{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-64365", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.783Z", "datePublished": "2026-07-25T08:50:20.039Z", "dateUpdated": "2026-08-17T04:54:13.108Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T04:54:13.108Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: letsketch: fix UAF on inrange_timer at driver unbind\n\nletsketch_driver does not provide a .remove callback, but\nletsketch_probe() arms a per-device timer:\n\n timer_setup(&data->inrange_timer, letsketch_inrange_timeout, 0);\n\nThe timer is re-armed from letsketch_raw_event() with a 100 ms\ntimeout on every pen-in-range report, and its callback dereferences\ndata->input_tablet to deliver a synthetic BTN_TOOL_PEN release.\n\nletsketch_data is allocated with devm_kzalloc(), and its input_dev\nfields are devm-allocated via letsketch_setup_input_tablet(). On\ndevice unbind (USB unplug or rmmod), the HID core runs its default\nteardown and devm cleanup frees both letsketch_data and the input\ndevices. Because no .remove callback exists, nothing drains the\ntimer first: if raw_event armed it within ~100 ms of the unbind,\nthe pending timer fires on freed memory. This is a UAF read of\ndata and of data->input_tablet, followed by input_report_key() /\ninput_sync() into the freed input_dev.\n\nThe same problem can occur on the probe error path: if\nhid_hw_start() enabled I/O on an always-poll-quirk device and then\nfailed, raw_event may have armed the timer before devm releases\ndata.\n\nFix by adding a .remove callback that calls hid_hw_stop() first.\nhid_hw_stop() synchronously kills the URBs that deliver raw_event(),\nso once it returns no path can re-arm the timer. timer_shutdown_sync()\nthen drains any in-flight callback and permanently disables further\nmod_timer() calls. Apply the same timer_shutdown_sync() in the probe\nerror path so the timer is guaranteed not to outlive data." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/hid/hid-letsketch.c" ], "versions": [ { "version": "33a5c2793451770cb6dcf0cc35c76cfd4b045513", "lessThan": "2bb6e7143cf70ed281822d26c1848b2897ac36e9", "status": "affected", "versionType": "git" }, { "version": "33a5c2793451770cb6dcf0cc35c76cfd4b045513", "lessThan": "523db788c0f84612707638e266e8957ca7e3a756", "status": "affected", "versionType": "git" }, { "version": "33a5c2793451770cb6dcf0cc35c76cfd4b045513", "lessThan": "17f5928d7010bc9e002930326b59e60e40c09ee3", "status": "affected", "versionType": "git" }, { "version": "33a5c2793451770cb6dcf0cc35c76cfd4b045513", "lessThan": "3eca1a8165b5e7996e699e9df76cb4645e184d42", "status": "affected", "versionType": "git" }, { "version": "33a5c2793451770cb6dcf0cc35c76cfd4b045513", "lessThan": "df3d8aa1a9392da3de66398e7a03422463806b21", "status": "affected", "versionType": "git" }, { "version": "33a5c2793451770cb6dcf0cc35c76cfd4b045513", "lessThan": "46c8beeccd8ab2c863827254a85ea877654a3534", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/hid/hid-letsketch.c" ], "versions": [ { "version": "5.17", "status": "affected" }, { "version": "0", "lessThan": "5.17", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.96", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.39", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.4", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.1.178" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.12.96" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.18.39" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "7.1.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/2bb6e7143cf70ed281822d26c1848b2897ac36e9" }, { "url": "https://git.kernel.org/stable/c/523db788c0f84612707638e266e8957ca7e3a756" }, { "url": "https://git.kernel.org/stable/c/17f5928d7010bc9e002930326b59e60e40c09ee3" }, { "url": "https://git.kernel.org/stable/c/3eca1a8165b5e7996e699e9df76cb4645e184d42" }, { "url": "https://git.kernel.org/stable/c/df3d8aa1a9392da3de66398e7a03422463806b21" }, { "url": "https://git.kernel.org/stable/c/46c8beeccd8ab2c863827254a85ea877654a3534" } ], "title": "HID: letsketch: fix UAF on inrange_timer at driver unbind", "x_generator": { "engine": "bippy-1.2.0" } } } }