{"api_version":"1","generated_at":"2026-07-02T22:08:20+00:00","cve":"CVE-2026-53181","urls":{"html":"https://cve.report/CVE-2026-53181","api":"https://cve.report/api/cve/CVE-2026-53181.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-53181","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-53181"},"summary":{"title":"vsock/vmci: fix sk_ack_backlog leak on failed handshake","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-06-25 09:16:35","updated_at":"2026-06-30 14:44:27"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/cf7090e255d74c4b61c51f8ede9fcacdd8393b5b","name":"https://git.kernel.org/stable/c/cf7090e255d74c4b61c51f8ede9fcacdd8393b5b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/22c587aa3ab1ab5264daff3ec32136fd30436c13","name":"https://git.kernel.org/stable/c/22c587aa3ab1ab5264daff3ec32136fd30436c13","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9698582a4dd9c4a05889d7db96d4c0edc9e69cac","name":"https://git.kernel.org/stable/c/9698582a4dd9c4a05889d7db96d4c0edc9e69cac","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/bcb275626055df7f8f947f1a349754b4004d9a15","name":"https://git.kernel.org/stable/c/bcb275626055df7f8f947f1a349754b4004d9a15","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ea0b03d52881c12a8c634ea0d6cbfa61cefdb488","name":"https://git.kernel.org/stable/c/ea0b03d52881c12a8c634ea0d6cbfa61cefdb488","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/dfd853197615d322d3a88dbcab91fc0fd2096219","name":"https://git.kernel.org/stable/c/dfd853197615d322d3a88dbcab91fc0fd2096219","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ba9ad6015937a5e46ba1a31370e3efdec8abbdcc","name":"https://git.kernel.org/stable/c/ba9ad6015937a5e46ba1a31370e3efdec8abbdcc","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c05fa14db43ebef3bd862ca9d073981c0358b3f0","name":"https://git.kernel.org/stable/c/c05fa14db43ebef3bd862ca9d073981c0358b3f0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-53181","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53181","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d021c344051af91f42c5ba9fdedc176740cbd238 22c587aa3ab1ab5264daff3ec32136fd30436c13 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d021c344051af91f42c5ba9fdedc176740cbd238 cf7090e255d74c4b61c51f8ede9fcacdd8393b5b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d021c344051af91f42c5ba9fdedc176740cbd238 ea0b03d52881c12a8c634ea0d6cbfa61cefdb488 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d021c344051af91f42c5ba9fdedc176740cbd238 dfd853197615d322d3a88dbcab91fc0fd2096219 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.210 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.176 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.143 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.94 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.36 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.13 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"53181","cve":"CVE-2026-53181","epss":"0.001840000","percentile":"0.082110000","score_date":"2026-07-01","updated_at":"2026-07-02 00:05:25"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/vmw_vsock/vmci_transport.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"22c587aa3ab1ab5264daff3ec32136fd30436c13","status":"affected","version":"d021c344051af91f42c5ba9fdedc176740cbd238","versionType":"git"},{"lessThan":"cf7090e255d74c4b61c51f8ede9fcacdd8393b5b","status":"affected","version":"d021c344051af91f42c5ba9fdedc176740cbd238","versionType":"git"},{"lessThan":"ea0b03d52881c12a8c634ea0d6cbfa61cefdb488","status":"affected","version":"d021c344051af91f42c5ba9fdedc176740cbd238","versionType":"git"},{"lessThan":"dfd853197615d322d3a88dbcab91fc0fd2096219","status":"affected","version":"d021c344051af91f42c5ba9fdedc176740cbd238","versionType":"git"},{"lessThan":"bcb275626055df7f8f947f1a349754b4004d9a15","status":"affected","version":"d021c344051af91f42c5ba9fdedc176740cbd238","versionType":"git"},{"lessThan":"ba9ad6015937a5e46ba1a31370e3efdec8abbdcc","status":"affected","version":"d021c344051af91f42c5ba9fdedc176740cbd238","versionType":"git"},{"lessThan":"9698582a4dd9c4a05889d7db96d4c0edc9e69cac","status":"affected","version":"d021c344051af91f42c5ba9fdedc176740cbd238","versionType":"git"},{"lessThan":"c05fa14db43ebef3bd862ca9d073981c0358b3f0","status":"affected","version":"d021c344051af91f42c5ba9fdedc176740cbd238","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/vmw_vsock/vmci_transport.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"3.9"},{"lessThan":"3.9","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.259","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.210","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.176","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.143","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.94","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.36","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.13","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.259","versionStartIncluding":"3.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.210","versionStartIncluding":"3.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.176","versionStartIncluding":"3.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.143","versionStartIncluding":"3.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.94","versionStartIncluding":"3.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.36","versionStartIncluding":"3.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.13","versionStartIncluding":"3.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1","versionStartIncluding":"3.9","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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."}],"providerMetadata":{"dateUpdated":"2026-06-25T08:38:55.994Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-53181","datePublished":"2026-06-25T08:38:55.994Z","dateReserved":"2026-06-09T07:44:35.390Z","dateUpdated":"2026-06-25T08:38:55.994Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-06-25 09:16:35","lastModifiedDate":"2026-06-30 14:44:27","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"53181","Ordinal":"1","Title":"vsock/vmci: fix sk_ack_backlog leak on failed handshake","CVE":"CVE-2026-53181","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"53181","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"vsock/vmci: fix sk_ack_backlog leak on failed handshake"}]}}}