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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{
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"version": "0",
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{
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"status": "unaffected",
"version": "5.10.259",
"versionType": "semver"
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{
"lessThanOrEqual": "5.15.*",
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"version": "5.15.210",
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{
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"version": "6.1.176",
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{
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"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",
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"references": [
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"url": "https://git.kernel.org/stable/c/22c587aa3ab1ab5264daff3ec32136fd30436c13"
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"url": "https://git.kernel.org/stable/c/cf7090e255d74c4b61c51f8ede9fcacdd8393b5b"
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{
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{
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"url": "https://git.kernel.org/stable/c/ba9ad6015937a5e46ba1a31370e3efdec8abbdcc"
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"url": "https://git.kernel.org/stable/c/9698582a4dd9c4a05889d7db96d4c0edc9e69cac"
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{
"url": "https://git.kernel.org/stable/c/c05fa14db43ebef3bd862ca9d073981c0358b3f0"
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"title": "vsock/vmci: fix sk_ack_backlog leak on failed handshake",
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"cveMetadata": {
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"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"
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"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
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.
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