Medium 5.5Published May 28, 2026

CVE-2026-46214vsock/virtio: fix accept queue count leak on transport mismatch

Updated under an hour ago (Oct 27, 2026, 10:10 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from c0cfa2d8a788fcf45df5bf4070ab2474c88d543a before 2ea5d2c79edcc99c7dbe0bb7518f5e1ee2a2391f; from c0cfa2d8a788fcf45df5bf4070ab2474c88d543a before fd51e810affa38d735d04261e673b2a5fe9c8665; from c0cfa2d8a788fcf45df5bf4070ab2474c88d543a before f66c7904fb6f0e420a654bc90909e64a25d00896; from c0cfa2d8a788fcf45df5bf4070ab2474c88d543a before 65c484726e74013a2ec7ba67a34d87760ae8f390; from c0cfa2d8a788fcf45df5bf4070ab2474c88d543a before 29371f3cc83e2a92265b4768014a30b80234112f; from c0cfa2d8a788fcf45df5bf4070ab2474c88d543a before e9edf9893cf26d060705c910a9b62d8cc96ed56a; from c0cfa2d8a788fcf45df5bf4070ab2474c88d543a before 6d3275fc4ed968938e1d556c344798046776668d; from c0cfa2d8a788fcf45df5bf4070ab2474c88d543a before 52bcb57a4e8a0865a76c587c2451906342ae1b2d	CNA record
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name)	all versions	CISA ADP
linux linux_kernel linux:linux_kernel	from 5.5 before 5.10.258; from 5.11 before 5.15.209; from 5.16 before 6.1.175; from 6.2 before 6.6.140; from 6.7 before 6.12.90; from 6.13 before 6.18.32; from 6.19 before 7.0.9	NVD

References

References

https://git.kernel.org/stable/c/2ea5d2c79edcc99c7dbe0bb7518f5e1ee2a2391f	patch
https://git.kernel.org/stable/c/fd51e810affa38d735d04261e673b2a5fe9c8665	patch
https://git.kernel.org/stable/c/f66c7904fb6f0e420a654bc90909e64a25d00896	patch
https://git.kernel.org/stable/c/65c484726e74013a2ec7ba67a34d87760ae8f390	patch
https://git.kernel.org/stable/c/29371f3cc83e2a92265b4768014a30b80234112f	patch
https://git.kernel.org/stable/c/e9edf9893cf26d060705c910a9b62d8cc96ed56a	patch
https://git.kernel.org/stable/c/6d3275fc4ed968938e1d556c344798046776668d	patch
https://git.kernel.org/stable/c/52bcb57a4e8a0865a76c587c2451906342ae1b2d	patch
https://cert-portal.siemens.com/productcert/html/ssa-784472.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.