CVE-2025-38174 (GCVE-0-2025-38174)
Vulnerability from cvelistv5
Published
2025-07-04 10:39
Modified
2026-08-05 12:00
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: Do not double dequeue a configuration request Some of our devices crash in tb_cfg_request_dequeue(): general protection fault, probably for non-canonical address 0xdead000000000122 CPU: 6 PID: 91007 Comm: kworker/6:2 Tainted: G U W 6.6.65 RIP: 0010:tb_cfg_request_dequeue+0x2d/0xa0 Call Trace: <TASK> ? tb_cfg_request_dequeue+0x2d/0xa0 tb_cfg_request_work+0x33/0x80 worker_thread+0x386/0x8f0 kthread+0xed/0x110 ret_from_fork+0x38/0x50 ret_from_fork_asm+0x1b/0x30 The circumstances are unclear, however, the theory is that tb_cfg_request_work() can be scheduled twice for a request: first time via frame.callback from ring_work() and second time from tb_cfg_request(). Both times kworkers will execute tb_cfg_request_dequeue(), which results in double list_del() from the ctl->request_queue (the list poison deference hints at it: 0xdead000000000122). Do not dequeue requests that don't have TB_CFG_REQUEST_ACTIVE bit set.
References
Impacted products
Vendor Product Version
Linux Linux Version: 16603153666d22df544ae9f9b3764fd18da28eeb
Version: 16603153666d22df544ae9f9b3764fd18da28eeb
Version: 16603153666d22df544ae9f9b3764fd18da28eeb
Version: 16603153666d22df544ae9f9b3764fd18da28eeb
Version: 16603153666d22df544ae9f9b3764fd18da28eeb
Version: 16603153666d22df544ae9f9b3764fd18da28eeb
Version: 16603153666d22df544ae9f9b3764fd18da28eeb
Version: 16603153666d22df544ae9f9b3764fd18da28eeb
Version: 16603153666d22df544ae9f9b3764fd18da28eeb
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nthunderbolt: Do not double dequeue a configuration request\n\nSome of our devices crash in tb_cfg_request_dequeue():\n\n general protection fault, probably for non-canonical address 0xdead000000000122\n\n CPU: 6 PID: 91007 Comm: kworker/6:2 Tainted: G U W 6.6.65\n RIP: 0010:tb_cfg_request_dequeue+0x2d/0xa0\n Call Trace:\n \u003cTASK\u003e\n ? tb_cfg_request_dequeue+0x2d/0xa0\n tb_cfg_request_work+0x33/0x80\n worker_thread+0x386/0x8f0\n kthread+0xed/0x110\n ret_from_fork+0x38/0x50\n ret_from_fork_asm+0x1b/0x30\n\nThe circumstances are unclear, however, the theory is that\ntb_cfg_request_work() can be scheduled twice for a request:\nfirst time via frame.callback from ring_work() and second\ntime from tb_cfg_request().  Both times kworkers will execute\ntb_cfg_request_dequeue(), which results in double list_del()\nfrom the ctl-\u003erequest_queue (the list poison deference hints\nat it: 0xdead000000000122).\n\nDo not dequeue requests that don\u0027t have TB_CFG_REQUEST_ACTIVE\nbit set."
        }
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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              "lang": "en",
              "value": "AV:A - The vulnerable control-channel request queue is driven by packets received over the Thunderbolt/USB4 fabric, and the trigger is fully reachable by a peer host or device on the other end of a Thunderbolt link via the XDomain protocol (`tb_xdomain_handle_request()` \u2192 `tb_xdp_handle_request()` \u2192 `__tb_xdomain_response()`), matching the adjacent-topology model used for other Thunderbolt XDomain issues.\nAC:L - The attacker controls both sides of the race \u2014 it elicits the host\u0027s XDomain response (which is queued with `TB_CFG_REQUEST_ACTIVE` and immediately `schedule_work()`ed because `req-\u003eresponse` is NULL) and then injects a matching `XDOMAIN_RESP`/`ERROR` packet to schedule the same work a second time, with unlimited retries and no attacker-independent preconditions.\nPR:N - XDomain discovery requests are processed and answered before any device authorization or security-level gate (UUID/unknown-type requests are answered even when no `tb_xdomain` is registered), so no credentials or privileges on the target are required.\nUI:N - Once a Thunderbolt link exists (dock, daisy chain, host-to-host cable, or a device the attacker attaches), the attack proceeds purely from attacker-sent control packets with no action by the local user.\nS:U - The corruption and its consequences are confined to the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The duplicated work run drops an extra `tb_cfg_request_put()`, freeing the request while a second `tb_cfg_request_work()` still reads it \u2014 a use-after-free on a ~192\u2013256 byte kmalloc object that, combined with the attacker-controlled `kmemdup()` spray in `tb_xdp_schedule_request()`, yields a kernel memory disclosure primitive.\nI:H - The second run of the work item calls `req-\u003ecallback(req-\u003ecallback_data)` and `mutex_lock(\u0026req-\u003ectl-\u003erequest_queue_lock)`/`list_del()` on freed, reallocatable memory, giving an indirect call through an attacker-groomed function pointer plus list-based write primitives, i.e. potential control-flow hijack.\nA:H - The reported and readily reproduced outcome is a general protection fault in a kworker from the double `list_del()` on list poison, killing the worker while holding `ctl-\u003erequest_queue_lock`, which oopses the kernel and wedges the Thunderbolt control channel."
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        {
          "url": "https://git.kernel.org/stable/c/0a3011d47dbc92a33621861c423cb64833d7fe57"
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        {
          "url": "https://git.kernel.org/stable/c/2f62eda4d974c26bc595425eafd429067541f2c9"
        },
        {
          "url": "https://git.kernel.org/stable/c/85286e634ebbaf9c0fb1cdf580add2f33fc7628c"
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        {
          "url": "https://git.kernel.org/stable/c/5a057f261539720165d03d85024da2b52e67f63d"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38174",
    "datePublished": "2025-07-04T10:39:55.732Z",
    "dateReserved": "2025-04-16T04:51:23.991Z",
    "dateUpdated": "2026-08-05T12:00:05.295Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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