CVE-2026-72022

llc: fix SAP refcount leak in llc_ui_autobind()

N/A

Published: August 15, 2026 at 05:51 AM UTC

Updated: August 17, 2026 at 06:17 AM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

N/A

Exploit prediction

EPSS 0.2%

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

2.6.12 ≤ v < 5.10.2612.6.12 ≤ v < 5.15.2122.6.12 ≤ v < 6.1.1782.6.12 ≤ v < 6.12.972.6.12 ≤ v < 6.18.402.6.12 ≤ v < 6.6.1452.6.12 ≤ v < 7.1.52.6.12 ≤ v < 7.21da177e4c3f41524e886b7f1b8a0c1fc7321cac2 2.6.12

Vendor states this is fixed in 21a537606fe35be2b85971a5fd35c0023b6ef98f (fixed)

Vendor states this is fixed in 61a7ff4a62003b55a15022567486741b3bd83914 (fixed)

Vendor states this is fixed in 660667cd406648bbaffbd5c0d897c2263a852f11 (fixed)

Vendor states this is fixed in 79dc4b508e3f2649390a1f745f7657813e5938ec (fixed)

Vendor states this is fixed in a2f9fa31ae021ef1fdcaf3ab17bd49f9223dd6a4 (fixed)

Vendor states this is fixed in b2fc9955ddc7c4ca03be44b995193bd6486c62e1 (fixed)

Vendor states this is fixed in b589a965184dde49c43b8caf5bcc65715a7b4ef2 (fixed)

Vendor states this is fixed in c7881b6088276601beaccb7440b8d56eab0d65ae (fixed)

Vendor states this is fixed in 2.6.12 (unaffected)

Vendor states this is fixed in 5.10.261 (unaffected)

Vendor states this is fixed in 5.15.212 (unaffected)

Vendor states this is fixed in 6.1.178 (unaffected)