CVE-2026-68372 (GCVE-0-2026-68372)

Vulnerability from cvelistv5 – Published: 2026-08-10 12:03 – Updated: 2026-08-17 05:04
VLAI
Title
usb: core: port: Deattach Type-C connector on component unbind
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: core: port: Deattach Type-C connector on component unbind connector_unbind() is the mirror of connector_bind(), but it is missing the symmetric call to typec_deattach() that connector_bind() makes via: if (port_dev->child) typec_attach(port_dev->connector, &port_dev->child->dev); When a Thunderbolt dock is unplugged, two teardown paths race: 1. The component framework calls connector_unbind() first, which sets port_dev->connector = NULL without calling typec_deattach(). This leaves port->usb2_dev/port->usb3_dev in struct typec_port pointing at the USB device that is about to be freed. 2. usb_disconnect() then calls typec_deattach(port_dev->connector, ...), but port_dev->connector is already NULL, so the call is a no-op and port->usb2_dev is never cleared. 3. Concurrently, UCSI detects a PD partner-disconnect event and calls typec_unregister_partner(), which reads port->usb2_dev (now a dangling pointer to freed memory) and passes it to typec_partner_unlink_device() -> sysfs_remove_link() -> dev_name() on the freed device, corrupting the typec/UCSI partner state. This corruption leaves the Thunderbolt tunnel in an inconsistent state on the next dock hot-plug. On affected hardware the dock's I225/igc NIC fails to enumerate: AER fires a slot reset while the igc driver is still initialising ("PCIe link lost"), and the subsequent igc_reset attempt hits igc_rd32 on an already-detached device: igc 0000:2e:00.0 eth0: PCIe link lost, device now detached igc: Failed to read reg 0x0! WARNING: CPU: 9 PID: 129 at drivers/net/ethernet/intel/igc/igc_main.c:7005 igc_rd32+0xa4/0xc0 [igc] Call Trace: igc_disable_pcie_master+0x16/0xa0 [igc] igc_reset_hw_base+0x14/0x170 [igc] igc_reset+0x63/0x110 [igc] igc_io_slot_reset+0x9e/0xd0 [igc] report_slot_reset+0x5d/0xc0 pcie_do_recovery+0x209/0x400 aer_isr_one_error_type+0x235/0x430 aer_isr+0x4e/0x80 irq_thread+0xf4/0x1f0 4. UCSI later handles the PD partner-disconnect and calls typec_unregister_partner(), which still sees the stale port->usb2_dev and tries to remove its sysfs link a second time: kernfs: can not remove 'typec', no directory WARNING: CPU: 6 PID: 55 at fs/kernfs/dir.c:1706 kernfs_remove_by_name_ns+0xe9/0xf0 Workqueue: events ucsi_handle_connector_change [typec_ucsi] Call Trace: sysfs_remove_link+0x19/0x50 typec_unregister_partner+0x6e/0x120 [typec] ucsi_unregister_partner+0x107/0x150 [typec_ucsi] ucsi_handle_connector_change+0x3ec/0x490 [typec_ucsi] process_one_work+0x18e/0x3e0 worker_thread+0x2e3/0x420 kthread+0x10a/0x230 ret_from_fork+0x121/0x140 ret_from_fork_asm+0x1a/0x30 With worse timing the same stale pointer is dereferenced after the backing memory is freed, turning the warning into a use-after-free. Fix the asymmetry: call typec_deattach() before clearing port_dev->connector, matching what connector_bind() does on the bind side. typec_partner_deattach() is already protected by port->partner_link_lock, so it serialises safely with the concurrent typec_unregister_partner() path.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 11110783f5ea866318831a56353c6f1c3fc0d8ed , < 78d361e60caf1999d51bda0e1b1004f5d39fcfbc (git)
Affected: 11110783f5ea866318831a56353c6f1c3fc0d8ed , < 7714fb896ed308cf13d32d317040adc4f200b8e4 (git)
Affected: 11110783f5ea866318831a56353c6f1c3fc0d8ed , < e00109b5adf71635919248e9ab6300a662e6a3e8 (git)
Affected: 11110783f5ea866318831a56353c6f1c3fc0d8ed , < e0b291fe117964037e0ba382eff4bb365d531c3a (git)
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Linux Linux Affected: 6.7
Unaffected: 0 , < 6.7 (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/core/port.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "6.7"
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      ],
      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.101",
                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.42",
                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.6",
