Bug 2516246 (CVE-2026-72308)

Summary: CVE-2026-72308 kernel: mlxsw: fix refcount leak in mlxsw_sp_port_lag_join()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: low    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
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Hardware: All   
OS: Linux   
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A flaw was found in the `mlxsw` driver of the Linux kernel. This vulnerability occurs when the `mlxsw_sp_port_lag_join()` function fails to properly release a network resource reference, leading to a reference count leak. Over time, this leak could exhaust system resources, potentially resulting in a denial of service (DoS) for affected systems.
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Description OSIDB Bzimport 2026-08-15 06:02:29 UTC 
In the Linux kernel, the following vulnerability has been resolved:

mlxsw: fix refcount leak in mlxsw_sp_port_lag_join()

When mlxsw_sp_port_lag_index_get() fails, mlxsw_sp_port_lag_join()
returns an error without releasing the lag reference obtained by
the earlier mlxsw_sp_lag_get().  All other error paths in the
function jump to the cleanup label that ends with
mlxsw_sp_lag_put(), so this is a single missed release.

Fix the leak by replacing the bare 'return err' with a goto to the
existing error cleanup label, which will drop the reference safely.
Comment 1 gkamathe 2026-08-17 12:20:59 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081504-CVE-2026-72308-c2fb@gregkh/T