---
cve: "CVE-2025-68822"
severity: "HIGH"
cvss: 7.8
epss: "13%"
vendor: "Linux"
kev: false
exploited: false
published: "2026-01-13 16:16:04"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-12T11:29:11+02:00"
---

# CVE-2025-68822

> 7.8 HIGH

## Beschreibung

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.

## CVSS-Vektor

```
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Lokal | good |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- Kernel ≥ 6.12.64
- Kernel ≥ 6.18.3

## Referenzen

- <https://git.kernel.org/stable/c/ed8c61b89be0c45f029228b2913d5cf7b5cda1a7>
- <https://git.kernel.org/stable/c/a9c115e017b2c633d25bdfe6709dda6fc36f08c2>
- <https://git.kernel.org/stable/c/bf40644ef8c8a288742fa45580897ed0e0289474>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2025-68822) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_