{
  "cveId": "CVE-2026-43327",
  "url": "https://patchblox.com/security/cve/CVE-2026-43327",
  "summary": "CVE-2026-43327 is fixed in 16 products on 1 platform, first by DEBIAN-CVE-2026-43327, released May 15, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  USB: dummy-hcd: Fix locking/synchronization erro...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  USB: dummy-hcd: Fix locking/synchronization error  Syzbot testing was able to provoke an addressing exception and crash in the usb_gadget_udc_reset() routine in drivers/usb/gadgets/udc/core.c, resulting from the fact that the routine was called with a second (\u0022driver\u0022) argument of NULL.  The bad caller was set_link_state() in dummy_hcd.c, and the problem arose because of a race between a USB reset and driver unbind.  These sorts of races were not supposed to be possible; commit 7dbd8f4cabd9 (\u0022USB: dummy-hcd: Fix erroneous synchronization change\u0022), along with a few followup commits, was written specifically to prevent them.  As it turns out, there are (at least) two errors remaining in the code.  Another patch will address the second error; this one is concerned with the first.  The error responsible for the syzbot crash occurred because the stop_activity() routine will sometimes drop and then re-acquire the dum-\u003Elock spinlock.  A call to stop_activity() occurs in set_link_state() when handling an emulated USB reset, after the test of dum-\u003Eints_enabled and before the increment of dum-\u003Ecallback_usage. This allowed another thread (doing a driver unbind) to sneak in and grab the spinlock, and then clear dum-\u003Eints_enabled and dum-\u003Edriver. Normally this other thread would have to wait for dum-\u003Ecallback_usage to go down to 0 before it would clear dum-\u003Edriver, but in this case it didn\u0027t have to wait since dum-\u003Ecallback_usage had not yet been incremented.  The fix is to increment dum-\u003Ecallback_usage _before_ calling stop_activity() instead of after.  Then the thread doing the unbind will not clear dum-\u003Edriver until after the call to usb_gadget_udc_reset() safely returns and dum-\u003Ecallback_usage has been decremented again.",
  "published": "2026-05-08T14:16:42Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00095,
  "epssPercentile": 0.00602,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
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      "fix": "OPENSUSE-SU-2026:21555-1",
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      "released": "2026-08-12T01:09:28Z"
    },
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      "fix": "OPENSUSE-SU-2026:21555-1",
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      "fix": "SUSE-SU-2026:3166-1",
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      "released": "2026-07-21T17:09:27Z"
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      "fix": "SUSE-SU-2026:23231-1",
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      "released": "2026-08-11T21:26:34Z"
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  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}