Vulnerability Description
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.
References
- https://git.kernel.org/stable/c/21cf8dc478a49e8de039c2739b1646a774cb1944
- https://git.kernel.org/stable/c/220d41bdce41fe5a39a7f419faab1e907b4093c2
- https://git.kernel.org/stable/c/3a2b47d1b4b3de54d030a7fdb6a322c970513ee3
- https://git.kernel.org/stable/c/7203ac71d3895fa5948b319dd724f0e1cffbc4a1
- https://git.kernel.org/stable/c/8adebf07b46df79a0e49a6d4ae384f0db7c91db6
- https://git.kernel.org/stable/c/9e4a6185679922305ea1df68403f00ccc512656b
- https://git.kernel.org/stable/c/c2c75c45b54f3b12eafb28a4eb47f8821512c1aa
- https://git.kernel.org/stable/c/f6454a5fbf2224ad30ec70e686a6c592561da1f2
FAQ
What is CVE-2026-72307?
CVE-2026-72307 is a documented vulnerability. 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, t...
How severe is CVE-2026-72307?
CVSS scoring is not yet available for CVE-2026-72307. Check NVD for updates.
Is there a patch for CVE-2026-72307?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.