linux kernel: 4.5 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/3639438a4c83ffc2e564c8c010b92137c5d11cfa
• https://git.kernel.org/stable/c/6bcd9ee6ad6989d1d85a7459687e45b7ad7568d9
• https://git.kernel.org/stable/c/78a14ea2284825055ab6c2a1f3489510f560f3a2
• https://git.kernel.org/stable/c/9dbf74f4022f80f7669d2b3c22c5deb46c1b5674
• https://git.kernel.org/stable/c/abad5daa41cf5d0a0a9cba0397d3a0e7f11e0277
• https://git.kernel.org/stable/c/d90b0f90e30cd59b36005a4016b15cf02bcd7fb2
• https://git.kernel.org/stable/c/eef3e62f90d86c1c5651742f84ecc9db1814a893
• https://git.kernel.org/stable/c/f81a2da137b029a282b9bc64d2f267d242948659

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