{"id":"CVE-2025-68822","state":"PUBLISHED","title":"Input: alps - fix use-after-free bugs caused by dev3_register_work","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nInput: alps - fix use-after-free bugs caused by dev3_register_work\n\nThe dev3_register_work delayed work item is initialized within\nalps_reconnect() and scheduled upon receipt of the first bare\nPS/2 packet from an external PS/2 device connected to the ALPS\ntouchpad. During device detachment, the original implementation\ncalls flush_workqueue() in psmouse_disconnect() to ensure\ncompletion of dev3_register_work. However, the flush_workqueue()\nin psmouse_disconnect() only blocks and waits for work items that\nwere already queued to the workqueue prior to its invocation. Any\nwork items submitted after flush_workqueue() is called are not\nincluded in the set of tasks that the flush operation awaits.\nThis means that after flush_workqueue() has finished executing,\nthe dev3_register_work could still be scheduled. Although the\npsmouse state is set to PSMOUSE_CMD_MODE in psmouse_disconnect(),\nthe scheduling of dev3_register_work remains unaffected.\n\nThe race condition can occur as follows:\n\nCPU 0 (cleanup path)     | CPU 1 (delayed work)\npsmouse_disconnect()     |\n  psmouse_set_state()    |\n  flush_workqueue()      | alps_report_bare_ps2_packet()\n  alps_disconnect()      |   psmouse_queue_work()\n    kfree(priv); // FREE | alps_register_bare_ps2_mouse()\n                         |   priv = container_of(work...); // USE\n                         |   priv->dev3 // USE\n\nAdd disable_delayed_work_sync() in alps_disconnect() to ensure\nthat dev3_register_work is properly canceled and prevented from\nexecuting after the alps_data structure has been deallocated.\n\nThis bug is identified by static analysis.","publishedAt":"2026-01-13T15:29:24.703Z","updatedAt":"2026-10-30T12:23:21.175Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"04aae283ba6a8cd4851d937bf9c6d6ef0361d794","status":"affected","lessThan":"55beb00222af2eee967322670a0c8f3c6426becb","versionType":"git"},{"version":"04aae283ba6a8cd4851d937bf9c6d6ef0361d794","status":"affected","lessThan":"b9d8cfd6d77f5072a4df10646810d128220457fb","versionType":"git"},{"version":"04aae283ba6a8cd4851d937bf9c6d6ef0361d794","status":"affected","lessThan":"ed8c61b89be0c45f029228b2913d5cf7b5cda1a7","versionType":"git"},{"version":"04aae283ba6a8cd4851d937bf9c6d6ef0361d794","status":"affected","lessThan":"a9c115e017b2c633d25bdfe6709dda6fc36f08c2","versionType":"git"},{"version":"04aae283ba6a8cd4851d937bf9c6d6ef0361d794","status":"affected","lessThan":"bf40644ef8c8a288742fa45580897ed0e0289474","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/input/mouse/alps.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.0","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.64","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.3","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/input/mouse/alps.c"]}],"references":["https://git.kernel.org/stable/c/55beb00222af2eee967322670a0c8f3c6426becb","https://git.kernel.org/stable/c/b9d8cfd6d77f5072a4df10646810d128220457fb","https://git.kernel.org/stable/c/ed8c61b89be0c45f029228b2913d5cf7b5cda1a7","https://git.kernel.org/stable/c/a9c115e017b2c633d25bdfe6709dda6fc36f08c2","https://git.kernel.org/stable/c/bf40644ef8c8a288742fa45580897ed0e0289474"],"weaknesses":["CWE-416"],"ingestedAt":"2026-10-30T12:40:04.423Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/68xxx/CVE-2025-68822.json","commit":"db8103c5921aac81d5d90efcf3745980dafabf49","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-68822","state":"PUBLISHED","datePublished":"2026-01-13T15:29:24.703Z","dateUpdated":"2026-10-30T12:23:21.175Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-12-24T10:30:51.048Z"},"containers":{"cna":{"title":"Input: alps - fix use-after-free bugs caused by dev3_register_work","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nInput: alps - fix use-after-free bugs caused by dev3_register_work\n\nThe dev3_register_work delayed work item is initialized within\nalps_reconnect() and scheduled upon receipt of the first bare\nPS/2 packet from an external PS/2 device connected to the ALPS\ntouchpad. During device detachment, the original implementation\ncalls flush_workqueue() in psmouse_disconnect() to ensure\ncompletion of dev3_register_work. However, the flush_workqueue()\nin psmouse_disconnect() only blocks and waits for work items that\nwere already queued to the workqueue prior to its invocation. Any\nwork items submitted after flush_workqueue() is called are not\nincluded in the set of tasks that the flush operation awaits.\nThis means that after flush_workqueue() has finished executing,\nthe dev3_register_work could still be scheduled. Although the\npsmouse state is set to PSMOUSE_CMD_MODE in psmouse_disconnect(),\nthe scheduling of dev3_register_work remains unaffected.