CVE-2026-64363 (GCVE-0-2026-64363)
Vulnerability from cvelistv5
Published
2026-07-25 08:50
Modified
2026-08-17 04:54
Severity ?
VLAI Severity ?
EPSS score ?
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 9a4a5574ce427c364d81746fc7fb82d86b5f1a7e Version: 9a4a5574ce427c364d81746fc7fb82d86b5f1a7e Version: 9a4a5574ce427c364d81746fc7fb82d86b5f1a7e Version: 9a4a5574ce427c364d81746fc7fb82d86b5f1a7e Version: 9a4a5574ce427c364d81746fc7fb82d86b5f1a7e Version: 9a4a5574ce427c364d81746fc7fb82d86b5f1a7e Version: 9a4a5574ce427c364d81746fc7fb82d86b5f1a7e Version: 9a4a5574ce427c364d81746fc7fb82d86b5f1a7e |
||
{
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{
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],
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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."
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T04:54:10.084Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/89ef67359672bf4cd6921524e39f61648fe38c0f"
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{
"url": "https://git.kernel.org/stable/c/3d30a0bb0e79621ae921b487835c56198adfafa3"
},
{
"url": "https://git.kernel.org/stable/c/37a52c61d4f78153c38ae1f7491dfcc8ac828dcf"
},
{
"url": "https://git.kernel.org/stable/c/05e3decc55d1deca9410e0eb36466651fcbe57a5"
},
{
"url": "https://git.kernel.org/stable/c/3755f6e25776b8b12ddf062f9b573f05090e4034"
},
{
"url": "https://git.kernel.org/stable/c/b363d964ca829c1761c9f04188dfa28f90b0f2d4"
},
{
"url": "https://git.kernel.org/stable/c/6b0838e86da88b1d3bff86f19761ff25af73eaca"
},
{
"url": "https://git.kernel.org/stable/c/75fe87e19d8aff81eb2c64d15d244ab8da4de945"
}
],
"title": "HID: appleir: fix UAF on pending key_up_timer in remove()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-64363",
"datePublished": "2026-07-25T08:50:18.824Z",
"dateReserved": "2026-07-19T15:36:31.783Z",
"dateUpdated": "2026-08-17T04:54:10.084Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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