Vulnerability-Lookup

GHSA-FFM7-CR74-H9F8

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-25 12:31

Details

In the Linux kernel, the following vulnerability has been resolved:

HID: appleir: fix UAF on pending key_up_timer in remove()

appleir_remove() runs hid_hw_stop() before timer_delete_sync(). hid_hw_stop() synchronously unregisters the HID input device via hid_disconnect() -> hidinput_disconnect() -> input_unregister_device(), which drops the last reference and frees the underlying input_dev when no userspace handle holds it open.

key_up_tick() reads appleir->input_dev and calls input_report_key() / input_sync() on it. The timer is armed from appleir_raw_event() with a HZ/8 (~125 ms) timeout on every keydown and key-repeat report. If a key was pressed shortly before the device is disconnected, the timer can fire after hid_hw_stop() has freed input_dev but before the teardown drains it.

A simple reorder is not sufficient. Putting the timer drain first still leaves a window where a USB URB completion (raw_event) running during hid_hw_stop() can call mod_timer() and re-arm the timer, which then fires after hidinput_disconnect() has freed input_dev. The same URB-completion window also lets raw_event() reach key_up(), key_down() and battery_flat() directly, all of which dereference appleir->input_dev.

Introduce a 'removing' flag on struct appleir, gated by the existing spinlock. appleir_remove() sets the flag under the lock and then shuts down the timer with timer_shutdown_sync(), which both drains any in-flight callback and permanently disables further mod_timer() calls. appleir_raw_event() and key_up_tick() bail out early if the flag is set, so no path can arm or run the timer, or dereference appleir->input_dev, after remove() has started tearing down.

The keyrepeat and flatbattery branches of appleir_raw_event() previously called into the input layer without holding the spinlock; take it now so the flag check is well-defined. This incidentally closes a pre-existing read-side race on appleir->current_key in the keyrepeat branch.

This bug is structurally a sibling of commit 4db2af929279 ("HID: appletb-kbd: fix UAF in inactivity-timer cleanup path") and has been present since the driver was introduced.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64363"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:18Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: appleir: fix UAF on pending key_up_timer in remove()\n\nappleir_remove() runs hid_hw_stop() before timer_delete_sync().\nhid_hw_stop() synchronously unregisters the HID input device via\nhid_disconnect() -\u003e hidinput_disconnect() -\u003e input_unregister_device(),\nwhich drops the last reference and frees the underlying input_dev when\nno userspace handle holds it open.\n\nkey_up_tick() reads appleir-\u003einput_dev and calls input_report_key() /\ninput_sync() on it.  The timer is armed from appleir_raw_event() with\na HZ/8 (~125 ms) timeout on every keydown and key-repeat report.  If a\nkey was pressed shortly before the device is disconnected, the timer\ncan fire after hid_hw_stop() has freed input_dev but before the\nteardown drains it.\n\nA simple reorder is not sufficient.  Putting the timer drain first\nstill leaves a window where a USB URB completion (raw_event) running\nduring hid_hw_stop() can call mod_timer() and re-arm the timer, which\nthen fires after hidinput_disconnect() has freed input_dev.  The same\nURB-completion window also lets raw_event() reach key_up(), key_down()\nand battery_flat() directly, all of which dereference\nappleir-\u003einput_dev.\n\nIntroduce a \u0027removing\u0027 flag on struct appleir, gated by the existing\nspinlock.  appleir_remove() sets the flag under the lock and then\nshuts down the timer with timer_shutdown_sync(), which both drains any\nin-flight callback and permanently disables further mod_timer() calls.\nappleir_raw_event() and key_up_tick() bail out early if the flag is\nset, so no path can arm or run the timer, or dereference\nappleir-\u003einput_dev, after remove() has started tearing down.\n\nThe keyrepeat and flatbattery branches of appleir_raw_event()\npreviously called into the input layer without holding the spinlock;\ntake it now so the flag check is well-defined.  This incidentally\ncloses a pre-existing read-side race on appleir-\u003ecurrent_key in the\nkeyrepeat branch.\n\nThis bug is structurally a sibling of commit 4db2af929279 (\"HID:\nappletb-kbd: fix UAF in inactivity-timer cleanup path\") and has been\npresent since the driver was introduced.",
  "id": "GHSA-ffm7-cr74-h9f8",
  "modified": "2026-07-25T12:31:33Z",
  "published": "2026-07-25T12:31:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64363"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/05e3decc55d1deca9410e0eb36466651fcbe57a5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3755f6e25776b8b12ddf062f9b573f05090e4034"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/37a52c61d4f78153c38ae1f7491dfcc8ac828dcf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3d30a0bb0e79621ae921b487835c56198adfafa3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6b0838e86da88b1d3bff86f19761ff25af73eaca"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/75fe87e19d8aff81eb2c64d15d244ab8da4de945"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/89ef67359672bf4cd6921524e39f61648fe38c0f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b363d964ca829c1761c9f04188dfa28f90b0f2d4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-64363 (GCVE-0-2026-64363)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:50 – Updated: 2026-07-25 08:50

