Linux aws: In the Linux kernel, the following vulnerability has been resolved: openvswitch: defer tunnel netdev_put to RCU release ovs_netdev_tunnel_destroy()… (CVE-2026-31678)
In the Linux kernel, the following vulnerability has been resolved: openvswitch: defer tunnel netdev_put to RCU release ovs_netdev_tunnel_destroy() may run after NETDEV_UNREGISTER already detached the device. Dropping the netdev reference in destroy can race with concurrent readers that still observe vport->dev. Do not release vport->dev in ovs_netdev_tunnel_destroy(). Instead, let vport_netdev_free() drop the reference from the RCU callback, matching the non-tunnel destroy path and avoiding additional synchronization under RTNL.
AI Analysis
Technical Summary
CVE-2026-31678 is a vulnerability in the Linux kernel's openvswitch subsystem where the function ovs_netdev_tunnel_destroy() improperly releases a network device reference (netdev_put) after the device may have already been detached (NETDEV_UNREGISTER). This creates a race condition with concurrent readers accessing vport->dev, potentially leading to use-after-free or other memory corruption issues. The fix defers the release of the device reference to an RCU callback in vport_netdev_free(), aligning with the non-tunnel destroy path and avoiding synchronization issues under RTNL. This vulnerability affects linux-aws kernel versions prior to 6.8.0-1061.64~22.04.1, 6.8.0-1062.69~22.04.1, 6.8.0-1063.71~22.04.1, 6.8.0-1064.72~22.04.1, and 6.8.0-136.136~22.04.1. The issue is addressed in updated kernel packages as per Ubuntu security advisories USN-8567-1 and USN-8574-1.
Potential Impact
The vulnerability has a CVSS 3.1 score of 7.8 (high severity) with impact on confidentiality, integrity, and availability (C:H/I:H/A:H). Exploitation could lead to privilege escalation or system compromise due to race conditions causing memory corruption in the kernel networking subsystem. However, there are no known exploits in the wild at this time.
Mitigation Recommendations
A patch is available and included in updated linux-aws kernel packages. Users should apply the latest kernel updates for their Ubuntu 22.04 LTS systems (versions 6.8.0-1061.64~22.04.1 and later) and reboot to ensure the fix is applied. Due to an ABI change, recompilation and reinstallation of third-party kernel modules may be required. Follow vendor instructions in Ubuntu security notices USN-8567-1 and USN-8574-1 for update procedures.
Linux aws: In the Linux kernel, the following vulnerability has been resolved: openvswitch: defer tunnel netdev_put to RCU release ovs_netdev_tunnel_destroy()… (CVE-2026-31678)
Description
In the Linux kernel, the following vulnerability has been resolved: openvswitch: defer tunnel netdev_put to RCU release ovs_netdev_tunnel_destroy() may run after NETDEV_UNREGISTER already detached the device. Dropping the netdev reference in destroy can race with concurrent readers that still observe vport->dev. Do not release vport->dev in ovs_netdev_tunnel_destroy(). Instead, let vport_netdev_free() drop the reference from the RCU callback, matching the non-tunnel destroy path and avoiding additional synchronization under RTNL.
CVSS v3.1
Score 7.8high
Affected software
pkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra-legacy/trustypkg:deb/ubuntu/[email protected]~14.04.1?arch=source&distro=esm-infra-legacy/trustypkg:deb/ubuntu/[email protected]~14.04.1?arch=source&distro=esm-infra-legacy/trustypkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=xenialpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg: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=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=resoluteRun on your own infrastructure? 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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-31678 is a vulnerability in the Linux kernel's openvswitch subsystem where the function ovs_netdev_tunnel_destroy() improperly releases a network device reference (netdev_put) after the device may have already been detached (NETDEV_UNREGISTER). This creates a race condition with concurrent readers accessing vport->dev, potentially leading to use-after-free or other memory corruption issues. The fix defers the release of the device reference to an RCU callback in vport_netdev_free(), aligning with the non-tunnel destroy path and avoiding synchronization issues under RTNL. This vulnerability affects linux-aws kernel versions prior to 6.8.0-1061.64~22.04.1, 6.8.0-1062.69~22.04.1, 6.8.0-1063.71~22.04.1, 6.8.0-1064.72~22.04.1, and 6.8.0-136.136~22.04.1. The issue is addressed in updated kernel packages as per Ubuntu security advisories USN-8567-1 and USN-8574-1.
Potential Impact
The vulnerability has a CVSS 3.1 score of 7.8 (high severity) with impact on confidentiality, integrity, and availability (C:H/I:H/A:H). Exploitation could lead to privilege escalation or system compromise due to race conditions causing memory corruption in the kernel networking subsystem. However, there are no known exploits in the wild at this time.
Mitigation Recommendations
A patch is available and included in updated linux-aws kernel packages. Users should apply the latest kernel updates for their Ubuntu 22.04 LTS systems (versions 6.8.0-1061.64~22.04.1 and later) and reboot to ensure the fix is applied. Due to an ABI change, recompilation and reinstallation of third-party kernel modules may be required. Follow vendor instructions in Ubuntu security notices USN-8567-1 and USN-8574-1 for update procedures.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-31678
- 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","Ubuntu:26.04:LTS"]
- Cvss Version
- 4.0
Threat ID: 6a5b61c02d1edb114c88573f
Added to database: 07/18/2026, 11:21:36 UTC
Last enriched: 08/01/2026, 05:00:05 UTC
Last updated: 09/10/2026, 19:36:53 UTC
Views: 23
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