CVE-2026-98705 (GCVE-0-2026-98705)
Vulnerability from cvelistv5
Published
2026-10-18 15:46
Modified
2026-10-21 12:55
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: account proxy paths against the mesh path limit Proxy-path churn can drive the interface path counter negative and let later mesh path additions exceed MESH_MAX_MPATHS. mesh_path_free_rcu() decrements the interface mpaths counter for entries from both the mesh and proxy path tables, but mpp_path_add() never reserves a slot in that counter. Removing or expiring a proxy path therefore returns a slot that was never charged. mesh_path_add() uses the same counter to enforce MESH_MAX_MPATHS, so once it falls below the number of installed paths the limit no longer holds. Reserve the shared quota before allocating a proxy path and release it on every unsuccessful addition. Mesh and proxy paths now share one 1024-entry budget, so mpp_path_add() can return -ENOSPC at that limit.
References
Impacted products
Vendor Product Version
Linux Linux Version: ece1a2e7e86078c8379937b546e32cb7f25fcb6c
Version: ece1a2e7e86078c8379937b546e32cb7f25fcb6c
Version: ece1a2e7e86078c8379937b546e32cb7f25fcb6c
Version: ece1a2e7e86078c8379937b546e32cb7f25fcb6c
Version: ece1a2e7e86078c8379937b546e32cb7f25fcb6c
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{
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/mac80211/mesh_pathtbl.c"
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              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: account proxy paths against the mesh path limit\n\nProxy-path churn can drive the interface path counter negative and let\nlater mesh path additions exceed MESH_MAX_MPATHS.\n\nmesh_path_free_rcu() decrements the interface mpaths counter for entries\nfrom both the mesh and proxy path tables, but mpp_path_add() never\nreserves a slot in that counter. Removing or expiring a proxy path\ntherefore returns a slot that was never charged.\n\nmesh_path_add() uses the same counter to enforce MESH_MAX_MPATHS, so once\nit falls below the number of installed paths the limit no longer holds.\n\nReserve the shared quota before allocating a proxy path and release it on\nevery unsuccessful addition. Mesh and proxy paths now share one\n1024-entry budget, so mpp_path_add() can return -ENOSPC at that limit."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T12:55:53.953Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c66ab4b94bb04c162485759196555e08c0965320"
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        {
          "url": "https://git.kernel.org/stable/c/df072db65fdaa34ad15e1d66fc06a53e3e97f778"
        },
        {
          "url": "https://git.kernel.org/stable/c/3b75831ceee76d32bb8e7ddd241904f92f9b5407"
        },
        {
          "url": "https://git.kernel.org/stable/c/5a32409ed34a1868830899a5d2437f0b3bf3532c"
        },
        {
          "url": "https://git.kernel.org/stable/c/a5f35d4b112af1415ff06bd501c8cc26cc08aa8b"
        }
      ],
      "title": "wifi: mac80211: account proxy paths against the mesh path limit",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98705",
    "datePublished": "2026-10-18T15:46:35.520Z",
    "dateReserved": "2026-09-25T10:25:14.365Z",
    "dateUpdated": "2026-10-21T12:55:53.953Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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