vsock/vmci: fix sk_ack_backlog leak on failed handshake
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.
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
- Added to Heist Feed
- Publisher date