CVE-2026-72307
Low risk· EPSS 13%Exploitation Probability (EPSS)
Low risk13th percentile - higher than 13% of all known CVEs
Summary
In the Linux kernel mlxsw driver, mlxsw_sp_vrs_lpm_tree_replace() in the error rollback loop does not update the vr pointer, causing the loop to operate on the same VR and not roll back earlier replacements. This leads to a reference leak to new_tree. The fix reinitializes vr inside the loop with the updated index.
Risk Assessment
Reference leak can lead to resource exhaustion, potentially affecting system stability or network operation.
Recommendation
Apply the kernel patch that correctly iterates over all VRs in the rollback loop.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: mlxsw: fix refcount leak in mlxsw_sp_vrs_lpm_tree_replace() When mlxsw_sp_vrs_lpm_tree_replace() fails after replacing some VRs, the error rollback loop does not correctly revert the preceding replacements. The loop decrements the index but fails to update the vr pointer, which still points to the VR that caused the failure. As a result, the condition and the rollback call always operate on the same VR, potentially calling mlxsw_sp_vr_lpm_tree_replace() multiple times on it while never rolling back the earlier VRs. Those VRs continue to hold a reference to new_tree acquired via mlxsw_sp_lpm_tree_hold(), leaking the reference count of new_tree. Fix by reinitializing vr inside the error loop with the updated index: vr = &mlxsw_sp->router->vrs[i]; so that the loop correctly iterates over all VRs that were actually replaced.