{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-53181","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-06-09T07:44:35.390Z","datePublished":"2026-06-25T08:38:55.994Z","dateUpdated":"2026-06-25T08:38:55.994Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-06-25T08:38:55.994Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nvsock/vmci: fix sk_ack_backlog leak on failed handshake\n\nWhen vmci_transport_recv_connecting_server() returns an error,\nvmci_transport_recv_listen() calls vsock_remove_pending() but never\ncalls sk_acceptq_removed(). This leaves sk_ack_backlog incremented\npermanently.\n\nRepeated handshake failures (malformed packets, queue pair alloc\nfailure, event subscribe failure) cause sk_ack_backlog to climb\ntoward sk_max_ack_backlog. Once it reaches the limit the listener\npermanently refuses all new connections with -ECONNREFUSED, a\nsilent denial of service requiring a process restart to recover.\n\nThe two existing sk_acceptq_removed() calls in af_vsock.c do not\ncover this path: line 764 checks vsock_is_pending() which returns\nfalse after vsock_remove_pending(), and line 1889 is only reached\non successful accept().\n\nFix by balancing sk_acceptq_added() with sk_acceptq_removed() on\nthe error path."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/vmw_vsock/vmci_transport.c"],"versions":[{"version":"d021c344051af91f42c5ba9fdedc176740cbd238","lessThan":"22c587aa3ab1ab5264daff3ec32136fd30436c13","status":"affected","versionType":"git"},{"version":"d021c344051af91f42c5ba9fdedc176740cbd238","lessThan":"cf7090e255d74c4b61c51f8ede9fcacdd8393b5b","status":"affected","versionType":"git"},{"version":"d021c344051af91f42c5ba9fdedc176740cbd238","lessThan":"ea0b03d52881c12a8c634ea0d6cbfa61cefdb488","status":"affected","versionType":"git"},{"version":"d021c344051af91f42c5ba9fdedc176740cbd238","lessThan":"dfd853197615d322d3a88dbcab91fc0fd2096219","status":"affected","versionType":"git"},{"version":"d021c344051af91f42c5ba9fdedc176740cbd238","lessThan":"bcb275626055df7f8f947f1a349754b4004d9a15","status":"affected","versionType":"git"},{"version":"d021c344051af91f42c5ba9fdedc176740cbd238","lessThan":"ba9ad6015937a5e46ba1a31370e3efdec8abbdcc","status":"affected","versionType":"git"},{"version":"d021c344051af91f42c5ba9fdedc176740cbd238","lessThan":"9698582a4dd9c4a05889d7db96d4c0edc9e69cac","status":"affected","versionType":"git"},{"version":"d021c344051af91f42c5ba9fdedc176740cbd238","lessThan":"c05fa14db43ebef3bd862ca9d073981c0358b3f0","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/vmw_vsock/vmci_transport.c"],"versions":[{"version":"3.9","status":"affected"},{"version":"0","lessThan":"3.9","status":"unaffected","versionType":"semver"},{"version":"5.10.259","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.210","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.176","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.143","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.94","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.36","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.0.13","lessThanOrEqual":"7.0.*","status":"unaffected","versionType":"semver"},{"version":"7.1","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.9","versionEndExcluding":"5.10.259"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.9","versionEndExcluding":"5.15.210"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.9","versionEndExcluding":"6.1.176"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.9","versionEndExcluding":"6.6.143"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.9","versionEndExcluding":"6.12.94"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.9","versionEndExcluding":"6.18.36"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.9","versionEndExcluding":"7.0.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.9","versionEndExcluding":"7.1"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/22c587aa3ab1ab5264daff3ec32136fd30436c13"},{"url":"https://git.kernel.org/stable/c/cf7090e255d74c4b61c51f8ede9fcacdd8393b5b"},{"url":"https://git.kernel.org/stable/c/ea0b03d52881c12a8c634ea0d6cbfa61cefdb488"},{"url":"https://git.kernel.org/stable/c/dfd853197615d322d3a88dbcab91fc0fd2096219"},{"url":"https://git.kernel.org/stable/c/bcb275626055df7f8f947f1a349754b4004d9a15"},{"url":"https://git.kernel.org/stable/c/ba9ad6015937a5e46ba1a31370e3efdec8abbdcc"},{"url":"https://git.kernel.org/stable/c/9698582a4dd9c4a05889d7db96d4c0edc9e69cac"},{"url":"https://git.kernel.org/stable/c/c05fa14db43ebef3bd862ca9d073981c0358b3f0"}],"title":"vsock/vmci: fix sk_ack_backlog leak on failed handshake","x_generator":{"engine":"bippy-1.2.0"}}}}