CVE-2025-68822 (GCVE-0-2025-68822)
Vulnerability from cvelistv5 – Published: 2026-01-13 15:29 – Updated: 2026-08-05 12:11
VLAI
EPSS
VEX
Title
Input: alps - fix use-after-free bugs caused by dev3_register_work
Summary
In the Linux kernel, the following vulnerability has been resolved:
Input: alps - fix use-after-free bugs caused by dev3_register_work
The dev3_register_work delayed work item is initialized within
alps_reconnect() and scheduled upon receipt of the first bare
PS/2 packet from an external PS/2 device connected to the ALPS
touchpad. During device detachment, the original implementation
calls flush_workqueue() in psmouse_disconnect() to ensure
completion of dev3_register_work. However, the flush_workqueue()
in psmouse_disconnect() only blocks and waits for work items that
were already queued to the workqueue prior to its invocation. Any
work items submitted after flush_workqueue() is called are not
included in the set of tasks that the flush operation awaits.
This means that after flush_workqueue() has finished executing,
the dev3_register_work could still be scheduled. Although the
psmouse state is set to PSMOUSE_CMD_MODE in psmouse_disconnect(),
the scheduling of dev3_register_work remains unaffected.
The race condition can occur as follows:
CPU 0 (cleanup path) | CPU 1 (delayed work)
psmouse_disconnect() |
psmouse_set_state() |
flush_workqueue() | alps_report_bare_ps2_packet()
alps_disconnect() | psmouse_queue_work()
kfree(priv); // FREE | alps_register_bare_ps2_mouse()
| priv = container_of(work...); // USE
| priv->dev3 // USE
Add disable_delayed_work_sync() in alps_disconnect() to ensure
that dev3_register_work is properly canceled and prevented from
executing after the alps_data structure has been deallocated.
This bug is identified by static analysis.
Severity
7.8 (High)
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
04aae283ba6a8cd4851d937bf9c6d6ef0361d794 , < ed8c61b89be0c45f029228b2913d5cf7b5cda1a7
(git)
Affected: 04aae283ba6a8cd4851d937bf9c6d6ef0361d794 , < a9c115e017b2c633d25bdfe6709dda6fc36f08c2 (git) Affected: 04aae283ba6a8cd4851d937bf9c6d6ef0361d794 , < bf40644ef8c8a288742fa45580897ed0e0289474 (git) |
guessed | |
| Linux | Linux |
Affected:
4.0
Unaffected: 0 , < 4.0 (semver) Unaffected: 6.12.64 , ≤ 6.12.* (semver) Unaffected: 6.18.3 , ≤ 6.18.* (semver) Unaffected: 6.19 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"cna": {
"affected": [
{
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"product": "Linux",
"programFiles": [
"drivers/input/mouse/alps.c"
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"vendor": "Linux",
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"versionType": "git"
}
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"programFiles": [
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "4.0"
},
{
"lessThan": "4.0",
"status": "unaffected",
"version": "0",
"versionType": "semver"
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{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.64",
"versionType": "semver"
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{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.3",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.19",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.64",
"versionStartIncluding": "4.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.3",
"versionStartIncluding": "4.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.19",
"versionStartIncluding": "4.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"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-\u003edev3 // 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."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"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\u0027s 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\u0027s 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": {
"dateUpdated": "2026-08-05T12:11:48.046Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/ed8c61b89be0c45f029228b2913d5cf7b5cda1a7"
},
{
"url": "https://git.kernel.org/stable/c/a9c115e017b2c633d25bdfe6709dda6fc36f08c2"
},
{
"url": "https://git.kernel.org/stable/c/bf40644ef8c8a288742fa45580897ed0e0289474"
}
],
"title": "Input: alps - fix use-after-free bugs caused by dev3_register_work",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2025-68822",
"datePublished": "2026-01-13T15:29:24.703Z",
"dateReserved": "2025-12-24T10:30:51.048Z",
"dateUpdated": "2026-08-05T12:11:48.046Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2025-68822",
"date": "2026-09-28",
"epss": "0.00145",
"percentile": "0.03136"
},
"microsoft_vex": {
"current_release_date": "2026-09-23T02:50:39.000Z",
"cve": "CVE-2025-68822",
"id": "msrc_CVE-2025-68822",
"initial_release_date": "2026-01-15T01:01:27.000Z",
"product_status:known_affected": "15",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "Input: alps - fix use-after-free bugs caused by dev3_register_work",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2025-68822.json",
"version": "17"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/input/mouse/alps.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
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"status": "affected",
"version": "04aae283ba6a8cd4851d937bf9c6d6ef0361d794",
"versionType": "git"
},
{
"lessThan": "a9c115e017b2c633d25bdfe6709dda6fc36f08c2",
"status": "affected",
"version": "04aae283ba6a8cd4851d937bf9c6d6ef0361d794",
"versionType": "git"
},
{
"lessThan": "bf40644ef8c8a288742fa45580897ed0e0289474",
"status": "affected",
"version": "04aae283ba6a8cd4851d937bf9c6d6ef0361d794",
"versionType": "git"
}
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"product": "Linux",
"programFiles": [
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],
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"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "4.0"
},
{
"lessThan": "4.0",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.64",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.3",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.19",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"cveTags": [],
"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-\u003edev3 // 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."
