CVE-2026-64363: HID: appleir: fix UAF on pending key_up_timer in remove()

High 7.8 EPSS 0.2% Linux kernel

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.

• CVE-2026-64363CVE identifier
• 7.8CVSS 3.1 base score (high)
• 0.2%EPSS: chance of exploitation in the next 30 days (higher than 6% of CVEs)
• 2026-07-25published

What do these terms mean? CVE · CVSS score · exploited (KEV) · EPSS · backported fix · all terms

Affected and fixed versions

Affected:

• Linux Linux 9a4a5574ce427c364d81746fc7fb82d86b5f1a7e to before 89ef67359672bf4cd6921524e39f61648fe38c0f
• Linux Linux 9a4a5574ce427c364d81746fc7fb82d86b5f1a7e to before 3d30a0bb0e79621ae921b487835c56198adfafa3
• Linux Linux 9a4a5574ce427c364d81746fc7fb82d86b5f1a7e to before 37a52c61d4f78153c38ae1f7491dfcc8ac828dcf
• Linux Linux 9a4a5574ce427c364d81746fc7fb82d86b5f1a7e to before 05e3decc55d1deca9410e0eb36466651fcbe57a5
• Linux Linux 9a4a5574ce427c364d81746fc7fb82d86b5f1a7e to before 3755f6e25776b8b12ddf062f9b573f05090e4034
• Linux Linux 9a4a5574ce427c364d81746fc7fb82d86b5f1a7e to before b363d964ca829c1761c9f04188dfa28f90b0f2d4
• Linux Linux 9a4a5574ce427c364d81746fc7fb82d86b5f1a7e to before 6b0838e86da88b1d3bff86f19761ff25af73eaca
• Linux Linux 9a4a5574ce427c364d81746fc7fb82d86b5f1a7e to before 75fe87e19d8aff81eb2c64d15d244ab8da4de945
• Linux Linux 3.10

Patch it

Use the commands for your system. Distribution packages often keep an older version number with the fix backported, so compare with the fixed package versions in the table below, not only with the upstream version.

sudo apt update
sudo apt install --only-upgrade linux-image-amd64

sudo apt update
sudo apt install --only-upgrade linux-image-generic (or the installed flavour: linux-image-aws, -azure, -gcp, -virtual)

sudo dnf upgrade --refresh kernel

sudo dnf upgrade --refresh kernel

sudo zypper refresh
sudo zypper update kernel-default

sudo dnf upgrade --releasever=latest kernel kernel6.12

sudo pacman -Syu

apk update && apk upgrade linux-lts linux-virt

not Linux

General update steps for every system are on the Linux and Unix & BSD pages; after updating, see which services to restart.

Fix status in Linux distributions

From the Debian security tracker, Ubuntu CVE tracker and Red Hat Security Data API, refreshed every few hours.

Sources

• https://git.kernel.org/stable/c/89ef67359672bf4cd6921524e39f61648fe38c0f
• https://git.kernel.org/stable/c/3d30a0bb0e79621ae921b487835c56198adfafa3
• https://git.kernel.org/stable/c/37a52c61d4f78153c38ae1f7491dfcc8ac828dcf
• https://git.kernel.org/stable/c/05e3decc55d1deca9410e0eb36466651fcbe57a5
• https://git.kernel.org/stable/c/3755f6e25776b8b12ddf062f9b573f05090e4034
• https://git.kernel.org/stable/c/b363d964ca829c1761c9f04188dfa28f90b0f2d4
• https://git.kernel.org/stable/c/6b0838e86da88b1d3bff86f19761ff25af73eaca
• https://git.kernel.org/stable/c/75fe87e19d8aff81eb2c64d15d244ab8da4de945
• CVE-2026-64363 on CVE.org
• CVE-2026-64363 on NVD

Page generated automatically from official sources on 2026-11-03 18:05 UTC. Always confirm with your vendor's advisory.