{"id":"CVE-2026-80766","summary":"HID: uclogic: fix use-after-free of inrange_timer on remove","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nHID: uclogic: fix use-after-free of inrange_timer on remove\n\nuclogic_remove() cancels the pen in-range timer and then stops the\ndevice:\n\n\ttimer_delete_sync(&drvdata-\u003einrange_timer);\n\thid_hw_stop(hdev);\n\ntimer_delete_sync() only guarantees the timer is idle at that instant.\nuclogic_raw_event_pen() keeps delivering pen reports until hid_hw_stop()\nstops the transport several lines later, and every report with\npen-\u003einrange == UCLOGIC_PARAMS_PEN_INRANGE_NONE re-arms the timer:\n\n\tmod_timer(&drvdata-\u003einrange_timer, jiffies + msecs_to_jiffies(100));\n\nA report landing between the timer_delete_sync() call and the transport\nteardown in hid_hw_stop() re-arms inrange_timer after it was cancelled.\nuclogic_remove() then returns and the devm drvdata is freed, while\nhid_hw_stop() has already freed the input device drvdata-\u003epen_input\npoints at, so when the timer fires ~100 ms later\nuclogic_inrange_timeout() dereferences freed memory -- a use-after-free\nin timer-softirq context.\n\nSwapping the two calls is not a fix: stopping the device first frees\ndrvdata-\u003epen_input via hidinput_disconnect() while the timer may still\nbe pending, so a timer already armed before removal fires on the freed\ninput device in the window before timer_delete_sync() runs.\n\nUse timer_shutdown_sync() before hid_hw_stop() instead. It cancels the\ntimer, waits for a running callback while pen_input is still valid, and\nprevents any further re-arming -- a later mod_timer() from an in-flight\nreport is silently ignored -- so the timer is provably dead before\nhid_hw_stop() frees the inputs. This is the ordering the timer core\ndocuments for this \"timer re-armed from another path\" teardown case.","modified":"2026-09-06T03:46:58.162789202Z","published":"2026-09-04T15:12:38.520Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80766.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/506fd50a9027340f0e9dcc587d10ccb03312dba6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/849e537160bbb77fe419ecc3944bfe125dcd441b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9d77ac82e57ead056cf3f71d347083ed9244ad90"},{"type":"WEB","url":"https://git.kernel.org/stable/c/dc5108f18f58870a8dd4203a02a47e571a2be7f0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e750cdb6de009aace3c77f37fe2173f96175e8e4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f13d0a00204b05e62336da0ab72ea0d87b56690c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f1b3ca06380531f49f988f4721d3ed30b0d7a5d2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f40243358b407aec362fe305fabfcdc94a3abd89"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80766.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80766"},{"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":"01309e29eb95c16bd48984f2589fad0cbf5e27d1"},{"fixed":"f40243358b407aec362fe305fabfcdc94a3abd89"},{"fixed":"dc5108f18f58870a8dd4203a02a47e571a2be7f0"},{"fixed":"9d77ac82e57ead056cf3f71d347083ed9244ad90"},{"fixed":"e750cdb6de009aace3c77f37fe2173f96175e8e4"},{"fixed":"849e537160bbb77fe419ecc3944bfe125dcd441b"},{"fixed":"f1b3ca06380531f49f988f4721d3ed30b0d7a5d2"},{"fixed":"f13d0a00204b05e62336da0ab72ea0d87b56690c"},{"fixed":"506fd50a9027340f0e9dcc587d10ccb03312dba6"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80766.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.1.0"},{"fixed":"5.15.220"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.187"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.156"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.108"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.47"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.11"}]},{"type":"ECOSYSTEM","events":[{"introduced":"7.2.0"},{"fixed":"7.2.1"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80766.json"}}],"schema_version":"1.9.0"}