CVE-2026-64092 (GCVE-0-2026-64092)
Vulnerability from cvelistv5
Published
2026-07-19 15:40
Modified
2026-07-19 15:40
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: batman-adv: tp_meter: fix tp_vars reference leak in receiver shutdown The receiver shutdown timer handler, batadv_tp_receiver_shutdown(), is responsible for releasing the tp_vars reference it holds. However, the existing logic for coordinating this release with batadv_tp_stop_all() was flawed. timer_shutdown_sync() guarantees the timer will not fire again after it returns, but it returns non-zero only when the timer was pending at the time of the call. If the timer had already expired (and batadv_tp_stop_all() would unsucessfully try to rearm itself), batadv_tp_stop_all() skips its batadv_tp_vars_put(), and batadv_tp_receiver_shutdown() fails to put its own reference as well. Fix this by introducing a new atomic variable receiving that is set to 1 when the receiver is initialized and cleared atomically with atomic_xchg() by whichever side claims it first. Only the side that observes the transition from 1 to 0 is responsible for releasing the tp_vars timer reference, eliminating the uncertainty.
References
Impacted products
Vendor Product Version
Linux Linux Version: 268078acae72daa12b17b2b299701cb9924e469a
Version: 58943b7ea356294749dae3e75b96c0ee292c00be
Version: 79bc0eaeef2c5797317bf2da8e3159a74d62ec47
Version: 26dfeee8db81354bfdade155f27f9e16510ad196
Version: 03660dab86f93319178a24667f6998526dc4355d
Version: 8634c1dbd73adb74d40533ebb7e914efb82e71fb
Version: 3d3cf6a7314aca4df0a6dde28ce784a2a30d0166
Version: 5e7d0ac936354c36810e74ac3056b334ed1f4058
Version: 5.10.259   ≤
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   Linux Linux Version: 6.6.140   ≤
Version: 6.12.90   ≤
Version: 6.18.32   ≤
Version: 7.0.9   ≤
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{
  "containers": {
    "cna": {
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          "defaultStatus": "unaffected",
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          "programFiles": [
            "net/batman-adv/tp_meter.c",
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      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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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\nbatman-adv: tp_meter: fix tp_vars reference leak in receiver shutdown\n\nThe receiver shutdown timer handler, batadv_tp_receiver_shutdown(), is\nresponsible for releasing the tp_vars reference it holds. However, the\nexisting logic for coordinating this release with batadv_tp_stop_all() was\nflawed.\n\ntimer_shutdown_sync() guarantees the timer will not fire again after it\nreturns, but it returns non-zero only when the timer was pending at the\ntime of the call. If the timer had already expired (and\nbatadv_tp_stop_all() would unsucessfully try to  rearm itself),\nbatadv_tp_stop_all() skips its batadv_tp_vars_put(), and\nbatadv_tp_receiver_shutdown() fails to put its own reference as well.\n\nFix this by introducing a new atomic variable receiving that is set to 1\nwhen the receiver is initialized and cleared atomically with atomic_xchg()\nby whichever side claims it first. Only the side that observes the\ntransition from 1 to 0 is responsible for releasing the tp_vars timer\nreference, eliminating the uncertainty."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-19T15:40:00.603Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/7715c73f33260af724d734c41b794457e9be8dbc"
        },
        {
          "url": "https://git.kernel.org/stable/c/297e1bc4a915b7cd3e65a79ed906b23fb3d7aaae"
        },
        {
          "url": "https://git.kernel.org/stable/c/0b1bedf114ea93fef929b31f0d70a9eedcc601de"
        },
        {
          "url": "https://git.kernel.org/stable/c/a9f0bfd624ee8a286d6fd2bf0f796e730efb49b0"
        },
        {
          "url": "https://git.kernel.org/stable/c/b285bc0a97f43823a4967fb6d286de4c7f53d541"
        },
        {
          "url": "https://git.kernel.org/stable/c/d078501dde9b57210f1808cdef4b59463d1f5fc8"
        },
        {
          "url": "https://git.kernel.org/stable/c/77098e4bea37af51d3962efa88a5af2ea5e1ac57"
        }
      ],
      "title": "batman-adv: tp_meter: fix tp_vars reference leak in receiver shutdown",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64092",
    "datePublished": "2026-07-19T15:40:00.603Z",
    "dateReserved": "2026-07-19T07:54:57.032Z",
    "dateUpdated": "2026-07-19T15:40:00.603Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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