In the Linux kernel, the following vulnerability has been resolved: can: j1939: make j1939_session_activate() fail if device is no longer registered… (CVE-2025-71182)
A vulnerability in the Linux kernel's CAN J1939 subsystem was resolved by ensuring j1939_session_activate() fails if the device is no longer registered. The issue involved a race condition where j1939_session_activate() could succeed after j1939_cancel_active_session() completed, potentially causing resource usage issues. This vulnerability is part of a broader set of Linux kernel security fixes addressing multiple subsystems. The vulnerability has a medium severity score and affects certain Linux kernel versions prior to specific 5.15.x releases. A patch is available and included in updated Linux kernel packages distributed by Ubuntu.
AI Analysis
Technical Summary
The vulnerability in the Linux kernel CAN J1939 subsystem was due to a race condition where j1939_session_activate() could succeed even after the active session was canceled during device unregistration. This was caused by missing checks of the device registration state while holding the session list lock, allowing the function to proceed incorrectly. The fix involves making j1939_session_activate() fail if the device is no longer registered, closing the race window. This issue was reported by syzbot and fixed in Linux kernel versions released after 5.15.0-1103.110~20.04.1 and related versions. The vulnerability is part of a larger set of security issues fixed in the Linux kernel, including multiple subsystems and drivers. The Ubuntu security advisory USN-8096-1 and USN-8096-2 provide detailed patch information and instructions.
Potential Impact
The vulnerability can cause denial of service conditions due to improper handling of device sessions in the CAN J1939 subsystem. The CVSS score of 5.5 (medium) reflects limited impact with no confidentiality or integrity loss but with potential availability impact. There are no known exploits in the wild. The issue affects local attackers with some privileges (low privileges required) and requires local access. The broader Linux kernel security updates also address other vulnerabilities that could lead to privilege escalation, information disclosure, or container escapes, but this specific CVE does not have those impacts.
Mitigation Recommendations
A patch is available and should be applied by updating the Linux kernel to the fixed versions provided by the vendor. Ubuntu users should upgrade to the specified kernel package versions (e.g., 5.15.0-1103.110 and later) as detailed in the Ubuntu security notices USN-8096-1 and USN-8096-2. After updating, a system reboot is required to apply the fixes. Due to ABI changes, recompilation and reinstallation of third-party kernel modules may be necessary. No additional mitigation actions are required beyond applying the official updates.
In the Linux kernel, the following vulnerability has been resolved: can: j1939: make j1939_session_activate() fail if device is no longer registered… (CVE-2025-71182)
Description
A vulnerability in the Linux kernel's CAN J1939 subsystem was resolved by ensuring j1939_session_activate() fails if the device is no longer registered. The issue involved a race condition where j1939_session_activate() could succeed after j1939_cancel_active_session() completed, potentially causing resource usage issues. This vulnerability is part of a broader set of Linux kernel security fixes addressing multiple subsystems. The vulnerability has a medium severity score and affects certain Linux kernel versions prior to specific 5.15.x releases. A patch is available and included in updated Linux kernel packages distributed by Ubuntu.
CVSS v3.1
Score 5.5medium
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
The vulnerability in the Linux kernel CAN J1939 subsystem was due to a race condition where j1939_session_activate() could succeed even after the active session was canceled during device unregistration. This was caused by missing checks of the device registration state while holding the session list lock, allowing the function to proceed incorrectly. The fix involves making j1939_session_activate() fail if the device is no longer registered, closing the race window. This issue was reported by syzbot and fixed in Linux kernel versions released after 5.15.0-1103.110~20.04.1 and related versions. The vulnerability is part of a larger set of security issues fixed in the Linux kernel, including multiple subsystems and drivers. The Ubuntu security advisory USN-8096-1 and USN-8096-2 provide detailed patch information and instructions.
Potential Impact
The vulnerability can cause denial of service conditions due to improper handling of device sessions in the CAN J1939 subsystem. The CVSS score of 5.5 (medium) reflects limited impact with no confidentiality or integrity loss but with potential availability impact. There are no known exploits in the wild. The issue affects local attackers with some privileges (low privileges required) and requires local access. The broader Linux kernel security updates also address other vulnerabilities that could lead to privilege escalation, information disclosure, or container escapes, but this specific CVE does not have those impacts.
Mitigation Recommendations
A patch is available and should be applied by updating the Linux kernel to the fixed versions provided by the vendor. Ubuntu users should upgrade to the specified kernel package versions (e.g., 5.15.0-1103.110 and later) as detailed in the Ubuntu security notices USN-8096-1 and USN-8096-2. After updating, a system reboot is required to apply the fixes. Due to ABI changes, recompilation and reinstallation of third-party kernel modules may be necessary. No additional mitigation actions are required beyond applying the official updates.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2025-71182
- 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
- 3.1
Threat ID: 6a5b63b12d1edb114c8b9014
Added to database: 07/18/2026, 11:29:53 UTC
Last enriched: 08/22/2026, 22:03:59 UTC
Last updated: 09/10/2026, 19:24:57 UTC
Views: 7
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