CVE Catalog

CVE-2026-72022

Low risk· EPSS 12%
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.21%

12th percentile - higher than 12% of all known CVEs

Summary

In the Linux kernel, in the llc_ui_autobind() function, there is a SAP refcount leak. After successful autobind, the caller's reference is not dropped, leading to exhaustion of dynamic SAP values and -EUSERS errors on subsequent autobinds. The fix drops the reference after successful autobind, matching llc_ui_bind()'s model.

Risk Assessment

Potential exhaustion of SAP resources, preventing new LLC connections and affecting network service availability.

Recommendation

It is recommended to update the Linux kernel to a patched version and monitor the number of active LLC connections.

Other vulnerabilities in Linux kernel

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Original NVD description (English source)

In the Linux kernel, the following vulnerability has been resolved: llc: fix SAP refcount leak in llc_ui_autobind() llc_ui_autobind() opens a SAP after choosing a dynamic LSAP. llc_sap_open() returns a reference owned by the caller, and llc_sap_add_socket() takes a second reference for the socket's membership in the SAP hash tables. llc_ui_bind() drops the caller's reference after adding the socket, but llc_ui_autobind() keeps it. When the socket is closed, llc_sap_remove_socket() releases only the socket reference, leaving the SAP on llc_sap_list with sk_count == 0. This is user-visible because repeated autobind and close cycles can consume all dynamic SAP values and make later autobinds fail with -EUSERS. Drop the caller's reference after a successful autobind, matching llc_ui_bind()'s ownership model.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS