{
  "cveId": "CVE-2026-43324",
  "url": "https://patchblox.com/security/cve/CVE-2026-43324",
  "summary": "CVE-2026-43324 is fixed in 16 products on 1 platform, first by DEBIAN-CVE-2026-43324, released May 15, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  USB: dummy-hcd: Fix interrupt synchronization er...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  USB: dummy-hcd: Fix interrupt synchronization error  This fixes an error in synchronization in the dummy-hcd driver.  The error has a somewhat involved history.  The synchronization mechanism was introduced by commit 7dbd8f4cabd9 (\u0022USB: dummy-hcd: Fix erroneous synchronization change\u0022), which added an emulated \u0022interrupts enabled\u0022 flag together with code emulating synchronize_irq() (it waits until all current handler callbacks have returned).  But the emulated interrupt-disable occurred too late, after the driver containing the handler callback routines had been told that it was unbound and no more callbacks would occur.  Commit 4a5d797a9f9c (\u0022usb: gadget: dummy_hcd: fix gpf in gadget_setup\u0022) tried to fix this by moving the synchronize_irq() emulation code from dummy_stop() to dummy_pullup(), which runs before the unbind callback.  There still were races, though, because the emulated interrupt-disable still occurred too late.  It couldn\u0027t be moved to dummy_pullup(), because that routine can be called for reasons other than an impending unbind.  Therefore commits 7dc0c55e9f30 (\u0022USB: UDC core: Add udc_async_callbacks gadget op\u0022) and 04145a03db9d (\u0022USB: UDC: Implement udc_async_callbacks in dummy-hcd\u0022) added an API allowing the UDC core to tell dummy-hcd exactly when emulated interrupts and their callbacks should be disabled.  That brings us to the current state of things, which is still wrong because the emulated synchronize_irq() occurs before the emulated interrupt-disable!  That\u0027s no good, beause it means that more emulated interrupts can occur after the synchronize_irq() emulation has run, leading to the possibility that a callback handler may be running when the gadget driver is unbound.  To fix this, we have to move the synchronize_irq() emulation code yet again, to the dummy_udc_async_callbacks() routine, which takes care of enabling and disabling emulated interrupt requests.  The synchronization will now run immediately after emulated interrupts are disabled, which is where it belongs.",
  "published": "2026-05-08T14:16:41Z",
  "severity": "high",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.0013,
  "epssPercentile": 0.02629,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
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      "platform": "linux",
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      "release": "opensuse-leap 16.0",
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      "fix": "OPENSUSE-SU-2026:21555-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21555-1",
      "released": "2026-08-12T01:09:28Z"
    },
    {
      "platform": "linux",
      "product": "kernel-64kb",
      "release": "opensuse-leap 16.0",
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      "fix": "OPENSUSE-SU-2026:21555-1",
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      "released": "2026-08-12T01:09:28Z"
    },
    {
      "platform": "linux",
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      "release": "sles 15.7",
      "fixedVersion": "6.4.0-150700.53.73.2",
      "fix": "SUSE-SU-2026:3166-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-3166-1",
      "released": "2026-07-21T17:09:27Z"
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    {
      "platform": "linux",
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      "fix": "SUSE-SU-2026:23231-1",
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      "released": "2026-08-11T21:26:34Z"
    },
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      "platform": "linux",
      "product": "kernel-azure",
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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"
  }
}