CVE-2026-46214

MediumCVSS 5.5/10Last modified Nov 6, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

vsock/virtio: fix accept queue count leak on transport mismatch

virtio_transport_recv_listen() calls sk_acceptq_added() before vsock_assign_transport(). If vsock_assign_transport() fails or selects a different transport, the error path returns without calling sk_acceptq_removed(), permanently incrementing sk_ack_backlog.

After approximately backlog+1 such failures, sk_acceptq_is_full() returns true, causing the listener to reject all new connections.

Fix by moving sk_acceptq_added() to after the transport validation, matching the pattern used by vmci_transport and hyperv_transport.

Metrics

CVSS 3.1 5.5/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected software

VendorProductVersions
LinuxLinux>= c0cfa2d8a788fcf45df5bf4070ab2474c88d543a, < 2ea5d2c79edcc99c7dbe0bb7518f5e1ee2a2391f; >= c0cfa2d8a788fcf45df5bf4070ab2474c88d543a, < fd51e810affa38d735d04261e673b2a5fe9c8665; >= c0cfa2d8a788fcf45df5bf4070ab2474c88d543a, < f66c7904fb6f0e420a654bc90909e64a25d00896; >= c0cfa2d8a788fcf45df5bf4070ab2474c88d543a, < 65c484726e74013a2ec7ba67a34d87760ae8f390; >= c0cfa2d8a788fcf45df5bf4070ab2474c88d543a, < 29371f3cc83e2a92265b4768014a30b80234112f; >= c0cfa2d8a788fcf45df5bf4070ab2474c88d543a, < e9edf9893cf26d060705c910a9b62d8cc96ed56a; >= c0cfa2d8a788fcf45df5bf4070ab2474c88d543a, < 6d3275fc4ed968938e1d556c344798046776668d; >= c0cfa2d8a788fcf45df5bf4070ab2474c88d543a, < 52bcb57a4e8a0865a76c587c2451906342ae1b2d
LinuxLinux5.5
SiemensSIMATIC S7-1500 TM MFP - GNU/Linux subsystem< *

References

Timeline

Published
May 28, 2026
Last modified
Nov 6, 2026
NVD status
Modified

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CVE-2026-46214: Medium severity, CVSS 5.5 | Vulnix