CVE-2025-38268— usb: typec: tcpm: move tcpm_queue_vdm_unlocked to asynchronous work
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.
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于typec-tcpm中的状态检查问题，可能导致死锁。
Possible ATT&CK Techniques 1 AI
T1499 · Endpoint Denial of ServiceAffected Version Matrix 8
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | cdc9946ea6377e8e214b135ccc308c5e514ba25f< 7bdd712abefbec79176ab412d8c623e755c5d0ba |
affected |
cdc9946ea6377e8e214b135ccc308c5e514ba25f< 1970d34b48cbeceb0c765984c9a6bb204c77f16a |
affected | ||
cdc9946ea6377e8e214b135ccc308c5e514ba25f< 324d45e53f1a36c88bc649dc39e0c8300a41be0a |
affected | ||
6.9 |
affected | ||
< 6.9 |
unaffected | ||
6.12.34≤ 6.12.* |
unaffected | ||
6.15.3≤ 6.15.* |
unaffected | ||
6.16≤ * |
unaffected |
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I. Basic Information for CVE-2025-38268
Vulnerability Information
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Vulnerability Title
usb: typec: tcpm: move tcpm_queue_vdm_unlocked to asynchronous work
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
usb: typec: tcpm: move tcpm_queue_vdm_unlocked to asynchronous work
A state check was previously added to tcpm_queue_vdm_unlocked to
prevent a deadlock where the DisplayPort Alt Mode driver would be
executing work and attempting to grab the tcpm_lock while the TCPM
was holding the lock and attempting to unregister the altmode, blocking
on the altmode driver's cancel_work_sync call.
Because the state check isn't protected, there is a small window
where the Alt Mode driver could determine that the TCPM is
in a ready state and attempt to grab the lock while the
TCPM grabs the lock and changes the TCPM state to one that
causes the deadlock. The callstack is provided below:
[110121.667392][ C7] Call trace:
[110121.667396][ C7] __switch_to+0x174/0x338
[110121.667406][ C7] __schedule+0x608/0x9f0
[110121.667414][ C7] schedule+0x7c/0xe8
[110121.667423][ C7] kernfs_drain+0xb0/0x114
[110121.667431][ C7] __kernfs_remove+0x16c/0x20c
[110121.667436][ C7] kernfs_remove_by_name_ns+0x74/0xe8
[110121.667442][ C7] sysfs_remove_group+0x84/0xe8
[110121.667450][ C7] sysfs_remove_groups+0x34/0x58
[110121.667458][ C7] device_remove_groups+0x10/0x20
[110121.667464][ C7] device_release_driver_internal+0x164/0x2e4
[110121.667475][ C7] device_release_driver+0x18/0x28
[110121.667484][ C7] bus_remove_device+0xec/0x118
[110121.667491][ C7] device_del+0x1e8/0x4ac
[110121.667498][ C7] device_unregister+0x18/0x38
[110121.667504][ C7] typec_unregister_altmode+0x30/0x44
[110121.667515][ C7] tcpm_reset_port+0xac/0x370
[110121.667523][ C7] tcpm_snk_detach+0x84/0xb8
[110121.667529][ C7] run_state_machine+0x4c0/0x1b68
[110121.667536][ C7] tcpm_state_machine_work+0x94/0xe4
[110121.667544][ C7] kthread_worker_fn+0x10c/0x244
[110121.667552][ C7] kthread+0x104/0x1d4
[110121.667557][ C7] ret_from_fork+0x10/0x20
[110121.667689][ C7] Workqueue: events dp_altmode_work
[110121.667697][ C7] Call trace:
[110121.667701][ C7] __switch_to+0x174/0x338
[110121.667710][ C7] __schedule+0x608/0x9f0
[110121.667717][ C7] schedule+0x7c/0xe8
[110121.667725][ C7] schedule_preempt_disabled+0x24/0x40
[110121.667733][ C7] __mutex_lock+0x408/0xdac
[110121.667741][ C7] __mutex_lock_slowpath+0x14/0x24
[110121.667748][ C7] mutex_lock+0x40/0xec
[110121.667757][ C7] tcpm_altmode_enter+0x78/0xb4
[110121.667764][ C7] typec_altmode_enter+0xdc/0x10c
[110121.667769][ C7] dp_altmode_work+0x68/0x164
[110121.667775][ C7] process_one_work+0x1e4/0x43c
[110121.667783][ C7] worker_thread+0x25c/0x430
[110121.667789][ C7] kthread+0x104/0x1d4
[110121.667794][ C7] ret_from_fork+0x10/0x20
Change tcpm_queue_vdm_unlocked to queue for tcpm_queue_vdm_work,
which can perform the state check while holding the TCPM lock
while the Alt Mode lock is no longer held. This requires a new
struct to hold the vdm data, altmode_vdm_event.
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
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于typec-tcpm中的状态检查问题，可能导致死锁。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2025-38268
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Linux · 2025-07-10 · 84 CVEs total
| CVE-2025-38325 | 9.8 CRITICAL | ksmbd: add free_transport ops in ksmbd connection |
| CVE-2025-38290 | 8.8 HIGH | wifi: ath12k: fix node corruption in ar->arvifs list |
| CVE-2025-38291 | 8.8 HIGH | wifi: ath12k: Prevent sending WMI commands to firmware during firmware crash |
| CVE-2025-38283 | 8.8 HIGH | hisi_acc_vfio_pci: bugfix live migration function without VF device driver |
| CVE-2025-38293 | 8.8 HIGH | wifi: ath11k: fix node corruption in ar->arvifs list |
| CVE-2025-38292 | 8.8 HIGH | wifi: ath12k: fix invalid access to memory |
| CVE-2025-38343 | 8.3 HIGH | wifi: mt76: mt7996: drop fragments with multicast or broadcast RA |
| CVE-2025-38333 | 7.8 HIGH | f2fs: fix to bail out in get_new_segment() |
| CVE-2025-38303 | 7.8 HIGH | Bluetooth: eir: Fix possible crashes on eir_create_adv_data |
| CVE-2025-38341 | 7.8 HIGH | eth: fbnic: avoid double free when failing to DMA-map FW msg |
| CVE-2025-38276 | 7.8 HIGH | fs/dax: Fix "don't skip locked entries when scanning entries" |
| CVE-2025-38346 | 7.8 HIGH | ftrace: Fix UAF when lookup kallsym after ftrace disabled |
| CVE-2025-38321 | 7.8 HIGH | smb: Log an error when close_all_cached_dirs fails |
| CVE-2025-38270 | 7.8 HIGH | net: drv: netdevsim: don't napi_complete() from netpoll |
| CVE-2025-38306 | 7.8 HIGH | fs/fhandle.c: fix a race in call of has_locked_children() |
| CVE-2025-38273 | 7.8 HIGH | net: tipc: fix refcount warning in tipc_aead_encrypt |
| CVE-2025-38278 | 7.8 HIGH | octeontx2-pf: QOS: Refactor TC_HTB_LEAF_DEL_LAST callback |
| CVE-2025-38339 | 7.8 HIGH | powerpc/bpf: fix JIT code size calculation of bpf trampoline |
| CVE-2025-38317 | 7.8 HIGH | wifi: ath12k: Fix buffer overflow in debugfs |
| CVE-2025-38287 | 7.5 HIGH | IB/cm: Drop lockdep assert and WARN when freeing old msg |
Showing top 20 of 84 CVEs. View all on vendor page → →
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V. Comments for CVE-2025-38268
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