CVE-2026-46214

Listener denial of service via accept-queue leak

Published May 28, 2026 · Updated May 28, 2026

Denial of service in affected Linux Kernel releases allows local users to make virtio-vsock listeners reject new connections. In virtio_transport_recv_listen(), sk_acceptq_added() increments sk_ack_backlog before vsock_assign_transport() validates the transport, while failure paths omit the matching decrement. Low-privileged local access and repeated transport-assignment failures are required; after about backlog plus one failures, the listener refuses all new connections.

CVSS severity5.5
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in affected Linux Kernel releases allows local users to make virtio-vsock listeners reject new connections. In virtio_transport_recv_listen(), sk_acceptq_added() increments sk_ack_backlog before vsock_assign_transport() validates the transport, while failure paths omit the matching decrement. Low-privileged local access and repeated transport-assignment failures are required; after about backlog plus one failures, the listener refuses all new connections.

The record

CVE
CVE-2026-46214
Published
May 28, 2026
Updated
May 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 28, 2026CVE publishedPublication date reported by the CVE source.
  2. May 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.5
  2. Affected versionversion=c0cfa2d8a788fcf45df5bf4070ab2474c88d543a <29371f3cc83e2a92265b4768014a30b80234112f
  3. Affected versionversion=c0cfa2d8a788fcf45df5bf4070ab2474c88d543a <52bcb57a4e8a0865a76c587c2451906342ae1b2d
  4. Affected versionversion=c0cfa2d8a788fcf45df5bf4070ab2474c88d543a <65c484726e74013a2ec7ba67a34d87760ae8f390
  5. Affected versionversion=c0cfa2d8a788fcf45df5bf4070ab2474c88d543a <6d3275fc4ed968938e1d556c344798046776668d
  6. Affected versionversion=c0cfa2d8a788fcf45df5bf4070ab2474c88d543a <e9edf9893cf26d060705c910a9b62d8cc96ed56a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.5; version=c0cfa2d8a788fcf45df5bf4070ab2474c88d543a <29371f3cc83e2a92265b4768014a30b80234112f; version=c0cfa2d8a788fcf45df5bf4070ab2474c88d543a <52bcb57a4e8a0865a76c587c2451906342ae1b2d; version=c0cfa2d8a788fcf45df5bf4070ab2474c88d543a <65c484726e74013a2ec7ba67a34d87760ae8f390; version=c0cfa2d8a788fcf45df5bf4070ab2474c88d543a <6d3275fc4ed968938e1d556c344798046776668d; version=c0cfa2d8a788fcf45df5bf4070ab2474c88d543a <e9edf9893cf26d060705c910a9b62d8cc96ed56a

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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