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nEntrada: alps - corrige errores de uso despu\u00e9s de liberaci\u00f3n causados por dev3_register_work\n\nEl elemento de trabajo retrasado dev3_register_work se inicializa dentro de alps_reconnect() y se programa al recibir el primer paquete PS/2 \u0027bare\u0027 de un dispositivo PS/2 externo conectado al touchpad ALPS. Durante la desconexi\u00f3n del dispositivo, la implementaci\u00f3n original llama a flush_workqueue() en psmouse_disconnect() para asegurar la finalizaci\u00f3n de dev3_register_work. Sin embargo, la flush_workqueue() en psmouse_disconnect() solo bloquea y espera por elementos de trabajo que ya estaban en cola en la workqueue antes de su invocaci\u00f3n. Cualquier elemento de trabajo enviado despu\u00e9s de que se llama a flush_workqueue() no se incluye en el conjunto de tareas que la operaci\u00f3n de \u0027flush\u0027 espera. Esto significa que despu\u00e9s de que flush_workqueue() ha terminado de ejecutarse, el dev3_register_work a\u00fan podr\u00eda programarse. Aunque el estado de psmouse se establece en PSMOUSE_CMD_MODE en psmouse_disconnect(), la programaci\u00f3n de dev3_register_work permanece inalterada.\n\nLa condici\u00f3n de carrera puede ocurrir de la siguiente manera:\n\nCPU 0 (ruta de limpieza) | CPU 1 (trabajo retrasado)\npsmouse_disconnect() |\n psmouse_set_state() |\n flush_workqueue() | alps_report_bare_ps2_packet()\n alps_disconnect() | psmouse_queue_work()\n kfree(priv); // LIBERAR | alps_register_bare_ps2_mouse()\n | priv = container_of(work...); // USAR\n | priv-\u0026gt;dev3 // USAR\n\nA\u00f1adir disable_delayed_work_sync() en alps_disconnect() para asegurar que dev3_register_work se cancele correctamente y se impida su ejecuci\u00f3n despu\u00e9s de que la estructura alps_data haya sido desasignada.\n\nEste error es identificado por an\u00e1lisis est\u00e1tico."
}
],
"id": "CVE-2025-68822",
"lastModified": "2026-07-30T06:24:47.683",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 5.9,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
]
},
"published": "2026-01-13T16:16:04.550",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/a9c115e017b2c633d25bdfe6709dda6fc36f08c2"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/bf40644ef8c8a288742fa45580897ed0e0289474"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/ed8c61b89be0c45f029228b2913d5cf7b5cda1a7"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Deferred"
}
},
"redhat_vex": {
"aggregate_severity": "Low",
"current_release_date": "2026-08-21T20:47:04+00:00",
"cve": "CVE-2025-68822",
"id": "CVE-2025-68822",
"initial_release_date": "2025-01-01T00:00:00+00:00",
"product_status:known_affected": "232",
"product_status:known_not_affected": "42",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: Input: alps - fix use-after-free bugs caused by dev3_register_work",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68822.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-08-28T16:48:45Z",
"cve": "CVE-2025-68822",
"id": "CVE-2025-68822",
"initial_release_date": "2026-01-15T00:25:39Z",
"product_status:first_fixed": "2",
"product_status:known_affected": "702",
"product_status:known_not_affected": "9",
"product_status:recommended": "316",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2025-68822",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-68822.json",
"version": "24"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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