Linux Kernel up to 6.12.63/6.18.2/6.19-rc1 lkkbd_interrupt use after free

CVSS Meta Temp Score
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CTI Interest Score
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7.7$0-$5k0.00

Summaryinfo

A vulnerability identified as critical has been detected in Linux Kernel up to 6.12.63/6.18.2/6.19-rc1. This impacts the function lkkbd_interrupt. This manipulation causes use after free. This vulnerability is tracked as CVE-2025-71073. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.12.63/6.18.2/6.19-rc1. It has been declared as critical. Affected by this vulnerability is the function lkkbd_interrupt. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: Input: lkkbd - disable pending work before freeing device lkkbd_interrupt() schedules lk->tq via schedule_work(), and the work handler lkkbd_reinit() dereferences the lkkbd structure and its serio/input_dev fields. lkkbd_disconnect() and error paths in lkkbd_connect() free the lkkbd structure without preventing the reinit work from being queued again until serio_close() returns. This can allow the work handler to run after the structure has been freed, leading to a potential use-after-free. Use disable_work_sync() instead of cancel_work_sync() to ensure the reinit work cannot be re-queued, and call it both in lkkbd_disconnect() and in lkkbd_connect() error paths after serio_open().

The advisory is shared at git.kernel.org. This vulnerability is known as CVE-2025-71073 since 01/13/2026. The exploitation appears to be easy. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 06/21/2026).

The vulnerability scanner Nessus provides a plugin with the ID 307549 (Ubuntu 24.04 LTS / 25.10 : Linux kernel (GCP) vulnerabilities (USN-8183-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.12.64, 6.18.3 or 6.19-rc2 eliminates this vulnerability. Applying the patch 3a7cd1397c209076c371d53bf39a55c138f62342/cffc4e29b1e2d44ab094cf142d7c461ff09b9104/e58c88f0cb2d8ed89de78f6f17409d29cfab6c5c is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (307549) and CERT Bund (WID-SEC-2026-0086). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • IBM QRadar SIEM
  • SUSE openSUSE
  • RESF Rocky Linux
  • Open Source Linux Kernel
  • IBM Power Hardware Management Console

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.9
VulDB Meta Temp Score: 7.7

VulDB Base Score: 8.0
VulDB Temp Score: 7.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 307549
Nessus Name: Ubuntu 24.04 LTS / 25.10 : Linux kernel (GCP) vulnerabilities (USN-8183-1)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.12.64/6.18.3/6.19-rc2
Patch: 3a7cd1397c209076c371d53bf39a55c138f62342/cffc4e29b1e2d44ab094cf142d7c461ff09b9104/e58c88f0cb2d8ed89de78f6f17409d29cfab6c5c

Timelineinfo

01/13/2026 Advisory disclosed
01/13/2026 +0 days CVE reserved
01/13/2026 +0 days VulDB entry created
06/21/2026 +159 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2025-71073 (🔒)
GCVE (CVE): GCVE-0-2025-71073
GCVE (VulDB): GCVE-100-340657
CERT Bund: WID-SEC-2026-0086 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 01/13/2026 17:41
Updated: 06/21/2026 13:58
Changes: 01/13/2026 17:41 (58), 03/25/2026 20:29 (11), 03/31/2026 16:34 (1), 04/21/2026 04:49 (2), 06/21/2026 13:58 (7)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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