CVE-2026-53181 (GCVE-0-2026-53181)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:38 – Updated: 2026-06-25 08:38
VLAI
Title
vsock/vmci: fix sk_ack_backlog leak on failed handshake
Summary
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: d021c344051af91f42c5ba9fdedc176740cbd238 , < 22c587aa3ab1ab5264daff3ec32136fd30436c13 (git)
Affected: d021c344051af91f42c5ba9fdedc176740cbd238 , < cf7090e255d74c4b61c51f8ede9fcacdd8393b5b (git)
Affected: d021c344051af91f42c5ba9fdedc176740cbd238 , < ea0b03d52881c12a8c634ea0d6cbfa61cefdb488 (git)
Affected: d021c344051af91f42c5ba9fdedc176740cbd238 , < dfd853197615d322d3a88dbcab91fc0fd2096219 (git)
Affected: d021c344051af91f42c5ba9fdedc176740cbd238 , < bcb275626055df7f8f947f1a349754b4004d9a15 (git)
Affected: d021c344051af91f42c5ba9fdedc176740cbd238 , < ba9ad6015937a5e46ba1a31370e3efdec8abbdcc (git)
Affected: d021c344051af91f42c5ba9fdedc176740cbd238 , < 9698582a4dd9c4a05889d7db96d4c0edc9e69cac (git)
Affected: d021c344051af91f42c5ba9fdedc176740cbd238 , < c05fa14db43ebef3bd862ca9d073981c0358b3f0 (git)
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Linux Linux Affected: 3.9
Unaffected: 0 , < 3.9 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.94 , ≤ 6.12.* (semver)
Unaffected: 6.18.36 , ≤ 6.18.* (semver)
Unaffected: 7.0.13 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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          "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."
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      "providerMetadata": {
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "datePublished": "2026-06-25T08:38:55.994Z",
    "dateReserved": "2026-06-09T07:44:35.390Z",
    "dateUpdated": "2026-06-25T08:38:55.994Z",
    "state": "PUBLISHED"
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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\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/vmw_vsock/vmci_transport.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"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\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/vmw_vsock/vmci_transport.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.9\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.9\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.259\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.210\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.176\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.143\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.94\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.36\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.13\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/22c587aa3ab1ab5264daff3ec32136fd30436c13\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9698582a4dd9c4a05889d7db96d4c0edc9e69cac\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ba9ad6015937a5e46ba1a31370e3efdec8abbdcc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bcb275626055df7f8f947f1a349754b4004d9a15\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c05fa14db43ebef3bd862ca9d073981c0358b3f0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cf7090e255d74c4b61c51f8ede9fcacdd8393b5b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dfd853197615d322d3a88dbcab91fc0fd2096219\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ea0b03d52881c12a8c634ea0d6cbfa61cefdb488\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.