{"cve":"CVE-2026-64363","nvd":{"published":"2026-07-25T10:17:18.960","modified":"2026-09-04T15:56:32.810","status":"Analyzed","description":"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() -> hidinput_disconnect() -> 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->input_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->input_dev.\n\nIntroduce a 'removing' 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->input_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->current_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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":["CWE-416"],"references":["https://git.kernel.org/stable/c/05e3decc55d1deca9410e0eb36466651fcbe57a5","https://git.kernel.org/stable/c/3755f6e25776b8b12ddf062f9b573f05090e4034","https://git.kernel.org/stable/c/37a52c61d4f78153c38ae1f7491dfcc8ac828dcf","https://git.kernel.org/stable/c/3d30a0bb0e79621ae921b487835c56198adfafa3","https://git.kernel.org/stable/c/6b0838e86da88b1d3bff86f19761ff25af73eaca"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:46:40.600842820+00:00"},"epss":{"cve":"CVE-2026-64363","score":0.00169,"percentile":0.06199,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}