CVE-2026-46214

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinuxc0cfa2d8a788fcf45df5bf4070ab2474c88d543a < 2ea5d2c79edcc99c7dbe0bb7518f5e1ee2a2391faffected
LinuxLinuxc0cfa2d8a788fcf45df5bf4070ab2474c88d543a < fd51e810affa38d735d04261e673b2a5fe9c8665affected
LinuxLinuxc0cfa2d8a788fcf45df5bf4070ab2474c88d543a < f66c7904fb6f0e420a654bc90909e64a25d00896affected
LinuxLinuxc0cfa2d8a788fcf45df5bf4070ab2474c88d543a < 65c484726e74013a2ec7ba67a34d87760ae8f390affected
LinuxLinuxc0cfa2d8a788fcf45df5bf4070ab2474c88d543a < 29371f3cc83e2a92265b4768014a30b80234112faffected
LinuxLinuxc0cfa2d8a788fcf45df5bf4070ab2474c88d543a < e9edf9893cf26d060705c910a9b62d8cc96ed56aaffected
LinuxLinuxc0cfa2d8a788fcf45df5bf4070ab2474c88d543a < 6d3275fc4ed968938e1d556c344798046776668daffected
LinuxLinuxc0cfa2d8a788fcf45df5bf4070ab2474c88d543a < 52bcb57a4e8a0865a76c587c2451906342ae1b2daffected
LinuxLinux5.5affected
LinuxLinux0 < 5.5unaffected
LinuxLinux5.10.258 <= 5.10.*unaffected
LinuxLinux5.15.209 <= 5.15.*unaffected
LinuxLinux6.1.175 <= 6.1.*unaffected
LinuxLinux6.6.140 <= 6.6.*unaffected
LinuxLinux6.12.90 <= 6.12.*unaffected
LinuxLinux6.18.32 <= 6.18.*unaffected
LinuxLinux7.0.9 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References