HID: letsketch: fix UAF on inrange_timer at driver unbind

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64365
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-25 10:17:19 UTC
Updated2026-07-25 10:17:19 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: HID: letsketch: fix UAF on inrange_timer at driver unbind letsketch_driver does not provide a .remove callback, but letsketch_probe() arms a per-device timer: timer_setup(&data->inrange_timer, letsketch_inrange_timeout, 0); The timer is re-armed from letsketch_raw_event() with a 100 ms timeout on every pen-in-range report, and its callback dereferences data->input_tablet to deliver a synthetic BTN_TOOL_PEN release. letsketch_data is allocated with devm_kzalloc(), and its input_dev fields are devm-allocated via letsketch_setup_input_tablet(). On device unbind (USB unplug or rmmod), the HID core runs its default teardown and devm cleanup frees both letsketch_data and the input devices. Because no .remove callback exists, nothing drains the timer first: if raw_event armed it within ~100 ms of the unbind, the pending timer fires on freed memory. This is a UAF read of data and of data->input_tablet, followed by input_report_key() / input_sync() into the freed input_dev. The same problem can occur on the probe error path: if hid_hw_start() enabled I/O on an always-poll-quirk device and then failed, raw_event may have armed the timer before devm releases data. Fix by adding a .remove callback that calls hid_hw_stop() first. hid_hw_stop() synchronously kills the URBs that deliver raw_event(), so once it returns no path can re-arm the timer. timer_shutdown_sync() then drains any in-flight callback and permanently disables further mod_timer() calls. Apply the same timer_shutdown_sync() in the probe error path so the timer is guaranteed not to outlive data.

Risk And Classification

EPSS: 0.001730000 probability, percentile 0.069670000 (date 2026-07-28)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 33a5c2793451770cb6dcf0cc35c76cfd4b045513 2bb6e7143cf70ed281822d26c1848b2897ac36e9 git Not specified
CNA Linux Linux affected 33a5c2793451770cb6dcf0cc35c76cfd4b045513 523db788c0f84612707638e266e8957ca7e3a756 git Not specified
CNA Linux Linux affected 33a5c2793451770cb6dcf0cc35c76cfd4b045513 17f5928d7010bc9e002930326b59e60e40c09ee3 git Not specified
CNA Linux Linux affected 33a5c2793451770cb6dcf0cc35c76cfd4b045513 3eca1a8165b5e7996e699e9df76cb4645e184d42 git Not specified
CNA Linux Linux affected 33a5c2793451770cb6dcf0cc35c76cfd4b045513 df3d8aa1a9392da3de66398e7a03422463806b21 git Not specified
CNA Linux Linux affected 33a5c2793451770cb6dcf0cc35c76cfd4b045513 46c8beeccd8ab2c863827254a85ea877654a3534 git Not specified
CNA Linux Linux affected 5.17 Not specified
CNA Linux Linux unaffected 5.17 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 6.12.96 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/46c8beeccd8ab2c863827254a85ea877654a3534 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/df3d8aa1a9392da3de66398e7a03422463806b21 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2bb6e7143cf70ed281822d26c1848b2897ac36e9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/523db788c0f84612707638e266e8957ca7e3a756 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/17f5928d7010bc9e002930326b59e60e40c09ee3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3eca1a8165b5e7996e699e9df76cb4645e184d42 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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