{"cve":{"cve_id":"CVE-2026-53181","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":null,"epss_percentile":null,"epss_as_of":null,"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.","published_at":"2026-06-25T08:38:55.994000Z","last_modified_at":null,"cvss_v3_score":null,"cvss_v3_vector":null,"cvss_v3_severity":null,"cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":null,"nvd_references":["https://git.kernel.org/stable/c/22c587aa3ab1ab5264daff3ec32136fd30436c13","https://git.kernel.org/stable/c/cf7090e255d74c4b61c51f8ede9fcacdd8393b5b","https://git.kernel.org/stable/c/ea0b03d52881c12a8c634ea0d6cbfa61cefdb488","https://git.kernel.org/stable/c/dfd853197615d322d3a88dbcab91fc0fd2096219","https://git.kernel.org/stable/c/bcb275626055df7f8f947f1a349754b4004d9a15","https://git.kernel.org/stable/c/ba9ad6015937a5e46ba1a31370e3efdec8abbdcc","https://git.kernel.org/stable/c/9698582a4dd9c4a05889d7db96d4c0edc9e69cac","https://git.kernel.org/stable/c/c05fa14db43ebef3bd862ca9d073981c0358b3f0"],"vuln_status":null,"trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-28T17:55:28.590503Z","updated_at":"2026-06-28T23:30:51.545322Z"},"effective_severity":null,"badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":null,"metrics":[]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"d021c344051af91f42c5ba9fdedc176740cbd238","version_start_inclusive":true,"version_end":"22c587aa3ab1ab5264daff3ec32136fd30436c13","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:d021c344051af91f42c5ba9fdedc176740cbd238:22c587aa3ab1ab5264daff3ec32136fd30436c13"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"d021c344051af91f42c5ba9fdedc176740cbd238","version_start_inclusive":true,"version_end":"cf7090e255d74c4b61c51f8ede9fcacdd8393b5b","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:d021c344051af91f42c5ba9fdedc176740cbd238:cf7090e255d74c4b61c51f8ede9fcacdd8393b5b"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"d021c344051af91f42c5ba9fdedc176740cbd238","version_start_inclusive":true,"version_end":"ea0b03d52881c12a8c634ea0d6cbfa61cefdb488","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:d021c344051af91f42c5ba9fdedc176740cbd238:ea0b03d52881c12a8c634ea0d6cbfa61cefdb488"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"d021c344051af91f42c5ba9fdedc176740cbd238","version_start_inclusive":true,"version_end":"dfd853197615d322d3a88dbcab91fc0fd2096219","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:d021c344051af91f42c5ba9fdedc176740cbd238:dfd853197615d322d3a88dbcab91fc0fd2096219"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"d021c344051af91f42c5ba9fdedc176740cbd238","version_start_inclusive":true,"version_end":"bcb275626055df7f8f947f1a349754b4004d9a15","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:d021c344051af91f42c5ba9fdedc176740cbd238:bcb275626055df7f8f947f1a349754b4004d9a15"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"d021c344051af91f42c5ba9fdedc176740cbd238","version_start_inclusive":true,"version_end":"ba9ad6015937a5e46ba1a31370e3efdec8abbdcc","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:d021c344051af91f42c5ba9fdedc176740cbd238:ba9ad6015937a5e46ba1a31370e3efdec8abbdcc"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"d021c344051af91f42c5ba9fdedc176740cbd238","version_start_inclusive":true,"version_end":"9698582a4dd9c4a05889d7db96d4c0edc9e69cac","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:d021c344051af91f42c5ba9fdedc176740cbd238:9698582a4dd9c4a05889d7db96d4c0edc9e69cac"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"d021c344051af91f42c5ba9fdedc176740cbd238","version_start_inclusive":true,"version_end":"c05fa14db43ebef3bd862ca9d073981c0358b3f0","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:d021c344051af91f42c5ba9fdedc176740cbd238:c05fa14db43ebef3bd862ca9d073981c0358b3f0"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"3.9","version_start_inclusive":true,"version_end":"3.9","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:3.9:3.9"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"0","version_start_inclusive":true,"version_end":"3.9","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:0:3.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published","source":null}]}