{"id":"CVE-2025-38268","title":"usb: typec: tcpm: move tcpm_queue_vdm_unlocked to asynchronous work","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: typec: tcpm: move tcpm_queue_vdm_unlocked to asynchronous work\n\nA state check was previously added to tcpm_queue_vdm_unlocked to\nprevent a deadlock where the Displ…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= cdc9946ea6377e8e214b135ccc308c5e514ba25f < 7bdd712abefbec79176ab412d8c623e755c5d0ba","Linux >= cdc9946ea6377e8e214b135ccc308c5e514ba25f < 1970d34b48cbeceb0c765984c9a6bb204c77f16a","Linux >= cdc9946ea6377e8e214b135ccc308c5e514ba25f < 324d45e53f1a36c88bc649dc39e0c8300a41be0a","Linux 6.9"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-05T20:52:43.986516Z"},"published":"2025-07-10","updated":"2026-11-05","sourceUpdated":"2026-11-05T21:02:29.814Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-38268","references":[{"url":"https://git.kernel.org/stable/c/7bdd712abefbec79176ab412d8c623e755c5d0ba"},{"url":"https://git.kernel.org/stable/c/1970d34b48cbeceb0c765984c9a6bb204c77f16a"},{"url":"https://git.kernel.org/stable/c/324d45e53f1a36c88bc649dc39e0c8300a41be0a"}],"tags":["cve.org"],"epss":0.00141,"epssPercentile":0.03487,"ingestedAt":"2026-11-05T22:38:31.945Z","slug":"CVE-2025-38268","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nusb: typec: tcpm: move tcpm_queue_vdm_unlocked to asynchronous work\n\nA state check was previously added to tcpm_queue_vdm_unlocked to\nprevent a deadlock where the DisplayPort Alt Mode driver would be\nexecuting work and attempting to grab the tcpm_lock while the TCPM\nwas holding the lock and attempting to unregister the altmode, blocking\non the altmode driver's cancel_work_sync call.\n\nBecause the state check isn't protected, there is a small window\nwhere the Alt Mode driver could determine that the TCPM is\nin a ready state and attempt to grab the lock while the\nTCPM grabs the lock and changes the TCPM state to one that\ncauses the deadlock. The callstack is provided below:\n\n[110121.667392][    C7] Call trace:\n[110121.667396][    C7]  __switch_to+0x174/0x338\n[110121.667406][    C7]  __schedule+0x608/0x9f0\n[110121.667414][    C7]  schedule+0x7c/0xe8\n[110121.667423][    C7]  kernfs_drain+0xb0/0x114\n[110121.667431][    C7]  __kernfs_remove+0x16c/0x20c\n[110121.667436][    C7]  kernfs_remove_by_name_ns+0x74/0xe8\n[110121.667442][    C7]  sysfs_remove_group+0x84/0xe8\n[110121.667450][    C7]  sysfs_remove_groups+0x34/0x58\n[110121.667458][    C7]  device_remove_groups+0x10/0x20\n[110121.667464][    C7]  device_release_driver_internal+0x164/0x2e4\n[110121.667475][    C7]  device_release_driver+0x18/0x28\n[110121.667484][    C7]  bus_remove_device+0xec/0x118\n[110121.667491][    C7]  device_del+0x1e8/0x4ac\n[110121.667498][    C7]  device_unregister+0x18/0x38\n[110121.667504][    C7]  typec_unregister_altmode+0x30/0x44\n[110121.667515][    C7]  tcpm_reset_port+0xac/0x370\n[110121.667523][    C7]  tcpm_snk_detach+0x84/0xb8\n[110121.667529][    C7]  run_state_machine+0x4c0/0x1b68\n[110121.667536][    C7]  tcpm_state_machine_work+0x94/0xe4\n[110121.667544][    C7]  kthread_worker_fn+0x10c/0x244\n[110121.667552][    C7]  kthread+0x104/0x1d4\n[110121.667557][    C7]  ret_from_fork+0x10/0x20\n\n[110121.667689][    C7] Workqueue: events dp_altmode_work\n[110121.667697][    C7] Call trace:\n[110121.667701][    C7]  __switch_to+0x174/0x338\n[110121.667710][    C7]  __schedule+0x608/0x9f0\n[110121.667717][    C7]  schedule+0x7c/0xe8\n[110121.667725][    C7]  schedule_preempt_disabled+0x24/0x40\n[110121.667733][    C7]  __mutex_lock+0x408/0xdac\n[110121.667741][    C7]  __mutex_lock_slowpath+0x14/0x24\n[110121.667748][    C7]  mutex_lock+0x40/0xec\n[110121.667757][    C7]  tcpm_altmode_enter+0x78/0xb4\n[110121.667764][    C7]  typec_altmode_enter+0xdc/0x10c\n[110121.667769][    C7]  dp_altmode_work+0x68/0x164\n[110121.667775][    C7]  process_one_work+0x1e4/0x43c\n[110121.667783][    C7]  worker_thread+0x25c/0x430\n[110121.667789][    C7]  kthread+0x104/0x1d4\n[110121.667794][    C7]  ret_from_fork+0x10/0x20\n\nChange tcpm_queue_vdm_unlocked to queue for tcpm_queue_vdm_work,\nwhich can perform the state check while holding the TCPM lock\nwhile the Alt Mode lock is no longer held. This requires a new\nstruct to hold the vdm data, altmode_vdm_event.\n\n## Affected\n\n- `Linux >= cdc9946ea6377e8e214b135ccc308c5e514ba25f < 7bdd712abefbec79176ab412d8c623e755c5d0ba`\n- `Linux >= cdc9946ea6377e8e214b135ccc308c5e514ba25f < 1970d34b48cbeceb0c765984c9a6bb204c77f16a`\n- `Linux >= cdc9946ea6377e8e214b135ccc308c5e514ba25f < 324d45e53f1a36c88bc649dc39e0c8300a41be0a`\n- `Linux 6.9`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}