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CVE-2026-72022: llc: fix SAP refcount leak in llc_ui_autobind()

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-15 · updated 2026-08-17

Description

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.

Affected products

• Linux kernel: 2.6.12 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/21a537606fe35be2b85971a5fd35c0023b6ef98f
• https://git.kernel.org/stable/c/61a7ff4a62003b55a15022567486741b3bd83914
• https://git.kernel.org/stable/c/660667cd406648bbaffbd5c0d897c2263a852f11
• https://git.kernel.org/stable/c/79dc4b508e3f2649390a1f745f7657813e5938ec
• https://git.kernel.org/stable/c/a2f9fa31ae021ef1fdcaf3ab17bd49f9223dd6a4
• https://git.kernel.org/stable/c/b2fc9955ddc7c4ca03be44b995193bd6486c62e1
• https://git.kernel.org/stable/c/b589a965184dde49c43b8caf5bcc65715a7b4ef2
• https://git.kernel.org/stable/c/c7881b6088276601beaccb7440b8d56eab0d65ae

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