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GHSA-7FCX-HVPG-5C9P

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-15 06:32
VLAI
Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-72307"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:22:03Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmlxsw: fix refcount leak in mlxsw_sp_vrs_lpm_tree_replace()\n\nWhen mlxsw_sp_vrs_lpm_tree_replace() fails after replacing some VRs,\nthe error rollback loop does not correctly revert the preceding\nreplacements. The loop decrements the index but fails to update the\nvr pointer, which still points to the VR that caused the failure. As\na result, the condition and the rollback call always operate on the\nsame VR, potentially calling mlxsw_sp_vr_lpm_tree_replace() multiple\ntimes on it while never rolling back the earlier VRs. Those VRs\ncontinue to hold a reference to new_tree acquired via\nmlxsw_sp_lpm_tree_hold(), leaking the reference count of new_tree.\n\nFix by reinitializing vr inside the error loop with the updated index:\n\n\tvr = \u0026mlxsw_sp-\u003erouter-\u003evrs[i];\n\nso that the loop correctly iterates over all VRs that were actually\nreplaced.",
  "id": "GHSA-7fcx-hvpg-5c9p",
  "modified": "2026-08-15T06:32:19Z",
  "published": "2026-08-15T06:32:19Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72307"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/21cf8dc478a49e8de039c2739b1646a774cb1944"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/220d41bdce41fe5a39a7f419faab1e907b4093c2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3a2b47d1b4b3de54d030a7fdb6a322c970513ee3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7203ac71d3895fa5948b319dd724f0e1cffbc4a1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8adebf07b46df79a0e49a6d4ae384f0db7c91db6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9e4a6185679922305ea1df68403f00ccc512656b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c2c75c45b54f3b12eafb28a4eb47f8821512c1aa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f6454a5fbf2224ad30ec70e686a6c592561da1f2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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