Linux Kernel up to 6.19.10 RCU Call ovs_netdev_tunnel_destroy information disclosure

CVSS Meta Temp Score
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CTI Interest Score
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2.5$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.1.167/6.6.130/6.12.79/6.18.20/6.19.10. It has been rated as critical. This issue affects the function ovs_netdev_tunnel_destroy of the component RCU Call Handler. Performing a manipulation results in information disclosure. This vulnerability was named CVE-2026-31678. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.1.167/6.6.130/6.12.79/6.18.20/6.19.10. It has been classified as problematic. This affects the function ovs_netdev_tunnel_destroy of the component RCU Call Handler. The manipulation with an unknown input leads to a information disclosure vulnerability. CWE is classifying the issue as CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. This is going to have an impact on confidentiality. The summary by CVE is:

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.

It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-31678 since 03/09/2026. The exploitability is told to be difficult. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1592 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 310348 (Linux Distros Unpatched Vulnerability : CVE-2026-31678), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.1.168, 6.6.131, 6.12.80, 6.18.21 or 6.19.11 eliminates this vulnerability. Applying the patch 9d56aced21fb9c104e8a3f3be9b21fbafe448ffc/42f0d3d81209654c08ffdde5a34b9b92d2645896/bbe7bd722bfaea36aab3da6cc60fb4a05c644643/98b726ab5e2a4811e27c28e4d041f75bba147eab/b8c56a3fc5d879c0928f207a756b0f067f06c6a8/6931d21f87bc6d657f145798fad0bf077b82486c 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 (310348) and EUVD (EUVD-2026-25645). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 2.6
VulDB Meta Temp Score: 2.5

VulDB Base Score: 2.6
VulDB Temp Score: 2.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Class: Information disclosure
CWE: CWE-200 / CWE-284 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 310348
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-31678

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.1.168/6.6.131/6.12.80/6.18.21/6.19.11
Patch: 9d56aced21fb9c104e8a3f3be9b21fbafe448ffc/42f0d3d81209654c08ffdde5a34b9b92d2645896/bbe7bd722bfaea36aab3da6cc60fb4a05c644643/98b726ab5e2a4811e27c28e4d041f75bba147eab/b8c56a3fc5d879c0928f207a756b0f067f06c6a8/6931d21f87bc6d657f145798fad0bf077b82486c

Timelineinfo

03/09/2026 CVE reserved
04/25/2026 +46 days Advisory disclosed
04/25/2026 +0 days VulDB entry created
04/26/2026 +1 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-31678 (🔒)
GCVE (CVE): GCVE-0-2026-31678
GCVE (VulDB): GCVE-100-359583
EUVD: 🔒

Entryinfo

Created: 04/25/2026 11:33
Updated: 04/26/2026 05:51
Changes: 04/25/2026 11:33 (59), 04/25/2026 13:02 (1), 04/26/2026 05:51 (2)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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