{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "04145a03db9d78469e0817ab3a767c76c0fb0947"
            },
            {
              "fixed": "d847f375b1bcea713143bc02720d13d2d01b012a"
            },
            {
              "fixed": "cbf7df5e5d27cd5bea92ee9a75a4b28dbcc718d4"
            },
            {
              "fixed": "5aa776c8615bea3b1eaeec87b0788375800ead4f"
            },
            {
              "fixed": "94d4fab1dd9e64f45449bcc7d6a5acf796b13015"
            },
            {
              "fixed": "5687a09776069bd915560021c9728ca528440128"
            },
            {
              "fixed": "8bcd80219d8e10e660bf29b20e41bb8beb4e4cb7"
            },
            {
              "fixed": "2ca9e46f8f1f5a297eb0ac83f79d35d5b3a02541"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.14.0"
            },
            {
              "fixed": "5.15.203"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.168"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.134"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.81"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.22"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.12"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43324.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: dummy-hcd: Fix interrupt synchronization error\n\nThis fixes an error in synchronization in the dummy-hcd driver.  The\nerror has a somewhat involved history.  The synchronization mechanism\nwas introduced by commit 7dbd8f4cabd9 (\"USB: dummy-hcd: Fix erroneous\nsynchronization change\"), which added an emulated \"interrupts enabled\"\nflag together with code emulating synchronize_irq() (it waits until\nall current handler callbacks have returned).\n\nBut the emulated interrupt-disable occurred too late, after the driver\ncontaining the handler callback routines had been told that it was\nunbound and no more callbacks would occur.  Commit 4a5d797a9f9c (\"usb:\ngadget: dummy_hcd: fix gpf in gadget_setup\") tried to fix this by\nmoving the synchronize_irq() emulation code from dummy_stop() to\ndummy_pullup(), which runs before the unbind callback.\n\nThere still were races, though, because the emulated interrupt-disable\nstill occurred too late.  It couldn't be moved to dummy_pullup(),\nbecause that routine can be called for reasons other than an impending\nunbind.  Therefore commits 7dc0c55e9f30 (\"USB: UDC core: Add\nudc_async_callbacks gadget op\") and 04145a03db9d (\"USB: UDC: Implement\nudc_async_callbacks in dummy-hcd\") added an API allowing the UDC core\nto tell dummy-hcd exactly when emulated interrupts and their callbacks\nshould be disabled.\n\nThat brings us to the current state of things, which is still wrong\nbecause the emulated synchronize_irq() occurs before the emulated\ninterrupt-disable!  That's no good, beause it means that more emulated\ninterrupts can occur after the synchronize_irq() emulation has run,\nleading to the possibility that a callback handler may be running when\nthe gadget driver is unbound.\n\nTo fix this, we have to move the synchronize_irq() emulation code yet\nagain, to the dummy_udc_async_callbacks() routine, which takes care of\nenabling and disabling emulated interrupt requests.  The\nsynchronization will now run immediately after emulated interrupts are\ndisabled, which is where it belongs.",
  "id": "CVE-2026-43324",
  "modified": "2026-07-08T05:36:48.476202861Z",
  "published": "2026-05-08T13:31:08.850Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2ca9e46f8f1f5a297eb0ac83f79d35d5b3a02541"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5687a09776069bd915560021c9728ca528440128"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5aa776c8615bea3b1eaeec87b0788375800ead4f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8bcd80219d8e10e660bf29b20e41bb8beb4e4cb7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/94d4fab1dd9e64f45449bcc7d6a5acf796b13015"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cbf7df5e5d27cd5bea92ee9a75a4b28dbcc718d4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d847f375b1bcea713143bc02720d13d2d01b012a"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43324.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43324"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "USB: dummy-hcd: Fix interrupt synchronization error"
}