{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "d021c344051af91f42c5ba9fdedc176740cbd238"
            },
            {
              "fixed": "22c587aa3ab1ab5264daff3ec32136fd30436c13"
            },
            {
              "fixed": "cf7090e255d74c4b61c51f8ede9fcacdd8393b5b"
            },
            {
              "fixed": "ea0b03d52881c12a8c634ea0d6cbfa61cefdb488"
            },
            {
              "fixed": "dfd853197615d322d3a88dbcab91fc0fd2096219"
            },
            {
              "fixed": "bcb275626055df7f8f947f1a349754b4004d9a15"
            },
            {
              "fixed": "ba9ad6015937a5e46ba1a31370e3efdec8abbdcc"
            },
            {
              "fixed": "9698582a4dd9c4a05889d7db96d4c0edc9e69cac"
            },
            {
              "fixed": "c05fa14db43ebef3bd862ca9d073981c0358b3f0"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.9.0"
            },
            {
              "fixed": "5.10.259"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.210"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.176"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.143"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.94"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.36"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.13"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53181.json"
  },
  "details": "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.",
  "id": "CVE-2026-53181",
  "modified": "2026-07-08T05:38:24.792634710Z",
  "published": "2026-06-25T08:38:55.994Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/22c587aa3ab1ab5264daff3ec32136fd30436c13"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9698582a4dd9c4a05889d7db96d4c0edc9e69cac"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ba9ad6015937a5e46ba1a31370e3efdec8abbdcc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bcb275626055df7f8f947f1a349754b4004d9a15"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c05fa14db43ebef3bd862ca9d073981c0358b3f0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cf7090e255d74c4b61c51f8ede9fcacdd8393b5b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dfd853197615d322d3a88dbcab91fc0fd2096219"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ea0b03d52881c12a8c634ea0d6cbfa61cefdb488"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53181.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53181"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "summary": "vsock/vmci: fix sk_ack_backlog leak on failed handshake"
}