{"id":"CVE-2026-64363","summary":"HID: appleir: fix UAF on pending key_up_timer in remove()","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 '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-\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.","modified":"2026-07-27T04:03:21.888499242Z","published":"2026-07-25T08:50:18.824Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64363.json"},"references":[{"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"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64363.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64363"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"9a4a5574ce427c364d81746fc7fb82d86b5f1a7e"},{"fixed":"89ef67359672bf4cd6921524e39f61648fe38c0f"},{"fixed":"3d30a0bb0e79621ae921b487835c56198adfafa3"},{"fixed":"37a52c61d4f78153c38ae1f7491dfcc8ac828dcf"},{"fixed":"05e3decc55d1deca9410e0eb36466651fcbe57a5"},{"fixed":"3755f6e25776b8b12ddf062f9b573f05090e4034"},{"fixed":"b363d964ca829c1761c9f04188dfa28f90b0f2d4"},{"fixed":"6b0838e86da88b1d3bff86f19761ff25af73eaca"},{"fixed":"75fe87e19d8aff81eb2c64d15d244ab8da4de945"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64363.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.10.0"},{"fixed":"5.10.261"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.212"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.178"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.145"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.97"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.39"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64363.json"}}],"schema_version":"1.7.5"}