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

Vulnerability from cvelistv5 – Published: 2026-06-25 08:38 – Updated: 2026-11-06 16:24
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.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-06 16:21 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
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)
guessed Create a notification for this product.
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)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Affected: 0 , < * (custom)
guessed Create a notification for this product.
Show details on NVD website
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