                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: core: port: Deattach Type-C connector on component unbind\n\nconnector_unbind() is the mirror of connector_bind(), but it is missing\nthe symmetric call to typec_deattach() that connector_bind() makes via:\n\n    if (port_dev-\u003echild)\n        typec_attach(port_dev-\u003econnector, \u0026port_dev-\u003echild-\u003edev);\n\nWhen a Thunderbolt dock is unplugged, two teardown paths race:\n\n1. The component framework calls connector_unbind() first, which sets\n   port_dev-\u003econnector = NULL without calling typec_deattach().  This\n   leaves port-\u003eusb2_dev/port-\u003eusb3_dev in struct typec_port pointing at\n   the USB device that is about to be freed.\n\n2. usb_disconnect() then calls typec_deattach(port_dev-\u003econnector, ...),\n   but port_dev-\u003econnector is already NULL, so the call is a no-op and\n   port-\u003eusb2_dev is never cleared.\n\n3. Concurrently, UCSI detects a PD partner-disconnect event and calls\n   typec_unregister_partner(), which reads port-\u003eusb2_dev (now a dangling\n   pointer to freed memory) and passes it to typec_partner_unlink_device()\n   -\u003e sysfs_remove_link() -\u003e dev_name() on the freed device, corrupting\n   the typec/UCSI partner state.\n\nThis corruption leaves the Thunderbolt tunnel in an inconsistent state on\nthe next dock hot-plug.  On affected hardware the dock\u0027s I225/igc NIC fails\nto enumerate: AER fires a slot reset while the igc driver is still\ninitialising (\"PCIe link lost\"), and the subsequent igc_reset attempt hits\nigc_rd32 on an already-detached device:\n\n    igc 0000:2e:00.0 eth0: PCIe link lost, device now detached\n    igc: Failed to read reg 0x0!\n    WARNING: CPU: 9 PID: 129 at drivers/net/ethernet/intel/igc/igc_main.c:7005\n             igc_rd32+0xa4/0xc0 [igc]\n    Call Trace:\n     igc_disable_pcie_master+0x16/0xa0 [igc]\n     igc_reset_hw_base+0x14/0x170 [igc]\n     igc_reset+0x63/0x110 [igc]\n     igc_io_slot_reset+0x9e/0xd0 [igc]\n     report_slot_reset+0x5d/0xc0\n     pcie_do_recovery+0x209/0x400\n     aer_isr_one_error_type+0x235/0x430\n     aer_isr+0x4e/0x80\n     irq_thread+0xf4/0x1f0\n\n4. UCSI later handles the PD partner-disconnect and calls\n   typec_unregister_partner(), which still sees the stale port-\u003eusb2_dev\n   and tries to remove its sysfs link a second time:\n\n   kernfs: can not remove \u0027typec\u0027, no directory\n   WARNING: CPU: 6 PID: 55 at fs/kernfs/dir.c:1706 kernfs_remove_by_name_ns+0xe9/0xf0\n   Workqueue: events ucsi_handle_connector_change [typec_ucsi]\n   Call Trace:\n    sysfs_remove_link+0x19/0x50\n    typec_unregister_partner+0x6e/0x120 [typec]\n    ucsi_unregister_partner+0x107/0x150 [typec_ucsi]\n    ucsi_handle_connector_change+0x3ec/0x490 [typec_ucsi]\n    process_one_work+0x18e/0x3e0\n    worker_thread+0x2e3/0x420\n    kthread+0x10a/0x230\n    ret_from_fork+0x121/0x140\n    ret_from_fork_asm+0x1a/0x30\n\n   With worse timing the same stale pointer is dereferenced after the\n   backing memory is freed, turning the warning into a use-after-free.\n\nFix the asymmetry: call typec_deattach() before clearing\nport_dev-\u003econnector, matching what connector_bind() does on the bind side.\ntypec_partner_deattach() is already protected by port-\u003epartner_link_lock,\nso it serialises safely with the concurrent typec_unregister_partner() path."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:04:17.570Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/78d361e60caf1999d51bda0e1b1004f5d39fcfbc"
        },
        {
          "url": "https://git.kernel.org/stable/c/7714fb896ed308cf13d32d317040adc4f200b8e4"
        },
        {
          "url": "https://git.kernel.org/stable/c/e00109b5adf71635919248e9ab6300a662e6a3e8"
        },
        {
          "url": "https://git.kernel.org/stable/c/e0b291fe117964037e0ba382eff4bb365d531c3a"
        }
      ],
      "title": "usb: core: port: Deattach Type-C connector on component unbind",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68372",
    "datePublished": "2026-08-10T12:03:50.292Z",
    "dateReserved": "2026-07-30T09:28:09.386Z",
    "dateUpdated": "2026-08-17T05:04:17.570Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-68372",
      "date": "2026-08-20",
      "epss": "0.00168",
      "percentile": "0.06508"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-68372\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-10T13:20:30.040\",\"lastModified\":\"2026-08-17T06:17:45.560\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nusb: core: port: Deattach Type-C connector on component unbind\\n\\nconnector_unbind() is the mirror of connector_bind(), but it is missing\\nthe symmetric call to typec_deattach() that connector_bind() makes via:\\n\\n    if (port_dev-\u003echild)\\n        typec_attach(port_dev-\u003econnector, \u0026port_dev-\u003echild-\u003edev);\\n\\nWhen a Thunderbolt dock is unplugged, two teardown paths race:\\n\\n1. The component framework calls connector_unbind() first, which sets\\n   port_dev-\u003econnector = NULL without calling typec_deattach().  This\\n   leaves port-\u003eusb2_dev/port-\u003eusb3_dev in struct typec_port pointing at\\n   the USB device that is about to be freed.\\n\\n2. usb_disconnect() then calls typec_deattach(port_dev-\u003econnector, ...),\\n   but port_dev-\u003econnector is already NULL, so the call is a no-op and\\n   port-\u003eusb2_dev is never cleared.