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CVE-2026-53181

vsock/vmci: fix sk_ack_backlog leak on failed handshake

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.94, and 2 more
None on Exploit-DB, Metasploit or GitHub

Summary

In the Linux kernel, the following vulnerability has been resolved: vsock/vmci: fix sk_ack_backlog leak on failed handshake When vmci_transport_recv_connecting_server() returns an error, vmci_transport_recv_listen() calls vsock_remove_pending() but never calls sk_acceptq_removed(). This leaves sk_ack_backlog incremented permanently. Repeated handshake failures (malformed packets, queue pair alloc failure, event subscribe failure) cause sk_ack_backlog to climb toward sk_max_ack_backlog. Once it reaches the limit the listener permanently refuses all new connections with -ECONNREFUSED, a silent denial of service requiring a process restart to recover. The two existing sk_acceptq_removed() calls in af_vsock.c do not cover this path: line 764 checks vsock_is_pending() which returns false after vsock_remove_pending(), and line 1889 is only reached on successful accept(). Fix by balancing sk_acceptq_added() with sk_acceptq_removed() on the error path.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From d021c344051af91f42c5ba9fdedc176740cbd238 · fixed in 22c587aa3ab1ab5264daff3ec32136fd30436c13; From d021c344051af91f42c5ba9fdedc176740cbd238 · fixed in cf7090e255d74c4b61c51f8ede9fcacdd8393b5b; From d021c344051af91f42c5ba9fdedc176740cbd238 · fixed in ea0b03d52881c12a8c634ea0d6cbfa61cefdb488; From d021c344051af91f42c5ba9fdedc176740cbd238 · fixed in dfd853197615d322d3a88dbcab91fc0fd2096219; From d021c344051af91f42c5ba9fdedc176740cbd238 · fixed in bcb275626055df7f8f947f1a349754b4004d9a15; From d021c344051af91f42c5ba9fdedc176740cbd238 · fixed in ba9ad6015937a5e46ba1a31370e3efdec8abbdcc; From d021c344051af91f42c5ba9fdedc176740cbd238 · fixed in 9698582a4dd9c4a05889d7db96d4c0edc9e69cac; From d021c344051af91f42c5ba9fdedc176740cbd238 · fixed in c05fa14db43ebef3bd862ca9d073981c0358b3f0

  • Linux Linux

    3.9

  • KernelLinux

    From 3.9.0 · fixed in 5.10.259; From 5.11.0 · fixed in 5.15.210; From 5.16.0 · fixed in 6.1.176; From 6.2.0 · fixed in 6.6.143; From 6.7.0 · fixed in 6.12.94; From 6.13.0 · fixed in 6.18.36; From 6.19.0 · fixed in 7.0.13

References 8

git.kernel.org