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  4. CVE 2026 31678 openvswitch defer tunnel netdevput to rcu release
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Back to active CVEs
High · CVSS 7.8CVE-2026-31678

openvswitch: defer tunnel netdev_put to RCU releaseCVE-2026-31678

Answer in brief

CVE-2026-31678 records a High severity (CVSS 7.8) vulnerability in openvswitch: defer tunnel netdev_put to RCU release. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Apr 25, 2026Updated Oct 16, 2026Source checked Oct 16, 2026First seen by HOL Oct 16, 2026Material review Oct 16, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.8
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Linux/Linuxgeneric>=a9020fde67a6eb77f8130feff633189f99264db1 <9d56aced21fb9c104e8a3f3be9b21fbafe448ffc || >=a9020fde67a6eb77f8130feff633189f99264db1 <42f0d3d81209654c08ffdde5a34b9b92d2645896 || >=a9020fde67a6eb77f8130feff633189f99264db1 <bbe7bd722bfaea36aab3da6cc60fb4a05c644643 || >=a9020fde67a6eb77f8130feff633189f99264db1 <98b726ab5e2a4811e27c28e4d041f75bba147eab || >=a9020fde67a6eb77f8130feff633189f99264db1 <b8c56a3fc5d879c0928f207a756b0f067f06c6a8 || >=a9020fde67a6eb77f8130feff633189f99264db1 <6931d21f87bc6d657f145798fad0bf077b82486c9d56aced21fb9c104e8a3f3be9b21fbafe448ffc, 42f0d3d81209654c08ffdde5a34b9b92d2645896, bbe7bd722bfaea36aab3da6cc60fb4a05c644643, 98b726ab5e2a4811e27c28e4d041f75bba147eab, b8c56a3fc5d879c0928f207a756b0f067f06c6a8, 6931d21f87bc6d657f145798fad0bf077b82486c
Linux/Linuxgeneric4.3Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
  2. 2Review the reported fix. Update Linux/Linux to 9d56aced21fb9c104e8a3f3be9b21fbafe448ffc if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Apr 25, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 16, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 16, 2026

Sources and claim methodology

  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

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Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
Not reported
Source
CVE List V5
Source checked
Oct 16, 2026
References
6 linked sources
Open source record