\\n\\n3. Concurrently, UCSI detects a PD partner-disconnect event and calls\\n   typec_unregister_partner(), which reads port-\u003eusb2_dev (now a dangling\\n   pointer to freed memory) and passes it to typec_partner_unlink_device()\\n   -\u003e sysfs_remove_link() -\u003e dev_name() on the freed device, corrupting\\n   the typec/UCSI partner state.\\n\\nThis corruption leaves the Thunderbolt tunnel in an inconsistent state on\\nthe next dock hot-plug.  On affected hardware the dock\u0027s I225/igc NIC fails\\nto enumerate: AER fires a slot reset while the igc driver is still\\ninitialising (\\\"PCIe link lost\\\"), and the subsequent igc_reset attempt hits\\nigc_rd32 on an already-detached device:\\n\\n    igc 0000:2e:00.0 eth0: PCIe link lost, device now detached\\n    igc: Failed to read reg 0x0!\\n    WARNING: CPU: 9 PID: 129 at drivers/net/ethernet/intel/igc/igc_main.c:7005\\n             igc_rd32+0xa4/0xc0 [igc]\\n    Call Trace:\\n     igc_disable_pcie_master+0x16/0xa0 [igc]\\n     igc_reset_hw_base+0x14/0x170 [igc]\\n     igc_reset+0x63/0x110 [igc]\\n     igc_io_slot_reset+0x9e/0xd0 [igc]\\n     report_slot_reset+0x5d/0xc0\\n     pcie_do_recovery+0x209/0x400\\n     aer_isr_one_error_type+0x235/0x430\\n     aer_isr+0x4e/0x80\\n     irq_thread+0xf4/0x1f0\\n\\n4. UCSI later handles the PD partner-disconnect and calls\\n   typec_unregister_partner(), which still sees the stale port-\u003eusb2_dev\\n   and tries to remove its sysfs link a second time:\\n\\n   kernfs: can not remove \u0027typec\u0027, no directory\\n   WARNING: CPU: 6 PID: 55 at fs/kernfs/dir.c:1706 kernfs_remove_by_name_ns+0xe9/0xf0\\n   Workqueue: events ucsi_handle_connector_change [typec_ucsi]\\n   Call Trace:\\n    sysfs_remove_link+0x19/0x50\\n    typec_unregister_partner+0x6e/0x120 [typec]\\n    ucsi_unregister_partner+0x107/0x150 [typec_ucsi]\\n    ucsi_handle_connector_change+0x3ec/0x490 [typec_ucsi]\\n    process_one_work+0x18e/0x3e0\\n    worker_thread+0x2e3/0x420\\n    kthread+0x10a/0x230\\n    ret_from_fork+0x121/0x140\\n    ret_from_fork_asm+0x1a/0x30\\n\\n   With worse timing the same stale pointer is dereferenced after the\\n   backing memory is freed, turning the warning into a use-after-free.\\n\\nFix the asymmetry: call typec_deattach() before clearing\\nport_dev-\u003econnector, matching what connector_bind() does on the bind side.\\ntypec_partner_deattach() is already protected by port-\u003epartner_link_lock,\\nso it serialises safely with the concurrent typec_unregister_partner() path.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/usb/core/port.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"11110783f5ea866318831a56353c6f1c3fc0d8ed\",\"lessThan\":\"78d361e60caf1999d51bda0e1b1004f5d39fcfbc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"11110783f5ea866318831a56353c6f1c3fc0d8ed\",\"lessThan\":\"7714fb896ed308cf13d32d317040adc4f200b8e4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"11110783f5ea866318831a56353c6f1c3fc0d8ed\",\"lessThan\":\"e00109b5adf71635919248e9ab6300a662e6a3e8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"11110783f5ea866318831a56353c6f1c3fc0d8ed\",\"lessThan\":\"e0b291fe117964037e0ba382eff4bb365d531c3a\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/usb/core/port.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.7\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.7\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.101\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.42\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.6\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/7714fb896ed308cf13d32d317040adc4f200b8e4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/78d361e60caf1999d51bda0e1b1004f5d39fcfbc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e00109b5adf71635919248e9ab6300a662e6a3e8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e0b291fe117964037e0ba382eff4bb365d531c3a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-11T16:45:38+00:00",
      "cve": "CVE-2026-68372",
      "id": "CVE-2026-68372",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: usb: core: port: Deattach Type-C connector on component unbind",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68372.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-14T23:44:35Z",
      "cve": "CVE-2026-68372",
      "id": "CVE-2026-68372",
      "initial_release_date": "2026-08-14T17:13:44Z",
      "product_status:known_affected": "30",
      "product_status:known_not_affected": "266",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68372",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68372.json",
      "version": "3"
    }
  }
}



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