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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64363
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-25 10:17:18 UTC
Updated2026-07-25 10:17:18 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.002110000 probability, percentile 0.114700000 (date 2026-07-28)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 9a4a5574ce427c364d81746fc7fb82d86b5f1a7e 89ef67359672bf4cd6921524e39f61648fe38c0f git Not specified
CNA Linux Linux affected 9a4a5574ce427c364d81746fc7fb82d86b5f1a7e 3d30a0bb0e79621ae921b487835c56198adfafa3 git Not specified
CNA Linux Linux affected 9a4a5574ce427c364d81746fc7fb82d86b5f1a7e 37a52c61d4f78153c38ae1f7491dfcc8ac828dcf git Not specified
CNA Linux Linux affected 9a4a5574ce427c364d81746fc7fb82d86b5f1a7e 05e3decc55d1deca9410e0eb36466651fcbe57a5 git Not specified
CNA Linux Linux affected 9a4a5574ce427c364d81746fc7fb82d86b5f1a7e 3755f6e25776b8b12ddf062f9b573f05090e4034 git Not specified
CNA Linux Linux affected 9a4a5574ce427c364d81746fc7fb82d86b5f1a7e b363d964ca829c1761c9f04188dfa28f90b0f2d4 git Not specified
CNA Linux Linux affected 9a4a5574ce427c364d81746fc7fb82d86b5f1a7e 6b0838e86da88b1d3bff86f19761ff25af73eaca git Not specified
CNA Linux Linux affected 9a4a5574ce427c364d81746fc7fb82d86b5f1a7e 75fe87e19d8aff81eb2c64d15d244ab8da4de945 git Not specified
CNA Linux Linux affected 3.10 Not specified
CNA Linux Linux unaffected 3.10 semver Not specified
CNA Linux Linux unaffected 5.10.261 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.212 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.39 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.4 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/75fe87e19d8aff81eb2c64d15d244ab8da4de945 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/37a52c61d4f78153c38ae1f7491dfcc8ac828dcf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b363d964ca829c1761c9f04188dfa28f90b0f2d4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3755f6e25776b8b12ddf062f9b573f05090e4034 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6b0838e86da88b1d3bff86f19761ff25af73eaca 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3d30a0bb0e79621ae921b487835c56198adfafa3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/89ef67359672bf4cd6921524e39f61648fe38c0f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/05e3decc55d1deca9410e0eb36466651fcbe57a5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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