openvswitch: defer tunnel netdev_put to RCU release

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Summary

CVECVE-2026-31678
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-25 09:16:01 UTC
Updated2026-05-06 21:28:02 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.000240000 probability, percentile 0.067850000 (date 2026-04-27)

Problem Types: CWE-367

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected a9020fde67a6eb77f8130feff633189f99264db1 9d56aced21fb9c104e8a3f3be9b21fbafe448ffc git Not specified
CNA Linux Linux affected a9020fde67a6eb77f8130feff633189f99264db1 42f0d3d81209654c08ffdde5a34b9b92d2645896 git Not specified
CNA Linux Linux affected a9020fde67a6eb77f8130feff633189f99264db1 bbe7bd722bfaea36aab3da6cc60fb4a05c644643 git Not specified
CNA Linux Linux affected a9020fde67a6eb77f8130feff633189f99264db1 98b726ab5e2a4811e27c28e4d041f75bba147eab git Not specified
CNA Linux Linux affected a9020fde67a6eb77f8130feff633189f99264db1 b8c56a3fc5d879c0928f207a756b0f067f06c6a8 git Not specified
CNA Linux Linux affected a9020fde67a6eb77f8130feff633189f99264db1 6931d21f87bc6d657f145798fad0bf077b82486c git Not specified
CNA Linux Linux affected 4.3 Not specified
CNA Linux Linux unaffected 4.3 semver Not specified
CNA Linux Linux unaffected 6.1.168 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.131 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.80 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.21 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.11 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/bbe7bd722bfaea36aab3da6cc60fb4a05c644643 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/42f0d3d81209654c08ffdde5a34b9b92d2645896 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/b8c56a3fc5d879c0928f207a756b0f067f06c6a8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/98b726ab5e2a4811e27c28e4d041f75bba147eab 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/9d56aced21fb9c104e8a3f3be9b21fbafe448ffc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/6931d21f87bc6d657f145798fad0bf077b82486c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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