HID: uclogic: fix use-after-free of inrange_timer on remove

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-80766
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-04 16:18:01 UTC
Updated2026-09-04 16:18:01 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: HID: uclogic: fix use-after-free of inrange_timer on remove uclogic_remove() cancels the pen in-range timer and then stops the device: timer_delete_sync(&drvdata->inrange_timer); hid_hw_stop(hdev); timer_delete_sync() only guarantees the timer is idle at that instant. uclogic_raw_event_pen() keeps delivering pen reports until hid_hw_stop() stops the transport several lines later, and every report with pen->inrange == UCLOGIC_PARAMS_PEN_INRANGE_NONE re-arms the timer: mod_timer(&drvdata->inrange_timer, jiffies + msecs_to_jiffies(100)); A report landing between the timer_delete_sync() call and the transport teardown in hid_hw_stop() re-arms inrange_timer after it was cancelled. uclogic_remove() then returns and the devm drvdata is freed, while hid_hw_stop() has already freed the input device drvdata->pen_input points at, so when the timer fires ~100 ms later uclogic_inrange_timeout() dereferences freed memory -- a use-after-free in timer-softirq context. Swapping the two calls is not a fix: stopping the device first frees drvdata->pen_input via hidinput_disconnect() while the timer may still be pending, so a timer already armed before removal fires on the freed input device in the window before timer_delete_sync() runs. Use timer_shutdown_sync() before hid_hw_stop() instead. It cancels the timer, waits for a running callback while pen_input is still valid, and prevents any further re-arming -- a later mod_timer() from an in-flight report is silently ignored -- so the timer is provably dead before hid_hw_stop() frees the inputs. This is the ordering the timer core documents for this "timer re-armed from another path" teardown case.

Risk And Classification

EPSS: 0.001770000 probability, percentile 0.073020000 (date 2026-09-07)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 01309e29eb95c16bd48984f2589fad0cbf5e27d1 f40243358b407aec362fe305fabfcdc94a3abd89 git Not specified
CNA Linux Linux affected 01309e29eb95c16bd48984f2589fad0cbf5e27d1 dc5108f18f58870a8dd4203a02a47e571a2be7f0 git Not specified
CNA Linux Linux affected 01309e29eb95c16bd48984f2589fad0cbf5e27d1 9d77ac82e57ead056cf3f71d347083ed9244ad90 git Not specified
CNA Linux Linux affected 01309e29eb95c16bd48984f2589fad0cbf5e27d1 e750cdb6de009aace3c77f37fe2173f96175e8e4 git Not specified
CNA Linux Linux affected 01309e29eb95c16bd48984f2589fad0cbf5e27d1 849e537160bbb77fe419ecc3944bfe125dcd441b git Not specified
CNA Linux Linux affected 01309e29eb95c16bd48984f2589fad0cbf5e27d1 f1b3ca06380531f49f988f4721d3ed30b0d7a5d2 git Not specified
CNA Linux Linux affected 01309e29eb95c16bd48984f2589fad0cbf5e27d1 f13d0a00204b05e62336da0ab72ea0d87b56690c git Not specified
CNA Linux Linux affected 01309e29eb95c16bd48984f2589fad0cbf5e27d1 506fd50a9027340f0e9dcc587d10ccb03312dba6 git Not specified
CNA Linux Linux affected 5.1 Not specified
CNA Linux Linux unaffected 5.1 semver Not specified
CNA Linux Linux unaffected 5.15.220 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.187 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.156 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.108 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.47 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.11 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2.1 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/e750cdb6de009aace3c77f37fe2173f96175e8e4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9d77ac82e57ead056cf3f71d347083ed9244ad90 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/506fd50a9027340f0e9dcc587d10ccb03312dba6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f40243358b407aec362fe305fabfcdc94a3abd89 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/dc5108f18f58870a8dd4203a02a47e571a2be7f0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f1b3ca06380531f49f988f4721d3ed30b0d7a5d2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/849e537160bbb77fe419ecc3944bfe125dcd441b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f13d0a00204b05e62336da0ab72ea0d87b56690c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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