\n\nThe race condition can occur as follows:\n\nCPU 0 (cleanup path)     | CPU 1 (delayed work)\npsmouse_disconnect()     |\n  psmouse_set_state()    |\n  flush_workqueue()      | alps_report_bare_ps2_packet()\n  alps_disconnect()      |   psmouse_queue_work()\n    kfree(priv); // FREE | alps_register_bare_ps2_mouse()\n                         |   priv = container_of(work...); // USE\n                         |   priv->dev3 // USE\n\nAdd disable_delayed_work_sync() in alps_disconnect() to ensure\nthat dev3_register_work is properly canceled and prevented from\nexecuting after the alps_data structure has been deallocated.\n\nThis bug is identified by static analysis."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"04aae283ba6a8cd4851d937bf9c6d6ef0361d794","status":"affected","lessThan":"55beb00222af2eee967322670a0c8f3c6426becb","versionType":"git"},{"version":"04aae283ba6a8cd4851d937bf9c6d6ef0361d794","status":"affected","lessThan":"b9d8cfd6d77f5072a4df10646810d128220457fb","versionType":"git"},{"version":"04aae283ba6a8cd4851d937bf9c6d6ef0361d794","status":"affected","lessThan":"ed8c61b89be0c45f029228b2913d5cf7b5cda1a7","versionType":"git"},{"version":"04aae283ba6a8cd4851d937bf9c6d6ef0361d794","status":"affected","lessThan":"a9c115e017b2c633d25bdfe6709dda6fc36f08c2","versionType":"git"},{"version":"04aae283ba6a8cd4851d937bf9c6d6ef0361d794","status":"affected","lessThan":"bf40644ef8c8a288742fa45580897ed0e0289474","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/input/mouse/alps.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.0","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.64","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.3","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/input/mouse/alps.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/55beb00222af2eee967322670a0c8f3c6426becb"},{"url":"https://git.kernel.org/stable/c/b9d8cfd6d77f5072a4df10646810d128220457fb"},{"url":"https://git.kernel.org/stable/c/ed8c61b89be0c45f029228b2913d5cf7b5cda1a7"},{"url":"https://git.kernel.org/stable/c/a9c115e017b2c633d25bdfe6709dda6fc36f08c2"},{"url":"https://git.kernel.org/stable/c/bf40644ef8c8a288742fa45580897ed0e0289474"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The SERIO_8042 byte stream is locally reachable through the userio serio-emulation device, leading through serio_interrupt(), ps2_interrupt(), and alps_process_byte() to the vulnerable path. In a reasonable deployment granting an input-testing account access to /dev/userio, direct physical access is unnecessary.\nAC:L - The attacker can provoke reconnect failure and concurrently inject the first bare PS/2 packet during disconnect, controlling both sides of the race and allowing repeated attempts. No condition inherently outside the attacker's control is required.\nPR:L - The userio command path contains no capability check; a basic local account with device-file access can emulate a SERIO_8042 ALPS device, inject packets, and provoke teardown. Init-namespace root is not intrinsically required.\nUI:N - The attacker can drive device emulation, reconnect failure, packet delivery, and the resulting race without any victim action.\nS:U - The vulnerable worker and resulting corruption execute within the host kernel's existing security authority; ordinary kernel privilege escalation does not cross a separate security scope.\nC:H - The worker dereferences attacker-reclaimable alps_data, psmouse, and serio objects after free. Reclaiming the embedded pending work object can provide controlled kernel-pointer dereferences and ultimately arbitrary kernel-memory disclosure.\nI:H - The stale worker writes an input-device pointer and physical-path string into freed memory, while the embedded work_struct and its function pointer are themselves reclaimable. This supports heap corruption, arbitrary writes, and control-flow hijacking.\nA:H - Executing a delayed work item from freed storage can immediately cause invalid pointer dereferences, corrupted workqueue state, an oops, or a kernel panic, and the trigger can be retried."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:23:21.175Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.0","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.0","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.0","versionEndExcluding":"6.12.64"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.0","versionEndExcluding":"6.18.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.0","versionEndExcluding":"6.19"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2025-68822","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:05:36.678846Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-416","lang":"en","type":"CWE","description":"CWE-416 Use After Free"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T18:15:10.477Z"}}]}}}