Title

HID: appleir: fix UAF on pending key_up_timer in remove()

Summary

In the Linux kernel, the following vulnerability has been resolved: HID: appleir: fix UAF on pending key_up_timer in remove() appleir_remove() runs hid_hw_stop() before timer_delete_sync(). hid_hw_stop() synchronously unregisters the HID input device via hid_disconnect() -> hidinput_disconnect() -> input_unregister_device(), which drops the last reference and frees the underlying input_dev when no userspace handle holds it open. key_up_tick() reads appleir->input_dev and calls input_report_key() / input_sync() on it. The timer is armed from appleir_raw_event() with a HZ/8 (~125 ms) timeout on every keydown and key-repeat report. If a key was pressed shortly before the device is disconnected, the timer can fire after hid_hw_stop() has freed input_dev but before the teardown drains it. A simple reorder is not sufficient. Putting the timer drain first still leaves a window where a USB URB completion (raw_event) running during hid_hw_stop() can call mod_timer() and re-arm the timer, which then fires after hidinput_disconnect() has freed input_dev. The same URB-completion window also lets raw_event() reach key_up(), key_down() and battery_flat() directly, all of which dereference appleir->input_dev. Introduce a 'removing' flag on struct appleir, gated by the existing spinlock. appleir_remove() sets the flag under the lock and then shuts down the timer with timer_shutdown_sync(), which both drains any in-flight callback and permanently disables further mod_timer() calls. appleir_raw_event() and key_up_tick() bail out early if the flag is set, so no path can arm or run the timer, or dereference appleir->input_dev, after remove() has started tearing down. The keyrepeat and flatbattery branches of appleir_raw_event() previously called into the input layer without holding the spinlock; take it now so the flag check is well-defined. This incidentally closes a pre-existing read-side race on appleir->current_key in the keyrepeat branch. This bug is structurally a sibling of commit 4db2af929279 ("HID: appletb-kbd: fix UAF in inactivity-timer cleanup path") and has been present since the driver was introduced.

Severity

No CVSS data available.

Assigner

Linux

References

8 references

URL	Tags
https://git.kernel.org/stable/c/89ef67359672bf4cd…
https://git.kernel.org/stable/c/3d30a0bb0e79621ae…
https://git.kernel.org/stable/c/37a52c61d4f78153c…
https://git.kernel.org/stable/c/05e3decc55d1deca9…
https://git.kernel.org/stable/c/3755f6e25776b8b12…
https://git.kernel.org/stable/c/b363d964ca829c176…
https://git.kernel.org/stable/c/6b0838e86da88b1d3…
https://git.kernel.org/stable/c/75fe87e19d8aff81e…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 9a4a5574ce427c364d81746fc7fb82d86b5f1a7e , < 89ef67359672bf4cd6921524e39f61648fe38c0f (git) Affected: 9a4a5574ce427c364d81746fc7fb82d86b5f1a7e , < 3d30a0bb0e79621ae921b487835c56198adfafa3 (git) Affected: 9a4a5574ce427c364d81746fc7fb82d86b5f1a7e , < 37a52c61d4f78153c38ae1f7491dfcc8ac828dcf (git) Affected: 9a4a5574ce427c364d81746fc7fb82d86b5f1a7e , < 05e3decc55d1deca9410e0eb36466651fcbe57a5 (git) Affected: 9a4a5574ce427c364d81746fc7fb82d86b5f1a7e , < 3755f6e25776b8b12ddf062f9b573f05090e4034 (git) Affected: 9a4a5574ce427c364d81746fc7fb82d86b5f1a7e , < b363d964ca829c1761c9f04188dfa28f90b0f2d4 (git) Affected: 9a4a5574ce427c364d81746fc7fb82d86b5f1a7e , < 6b0838e86da88b1d3bff86f19761ff25af73eaca (git) Affected: 9a4a5574ce427c364d81746fc7fb82d86b5f1a7e , < 75fe87e19d8aff81eb2c64d15d244ab8da4de945 (git)
Linux	Linux	Affected: 3.10 Unaffected: 0 , < 3.10 (semver) Unaffected: 5.10.261 , ≤ 5.10.* (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc3 , ≤ * (original_commit_for_fix)

