CVE-2026-97986 (GCVE-0-2026-97986)
Vulnerability from cvelistv5
Published
2026-09-25 10:23
Modified
2026-10-19 09:11
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: virtio_input: stop callbacks before unregistering input device virtinput_remove() unregisters the input device before resetting the virtio device. virtinput_recv_events() drops vi->lock around input_event(), so clearing vi->ready does not stop a callback that passed the entry check. It can still use vi->idev, requeue buffers and kick the queue. Reset first, as virtinput_freeze() already does. With the preceding core change, reset waits for callbacks before input_unregister_device() can free vi->idev. Recheck vi->ready after taking the lock again: keep draining completed events so an input packet is not truncated, but stop requeueing buffers and kicking the queue. With evdev attached, input_unregister_handle() currently waits for an RCU grace period, which also waits out IRQ callbacks. This masks the lifetime bug on PCI and MMIO, but does not protect sleepable callbacks on other transports.
References
Impacted products
Vendor Product Version
Linux Linux Version: 271c865161c57cfabca45b93eaa712b19da365bc
Version: 271c865161c57cfabca45b93eaa712b19da365bc
Version: 271c865161c57cfabca45b93eaa712b19da365bc
Version: 271c865161c57cfabca45b93eaa712b19da365bc
Version: 271c865161c57cfabca45b93eaa712b19da365bc
Version: 271c865161c57cfabca45b93eaa712b19da365bc
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{
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          "programFiles": [
            "drivers/virtio/virtio_input.c"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvirtio_input: stop callbacks before unregistering input device\n\nvirtinput_remove() unregisters the input device before resetting the\nvirtio device. virtinput_recv_events() drops vi-\u003elock around input_event(),\nso clearing vi-\u003eready does not stop a callback that passed the entry check.\nIt can still use vi-\u003eidev, requeue buffers and kick the queue.\n\nReset first, as virtinput_freeze() already does. With the preceding core\nchange, reset waits for callbacks before input_unregister_device() can\nfree vi-\u003eidev. Recheck vi-\u003eready after taking the lock again: keep draining\ncompleted events so an input packet is not truncated, but stop requeueing\nbuffers and kicking the queue.\n\nWith evdev attached, input_unregister_handle() currently waits for an RCU\ngrace period, which also waits out IRQ callbacks. This masks the lifetime\nbug on PCI and MMIO, but does not protect sleepable callbacks on other\ntransports."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:11:53.304Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3ae729b1f8ab81d1244061872db2fb0ebb110d2a"
        },
        {
          "url": "https://git.kernel.org/stable/c/81073bca2062c916c818f2744fbab545a5c4982b"
        },
        {
          "url": "https://git.kernel.org/stable/c/8226aeee9b9a94cd699fbb51cb230feff46cfaf2"
        },
        {
          "url": "https://git.kernel.org/stable/c/a3ba86a270dd87460759214046dc7cbd409ac711"
        },
        {
          "url": "https://git.kernel.org/stable/c/5378f7945856a5ed88e6f9850bc7a68f54090135"
        },
        {
          "url": "https://git.kernel.org/stable/c/d7808b37da0a619cf1fa541c2384e783fecc2480"
        }
      ],
      "title": "virtio_input: stop callbacks before unregistering input device",
      "x_generator": {
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-97986",
    "datePublished": "2026-09-25T10:23:20.801Z",
    "dateReserved": "2026-09-25T10:18:58.208Z",
    "dateUpdated": "2026-10-19T09:11:53.304Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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