CVE-2025-38268 (GCVE-0-2025-38268)

Vulnerability from cvelistv5 – Published: 2025-07-10 07:41 – Updated: 2025-07-28 04:16
VLAI?
Title
usb: typec: tcpm: move tcpm_queue_vdm_unlocked to asynchronous work
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: cdc9946ea6377e8e214b135ccc308c5e514ba25f , < 7bdd712abefbec79176ab412d8c623e755c5d0ba (git)
Affected: cdc9946ea6377e8e214b135ccc308c5e514ba25f , < 1970d34b48cbeceb0c765984c9a6bb204c77f16a (git)
Affected: cdc9946ea6377e8e214b135ccc308c5e514ba25f , < 324d45e53f1a36c88bc649dc39e0c8300a41be0a (git)
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    Linux Linux Affected: 6.9
Unaffected: 0 , < 6.9 (semver)
Unaffected: 6.12.34 , ≤ 6.12.* (semver)
Unaffected: 6.15.3 , ≤ 6.15.* (semver)
Unaffected: 6.16 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/typec/tcpm/tcpm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "7bdd712abefbec79176ab412d8c623e755c5d0ba",
              "status": "affected",
              "version": "cdc9946ea6377e8e214b135ccc308c5e514ba25f",
              "versionType": "git"
            },
            {
              "lessThan": "1970d34b48cbeceb0c765984c9a6bb204c77f16a",
              "status": "affected",
              "version": "cdc9946ea6377e8e214b135ccc308c5e514ba25f",
              "versionType": "git"
            },
            {
              "lessThan": "324d45e53f1a36c88bc649dc39e0c8300a41be0a",
              "status": "affected",
              "version": "cdc9946ea6377e8e214b135ccc308c5e514ba25f",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/typec/tcpm/tcpm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.9"
            },
            {
              "lessThan": "6.9",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.34",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.15.*",
              "status": "unaffected",
              "version": "6.15.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.16",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.34",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.15.3",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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 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\u0027s cancel_work_sync call.\n\nBecause the state check isn\u0027t 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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-07-28T04:16:48.451Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
        }
      ],
      "title": "usb: typec: tcpm: move tcpm_queue_vdm_unlocked to asynchronous work",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38268",
    "datePublished": "2025-07-10T07:41:51.217Z",
    "dateReserved": "2025-04-16T04:51:23.998Z",
    "dateUpdated": "2025-07-28T04:16:48.451Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}


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