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CVE-2026-72308: mlxsw: fix refcount leak in mlxsw_sp_port_lag_join()

• 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 2026-08-23

Description

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.

Affected products

• Linux kernel: 4.5 — 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/1cf8a1af42b1f12a30b7abd34fe4fc23b3170e7e
• https://git.kernel.org/stable/c/2d8b3c3e129973a51ae924bdcf6993a76b828814
• https://git.kernel.org/stable/c/3fbeaa8ecd144ad593f9fa1ab4b40a780ad3700b
• https://git.kernel.org/stable/c/41c8c1d65b32beacd8d916a22457b4f6e47f45af
• https://git.kernel.org/stable/c/8b3350eacd9df0597bfe36a594df7b9def0b3edf
• https://git.kernel.org/stable/c/99ff5b0083eae6f774360c4ea6874604e6c9b553
• https://git.kernel.org/stable/c/9bf2d6eea26a226f8ebab7baea6f2b018f914560
• https://git.kernel.org/stable/c/cab468c3c03f4bcd7530ce2783a4140da14efb7b

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