mlxsw: fix refcount leak in mlxsw_sp_vrs_lpm_tree_replace()
Key facts
- Attack vector
- —
- Privileges required
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- User interaction
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- Attack complexity
- —
- Impact type
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- Confidentiality · integrity · availability
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- Fix status
- Partial Red Hat: 5 without a fix
No CVSS vector from any source. Fix status from CNA and Red Hat.
Summary
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.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5, 7.2
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
Timeline
- 2026-10-02 Threatist record created from CVE-2026-72307
- 2026-10-03 Alias added: GHSA-7fcx-hvpg-5c9p
References
Other 8
- 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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Sources
- CVE-2026-72307 · CVE Program
- CVE-2026-72307 · NVD
- FIRST EPSS
- GHSA-7fcx-hvpg-5c9p · GitHub Advisory Database · CC BY 4.0
- CVE-2026-72307 · Red Hat security data · CC BY 4.0
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