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vsock/vmci: fix sk_ack_backlog leak on failed handshake

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-53181

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-53181

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "d021c344051af91f42c5ba9fdedc176740cbd238",
        "lessThan": "22c587aa3ab1ab5264daff3ec32136fd30436c13",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d021c344051af91f42c5ba9fdedc176740cbd238",
        "lessThan": "cf7090e255d74c4b61c51f8ede9fcacdd8393b5b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d021c344051af91f42c5ba9fdedc176740cbd238",
        "lessThan": "ea0b03d52881c12a8c634ea0d6cbfa61cefdb488",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d021c344051af91f42c5ba9fdedc176740cbd238",
        "lessThan": "dfd853197615d322d3a88dbcab91fc0fd2096219",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d021c344051af91f42c5ba9fdedc176740cbd238",
        "lessThan": "bcb275626055df7f8f947f1a349754b4004d9a15",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d021c344051af91f42c5ba9fdedc176740cbd238",
        "lessThan": "ba9ad6015937a5e46ba1a31370e3efdec8abbdcc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d021c344051af91f42c5ba9fdedc176740cbd238",
        "lessThan": "9698582a4dd9c4a05889d7db96d4c0edc9e69cac",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d021c344051af91f42c5ba9fdedc176740cbd238",
        "lessThan": "c05fa14db43ebef3bd862ca9d073981c0358b3f0",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/vmw_vsock/vmci_transport.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.9"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.9",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.259",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.210",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.176",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.143",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.94",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.36",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.13",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/vmw_vsock/vmci_transport.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-53181

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#28434 · Revision 1
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Publisher date
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