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JSON

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        {
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          "programFiles": [
            "drivers/hid/hid-appleir.c"
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              "version": "3.10"
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              "status": "unaffected",
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "5.10.261",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.1.178",
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              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
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              "version": "6.12.97",
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              "status": "unaffected",
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              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver"
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        }
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      "cpeApplicability": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: appleir: fix UAF on pending key_up_timer in remove()\n\nappleir_remove() runs hid_hw_stop() before timer_delete_sync().\nhid_hw_stop() synchronously unregisters the HID input device via\nhid_disconnect() -\u003e hidinput_disconnect() -\u003e input_unregister_device(),\nwhich drops the last reference and frees the underlying input_dev when\nno userspace handle holds it open.\n\nkey_up_tick() reads appleir-\u003einput_dev and calls input_report_key() /\ninput_sync() on it.  The timer is armed from appleir_raw_event() with\na HZ/8 (~125 ms) timeout on every keydown and key-repeat report.  If a\nkey was pressed shortly before the device is disconnected, the timer\ncan fire after hid_hw_stop() has freed input_dev but before the\nteardown drains it.\n\nA simple reorder is not sufficient.  Putting the timer drain first\nstill leaves a window where a USB URB completion (raw_event) running\nduring hid_hw_stop() can call mod_timer() and re-arm the timer, which\nthen fires after hidinput_disconnect() has freed input_dev.  The same\nURB-completion window also lets raw_event() reach key_up(), key_down()\nand battery_flat() directly, all of which dereference\nappleir-\u003einput_dev.\n\nIntroduce a \u0027removing\u0027 flag on struct appleir, gated by the existing\nspinlock.  appleir_remove() sets the flag under the lock and then\nshuts down the timer with timer_shutdown_sync(), which both drains any\nin-flight callback and permanently disables further mod_timer() calls.\nappleir_raw_event() and key_up_tick() bail out early if the flag is\nset, so no path can arm or run the timer, or dereference\nappleir-\u003einput_dev, after remove() has started tearing down.\n\nThe keyrepeat and flatbattery branches of appleir_raw_event()\npreviously called into the input layer without holding the spinlock;\ntake it now so the flag check is well-defined.  This incidentally\ncloses a pre-existing read-side race on appleir-\u003ecurrent_key in the\nkeyrepeat branch.\n\nThis bug is structurally a sibling of commit 4db2af929279 (\"HID:\nappletb-kbd: fix UAF in inactivity-timer cleanup path\") and has been\npresent since the driver was introduced."
        }
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      "providerMetadata": {
        "dateUpdated": "2026-07-25T08:50:18.824Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/6b0838e86da88b1d3bff86f19761ff25af73eaca"
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        {
          "url": "https://git.kernel.org/stable/c/75fe87e19d8aff81eb2c64d15d244ab8da4de945"
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      "title": "HID: appleir: fix UAF on pending key_up_timer in remove()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64363",
    "datePublished": "2026-07-25T08:50:18.824Z",
    "dateReserved": "2026-07-19T15:36:31.783Z",
    "dateUpdated": "2026-07-25T08:50:18.824Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

GHSA-FFM7-CR74-H9F8

CVE-2026-64363 (GCVE-0-2026-64363)

Tags

Sightings

Nomenclature