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

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，已解决以下漏洞： usb: gadget: f_tcm：修复 usbg_make_tpg() 中的死锁问题 usbg_make_tpg() 在调用 configfs_depend_item_unlocked() 时持有 dep_lock，而该函数在跨子系统操作时会获取 configfs 根 inode 锁。这导致与 configfs_rmdir() 之间形成循环锁依赖关系： dep_lock -> configfs 根 inode 锁 -> su_mutex -> dep_lock 在 us

AI Predicted 5.5 Difficulty: Theoretical EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1690 · Prevent Command History Logging

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 4bb8548df632187d5db50878e71804af5f7c51ad< abad5daa41cf5d0a0a9cba0397d3a0e7f11e0277 affected
4bb8548df632187d5db50878e71804af5f7c51ad< 3639438a4c83ffc2e564c8c010b92137c5d11cfa affected
4bb8548df632187d5db50878e71804af5f7c51ad< 78a14ea2284825055ab6c2a1f3489510f560f3a2 affected
4bb8548df632187d5db50878e71804af5f7c51ad< eef3e62f90d86c1c5651742f84ecc9db1814a893 affected
4bb8548df632187d5db50878e71804af5f7c51ad< f81a2da137b029a282b9bc64d2f267d242948659 affected
4bb8548df632187d5db50878e71804af5f7c51ad< 6bcd9ee6ad6989d1d85a7459687e45b7ad7568d9 affected
4bb8548df632187d5db50878e71804af5f7c51ad< d90b0f90e30cd59b36005a4016b15cf02bcd7fb2 affected
4bb8548df632187d5db50878e71804af5f7c51ad< 9dbf74f4022f80f7669d2b3c22c5deb46c1b5674 affected
… +10 more rows
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I. Basic Information for CVE-2026-93214

Vulnerability Information
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Vulnerability Title
usb: gadget: f_tcm: fix deadlock in usbg_make_tpg()
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 4bb8548df632187d5db50878e71804af5f7c51ad ~ abad5daa41cf5d0a0a9cba0397d3a0e7f11e0277 -
Linux Linux 4.5 -

II. Public POCs for CVE-2026-93214

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III. Intelligence Information for CVE-2026-93214

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Patches & Fixes for CVE-2026-93214 (8)

Same Patch Batch · Linux · 2026-09-24 · 234 CVEs total

CVE-2026-93207 9.8 CRITICAL SUNRPC: Zero rpc_gss_wire_cred at svcauth_gss_decode_credbody() entry
CVE-2026-97413 9.8 CRITICAL RDMA/rtrs-srv: Fix integer underflow in process_read and process_write
CVE-2026-93228 9.1 CRITICAL svcrdma: Reject Write/Reply chunks with segcount 0
CVE-2026-93793 8.8 HIGH wifi: iwlwifi: mvm: validate TX_CMD response layout
CVE-2026-93799 8.8 HIGH wifi: iwlwifi: mvm: validate sta_id in BA window status notif
CVE-2026-93790 8.8 HIGH wifi: iwlwifi: mvm: fix out-of-bounds tid_data access in BA notif
CVE-2026-93806 8.8 HIGH wifi: cfg80211: validate assoc response length before status and IE access
CVE-2026-97442 8.8 HIGH wifi: ath11k: fix invalid data access in ath11k_dp_rx_h_undecap_nwifi
CVE-2026-97409 8.8 HIGH nvme-fc: Do not cancel requests in io target before it is initialized
CVE-2026-97509 8.8 HIGH thunderbolt: Keep XDomain reference during the lifetime of a service
CVE-2026-93280 8.8 HIGH greybus: audio: bound the topology section sizes against the fetched size
CVE-2026-93284 8.8 HIGH drm/pagemap: dma-unmap pages before handling migration errors
CVE-2026-97451 8.4 HIGH ACPICA: Fix integer overflow in acpi_ex_opcode_3A_1T_1R() (mid_op)
CVE-2026-97452 8.4 HIGH ACPICA: Prevent adding invalid references
CVE-2026-97455 8.4 HIGH ACPICA: Fix use-after-free in acpi_ds_terminate_control_method()
CVE-2026-97450 8.4 HIGH ACPICA: validate handler object type in two places
CVE-2026-93827 8.4 HIGH virtio-fs: avoid double-free on failed queue setup
CVE-2026-97433 8.2 HIGH nvme: validate FDP configuration descriptor sizes
CVE-2026-93787 8.1 HIGH smb: client: bound dirent name against end of SMB response in cifs_filldir
CVE-2026-93224 8.1 HIGH svcrdma: Fix unmatched rn_unregister on failed accept

Showing top 20 of 234 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-93214

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