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.
Affected products
linux: linux kernel
References9
- git.kernel.org/stable/c/29371f3cc83e2a92265b4768014a30b80234112f Patch
- git.kernel.org/stable/c/2ea5d2c79edcc99c7dbe0bb7518f5e1ee2a2391f Patch
- git.kernel.org/stable/c/52bcb57a4e8a0865a76c587c2451906342ae1b2d Patch
- git.kernel.org/stable/c/65c484726e74013a2ec7ba67a34d87760ae8f390 Patch
- git.kernel.org/stable/c/6d3275fc4ed968938e1d556c344798046776668d Patch
- git.kernel.org/stable/c/e9edf9893cf26d060705c910a9b62d8cc96ed56a Patch
- git.kernel.org/stable/c/f66c7904fb6f0e420a654bc90909e64a25d00896 Patch
- git.kernel.org/stable/c/fd51e810affa38d735d04261e673b2a5fe9c8665 Patch
- cert-portal.siemens.com/productcert/html/ssa-784472.html
Metrics
- CVSS 3.1
-
5.5
MEDIUM
Score source: NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - EPSS — exploit probability
- 0% percentile: 3 · as of 15 November 2026
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