In the Linux kernel, the following vulnerability has been resolved: Input: lkkbd - disable pending work before freeing device lkkbd_interrupt()… (CVE-2025-71073)
A use-after-free vulnerability in the Linux kernel's lkkbd input device driver was resolved. The issue arises because the work handler lkkbd_reinit() can run after the lkkbd structure has been freed, due to improper disabling of pending work before freeing the device. This can lead to potential memory corruption. The vulnerability has a high severity with a CVSS score of 7.8. Fixes have been released and are available in updated Linux kernel versions.
AI Analysis
Technical Summary
CVE-2025-71073 is a use-after-free vulnerability in the Linux kernel's lkkbd input device driver. The lkkbd_interrupt() function schedules work via schedule_work(), and the work handler lkkbd_reinit() dereferences the lkkbd structure and its serio/input_dev fields. However, lkkbd_disconnect() and error paths in lkkbd_connect() free the lkkbd structure without properly preventing the reinit work from being re-queued until serio_close() returns. This allows the work handler to run after the structure has been freed, causing a use-after-free condition. The fix involves using disable_work_sync() instead of cancel_work_sync() to ensure the reinit work cannot be re-queued, applied in both lkkbd_disconnect() and lkkbd_connect() error paths.
Potential Impact
This vulnerability can lead to use-after-free conditions in the Linux kernel's input device driver, potentially allowing an attacker with local privileges to cause memory corruption. The CVSS score of 7.8 indicates high impact on confidentiality, integrity, and availability. Exploitation could compromise system stability or security.
Mitigation Recommendations
A patch is available and should be applied by updating to the fixed Linux kernel versions. The Ubuntu security advisories USN-8177-1 and USN-8177-2 provide updated kernel packages that address this and other vulnerabilities. After applying the update, a system reboot is required. Due to an ABI change, third-party kernel modules must be recompiled and reinstalled. No additional mitigation is required beyond applying the official fix.
In the Linux kernel, the following vulnerability has been resolved: Input: lkkbd - disable pending work before freeing device lkkbd_interrupt()… (CVE-2025-71073)
Description
A use-after-free vulnerability in the Linux kernel's lkkbd input device driver was resolved. The issue arises because the work handler lkkbd_reinit() can run after the lkkbd structure has been freed, due to improper disabling of pending work before freeing the device. This can lead to potential memory corruption. The vulnerability has a high severity with a CVSS score of 7.8. Fixes have been released and are available in updated Linux kernel versions.
CVSS v3.1
Score 7.8high
Affected software
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protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingRun on your own infrastructure? 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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2025-71073 is a use-after-free vulnerability in the Linux kernel's lkkbd input device driver. The lkkbd_interrupt() function schedules work via schedule_work(), and the work handler lkkbd_reinit() dereferences the lkkbd structure and its serio/input_dev fields. However, lkkbd_disconnect() and error paths in lkkbd_connect() free the lkkbd structure without properly preventing the reinit work from being re-queued until serio_close() returns. This allows the work handler to run after the structure has been freed, causing a use-after-free condition. The fix involves using disable_work_sync() instead of cancel_work_sync() to ensure the reinit work cannot be re-queued, applied in both lkkbd_disconnect() and lkkbd_connect() error paths.
Potential Impact
This vulnerability can lead to use-after-free conditions in the Linux kernel's input device driver, potentially allowing an attacker with local privileges to cause memory corruption. The CVSS score of 7.8 indicates high impact on confidentiality, integrity, and availability. Exploitation could compromise system stability or security.
Mitigation Recommendations
A patch is available and should be applied by updating to the fixed Linux kernel versions. The Ubuntu security advisories USN-8177-1 and USN-8177-2 provide updated kernel packages that address this and other vulnerabilities. After applying the update, a system reboot is required. Due to an ABI change, third-party kernel modules must be recompiled and reinstalled. No additional mitigation is required beyond applying the official fix.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2025-71073
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:16.04:LTS","Ubuntu:Pro:FIPS:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:18.04:LTS","Ubuntu:Pro:FIPS-updates:18.04:LTS","Ubuntu:Pro:FIPS:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:20.04:LTS","Ubuntu:Pro:FIPS-updates:20.04:LTS","Ubuntu:Pro:FIPS:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:Nvidia-BlueField:22.04:LTS","Ubuntu:Pro:FIPS-preview:22.04:LTS","Ubuntu:Pro:FIPS-updates:22.04:LTS","Ubuntu:Pro:Realtime:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:Nvidia-BlueField:24.04:LTS","Ubuntu:Pro:FIPS-updates:24.04:LTS","Ubuntu:Pro:Realtime:24.04:LTS","Ubuntu:25.10"]
- Cvss Version
- 4.0
Threat ID: 6a5b63ed2d1edb114c8d03a6
Added to database: 07/18/2026, 11:30:53 UTC
Last enriched: 08/19/2026, 07:53:31 UTC
Last updated: 09/10/2026, 19:24:57 UTC
Views: 14
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