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HID: multitouch: stop the release timer from being rearmed on remove

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: HID: multitouch: stop the release timer from being rearmed on remove mt_remove() quiesces the sticky-finger timer before stopping the hardware: timer_delete_sync(&td->release_timer); sysfs_remove_group(&hdev->dev.kobj, &mt_attribute_group); hid_hw_stop(hdev); timer_delete_sync() waits for a running callback and dequeues the timer, but it does not stop the timer from being armed again. The transport is still delivering reports at that point, and the report path rearms it: if (app->quirks & MT_QUIRK_STICKY_FINGERS) { if (td->mt_io_flags & MT_IO_SLOTS_MASK) mod_timer(&td->release_timer, jiffies + msecs_to_jiffies(100)); A report that arrives after timer_delete_sync() has returned therefore leaves the timer queued. td is allocated with devm_kzalloc() against hdev->dev, so it is freed when the driver is unbound, after mt_remove() returns. When the timer fires afterwards, mt_expired_timeout() dereferences the freed td: struct mt_device *td = timer_container_of(td, t, release_timer); struct hid_device *hdev = td->hdev; if (test_and_set_bit_lock(MT_IO_FLAGS_RUNNING, &td->mt_io_flags)) Simply moving the teardown after hid_hw_stop() does not fix this on its own, because mt_expired_timeout() calls mt_release_contacts(), which walks hdev->inputs; the timer still has to be quiesced before hid_hw_stop() tears the input devices down. Use timer_shutdown_sync() instead, which additionally makes any later mod_timer() a no-op,

Announced Source revision 1
Original source ↗

CVE-2026-98859

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-98859

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
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Prerequisites
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Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4f4001bc76fd1a138a501fbd3d68cce72cbf96ce",
        "lessThan": "3776f34fbce990af45978f1628d2e1adc0d67d0f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4f4001bc76fd1a138a501fbd3d68cce72cbf96ce",
        "lessThan": "1f1bd9a3117f082eb891c0986c4f0e04cd974c9a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4f4001bc76fd1a138a501fbd3d68cce72cbf96ce",
        "lessThan": "0c19a6c1d25fd5ed66d1f80dc6f6e56cc1f0a787",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4f4001bc76fd1a138a501fbd3d68cce72cbf96ce",
        "lessThan": "a0125ca86e405b8a704e96157a6c10ca51087652",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4f4001bc76fd1a138a501fbd3d68cce72cbf96ce",
        "lessThan": "5acb2dace582f061aab5e14c399ac9480315f44b",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/hid/hid-multitouch.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.13"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.13",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.160",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.113",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.56",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.10",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/hid/hid-multitouch.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-98859

Source reference: /cveMetadata/cveId

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Event
#49012 · Revision 1
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