CVE-2026-74575 (GCVE-0-2026-74575)
Vulnerability from cvelistv5
Published
2026-08-15 12:28
Modified
2026-08-23 12:47
Severity ?
8.8 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: thunderbolt: Prevent XDomain delayed work use-after-free on disconnect tb_xdp_handle_request() runs on system_wq and queues xd->state_work via queue_delayed_work() in three request handlers: PROPERTIES_CHANGED_REQUEST, UUID_REQUEST (via start_handshake), and LINK_STATE_CHANGE_REQUEST. Similarly, update_xdomain() queues xd->properties_changed_work when local properties change. Concurrently, tb_xdomain_remove() calls stop_handshake() which does cancel_delayed_work_sync() on both delayed works. Later, tb_xdomain_unregister() calls device_unregister() which eventually frees the xdomain. Since commit 559c1e1e0134 ("thunderbolt: Run tb_xdp_handle_request() in system workqueue") moved the request handler off tb->wq, the handler and the remove path are no longer serialized. If queue_delayed_work() executes after cancel_delayed_work_sync() but before the xdomain is freed, the delayed work fires on a freed object. Add xd->removing that tb_xdomain_remove() sets under xd->lock before calling stop_handshake(). Each external queue site holds the same lock and checks removing before calling queue_delayed_work(). This provides the mutual exclusion needed: either the queue site acquires the lock first and queues work that the subsequent cancel will see, or the remove path acquires the lock first and the queue site observes removing == true and skips the queue.
References
Impacted products
Vendor Product Version
Linux Linux Version: 559c1e1e013437bf190469efbcbd8bc803285853
Version: 559c1e1e013437bf190469efbcbd8bc803285853
Version: 559c1e1e013437bf190469efbcbd8bc803285853
Version: 559c1e1e013437bf190469efbcbd8bc803285853
Version: 559c1e1e013437bf190469efbcbd8bc803285853
Version: 559c1e1e013437bf190469efbcbd8bc803285853
Version: 559c1e1e013437bf190469efbcbd8bc803285853
Version: 559c1e1e013437bf190469efbcbd8bc803285853
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/thunderbolt/xdomain.c",
            "include/linux/thunderbolt.h"
          ],
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          "vendor": "Linux",
          "versions": [
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          ],
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          "vendor": "Linux",
          "versions": [
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            },
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              "version": "0",
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              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nthunderbolt: Prevent XDomain delayed work use-after-free on disconnect\n\ntb_xdp_handle_request() runs on system_wq and queues\nxd-\u003estate_work via queue_delayed_work() in three request handlers:\nPROPERTIES_CHANGED_REQUEST, UUID_REQUEST (via start_handshake),\nand LINK_STATE_CHANGE_REQUEST.  Similarly, update_xdomain() queues\nxd-\u003eproperties_changed_work when local properties change.\n\nConcurrently, tb_xdomain_remove() calls stop_handshake() which does\ncancel_delayed_work_sync() on both delayed works.  Later,\ntb_xdomain_unregister() calls device_unregister() which eventually\nfrees the xdomain.  Since commit 559c1e1e0134 (\"thunderbolt: Run\ntb_xdp_handle_request() in system workqueue\") moved the request\nhandler off tb-\u003ewq, the handler and the remove path are no longer\nserialized.  If queue_delayed_work() executes after\ncancel_delayed_work_sync() but before the xdomain is freed, the\ndelayed work fires on a freed object.\n\nAdd xd-\u003eremoving that tb_xdomain_remove() sets under xd-\u003elock\nbefore calling stop_handshake().  Each external queue site holds\nthe same lock and checks removing before calling\nqueue_delayed_work().  This provides the mutual exclusion needed:\neither the queue site acquires the lock first and queues work that\nthe subsequent cancel will see, or the remove path acquires the\nlock first and the queue site observes removing == true and skips\nthe queue."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - XDomain discovery packets reach the kernel over the Thunderbolt/USB4 control channel from a connected peer (adjacent host, dock, or inline device) on the shared physical link; no remote IP/network service is involved, but the attacker need not touch the victim chassis if they control the far end of an established TB connection.\nAC:L - The bug is a race between system_wq request handling and disconnect teardown; the peer attacker controls both sides by sending PROPERTIES_CHANGED, UUID, or LINK_STATE_CHANGE requests while forcing unplug/disconnect and can retry timing until delayed work is queued after cancel_delayed_work_sync().\nPR:N - No local account, capability, or root on the victim is required; any malicious or compromised Thunderbolt XDomain peer that can exchange discovery control-plane packets can trigger the vulnerable queue_delayed_work() paths without OS authentication.\nUI:N - During an active XDomain session the peer can send the triggering requests and force link teardown without any further victim action at exploit time; no additional mount, login, or sysfs operation is needed beyond the already-established Thunderbolt link.\nS:U - Impact is kernel heap use-after-free and memory corruption within kernel context; it does not directly cross VM, container, or IOMMU boundaries, though successful exploitation can yield standard local privilege escalation.\nC:H - Use-after-free on struct tb_xdomain lets attacker-influenced delayed work read freed kernel memory, enabling arbitrary kernel information disclosure and kernel pointer leaks that support further exploitation of the corruption primitive.\nI:H - Delayed work on the freed xdomain executes handshake state transitions, property/link updates, and hardware operations on attacker-reclaimed memory, enabling heap grooming and control-flow hijack for arbitrary kernel write/code execution.\nA:H - Accessing freed tb_xdomain via state_work or properties_changed_work causes kernel oops/panic or hang during disconnect, and a peer can repeat disconnect/request storms to deny Thunderbolt/XDomain services."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-23T12:47:35.374Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d4fa0d544c04dea636bf821ff5582cd7d63e2c34"
        },
        {
          "url": "https://git.kernel.org/stable/c/cfbd2dba3d862c9be8c92bea2a357d9ed828a54a"
        },
        {
          "url": "https://git.kernel.org/stable/c/dc11d5118f9da6ea28487ffe055de5a0d0734125"
        },
        {
          "url": "https://git.kernel.org/stable/c/91b40862a02000f490b63f1d315be3ee31e83871"
        },
        {
          "url": "https://git.kernel.org/stable/c/33c0ee18cf8665c974b00f4e0ba769fbc07efe10"
        },
        {
          "url": "https://git.kernel.org/stable/c/54a62153c765cd24239cde1f2633f2a2fd005368"
        },
        {
          "url": "https://git.kernel.org/stable/c/2aa2cde2cc79a79d8ea4a15be9f4a67fc528ae91"
        },
        {
          "url": "https://git.kernel.org/stable/c/2c5d2d3c3f70cde2565d7b279b544893a2035842"
        }
      ],
      "title": "thunderbolt: Prevent XDomain delayed work use-after-free on disconnect",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74575",
    "datePublished": "2026-08-15T12:28:13.187Z",
    "dateReserved": "2026-08-15T05:44:03.917Z",
    "dateUpdated": "2026-08-23T12:47:35.374Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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