Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: net: can: j1939: j1939_xtp_rx_rts_session_active(): deactivate session upon… (CVE-2026-22997)
A vulnerability in the Linux kernel's CAN J1939 network layer was resolved, specifically in the j1939_xtp_rx_rts_session_active() function. The issue involves improper session deactivation when receiving a second RTS, leading to a reference count leak that can cause the network device to hang during unregistering. This flaw has been fixed in updated Linux kernel packages for Ubuntu 20.04 LTS and 22.04 LTS. The vulnerability has a CVSS score of 7.5 with a medium severity rating and does not impact confidentiality or integrity but affects availability.
AI Analysis
Technical Summary
The Linux kernel vulnerability CVE-2026-22997 affects the CAN J1939 protocol implementation. The function j1939_xtp_rx_rts_session_active() failed to properly deactivate a session upon receiving a second RTS message if the session timer was cancelled, causing a reference count leak for the j1939_session object. This leak manifests as a 'waiting for vcan0 to become free' message with a usage count stuck at 2, preventing proper network device unregistration. The issue was fixed by ensuring j1939_session_deactivate_activate_next() is called when the timer is cancelled, preventing the resource leak. This fix is included in updated Linux kernel packages for Ubuntu 20.04 LTS and 22.04 LTS, among others.
Potential Impact
The vulnerability causes a resource leak that leads to denial of service by preventing the network device from being properly unregistered, impacting system availability. There is no impact on confidentiality or integrity. No known exploits are reported in the wild.
Mitigation Recommendations
A patch is available and should be applied by updating to the fixed Linux kernel versions provided by Ubuntu for the 20.04 LTS and 22.04 LTS releases. After updating, a system reboot is required. Due to an ABI change, recompilation and reinstallation of third-party kernel modules may be necessary. Follow the vendor's update instructions as detailed in the Ubuntu security notices USN-8162-1 and USN-8180-1.
Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: net: can: j1939: j1939_xtp_rx_rts_session_active(): deactivate session upon… (CVE-2026-22997)
Description
A vulnerability in the Linux kernel's CAN J1939 network layer was resolved, specifically in the j1939_xtp_rx_rts_session_active() function. The issue involves improper session deactivation when receiving a second RTS, leading to a reference count leak that can cause the network device to hang during unregistering. This flaw has been fixed in updated Linux kernel packages for Ubuntu 20.04 LTS and 22.04 LTS. The vulnerability has a CVSS score of 7.5 with a medium severity rating and does not impact confidentiality or integrity but affects availability.
CVSS v3.1
Score 7.5high
Affected software
pkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=xenialpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]~18.04.2?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email 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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=questingRun on your own infrastructure? 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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel vulnerability CVE-2026-22997 affects the CAN J1939 protocol implementation. The function j1939_xtp_rx_rts_session_active() failed to properly deactivate a session upon receiving a second RTS message if the session timer was cancelled, causing a reference count leak for the j1939_session object. This leak manifests as a 'waiting for vcan0 to become free' message with a usage count stuck at 2, preventing proper network device unregistration. The issue was fixed by ensuring j1939_session_deactivate_activate_next() is called when the timer is cancelled, preventing the resource leak. This fix is included in updated Linux kernel packages for Ubuntu 20.04 LTS and 22.04 LTS, among others.
Potential Impact
The vulnerability causes a resource leak that leads to denial of service by preventing the network device from being properly unregistered, impacting system availability. There is no impact on confidentiality or integrity. No known exploits are reported in the wild.
Mitigation Recommendations
A patch is available and should be applied by updating to the fixed Linux kernel versions provided by Ubuntu for the 20.04 LTS and 22.04 LTS releases. After updating, a system reboot is required. Due to an ABI change, recompilation and reinstallation of third-party kernel modules may be necessary. Follow the vendor's update instructions as detailed in the Ubuntu security notices USN-8162-1 and USN-8180-1.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-22997
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:16.04:LTS","Ubuntu:18.04:LTS","Ubuntu:Pro: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: 6a5b63742d1edb114c8b4ab5
Added to database: 07/18/2026, 11:28:52 UTC
Last enriched: 08/22/2026, 21:47:46 UTC
Last updated: 09/10/2026, 19:24:58 UTC
Views: 7
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