FKIE_CVE-2026-64092

Vulnerability from fkie_nvd - Published: 2026-07-19 16:17 - Updated: 2026-07-19 16:17
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0b1bedf114ea93fef929b31f0d70a9eedcc601de
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/297e1bc4a915b7cd3e65a79ed906b23fb3d7aaae
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/77098e4bea37af51d3962efa88a5af2ea5e1ac57
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7715c73f33260af724d734c41b794457e9be8dbc
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a9f0bfd624ee8a286d6fd2bf0f796e730efb49b0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b285bc0a97f43823a4967fb6d286de4c7f53d541
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d078501dde9b57210f1808cdef4b59463d1f5fc8
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/batman-adv/tp_meter.c",
            "net/batman-adv/types.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "7715c73f33260af724d734c41b794457e9be8dbc",
              "status": "affected",
              "version": "268078acae72daa12b17b2b299701cb9924e469a",
              "versionType": "git"
            },
            {
              "lessThan": "297e1bc4a915b7cd3e65a79ed906b23fb3d7aaae",
              "status": "affected",
              "version": "58943b7ea356294749dae3e75b96c0ee292c00be",
              "versionType": "git"
            },
            {
              "lessThan": "0b1bedf114ea93fef929b31f0d70a9eedcc601de",
              "status": "affected",
              "version": "79bc0eaeef2c5797317bf2da8e3159a74d62ec47",
              "versionType": "git"
            },
            {
              "lessThan": "a9f0bfd624ee8a286d6fd2bf0f796e730efb49b0",
              "status": "affected",
              "version": "26dfeee8db81354bfdade155f27f9e16510ad196",
              "versionType": "git"
            },
            {
              "lessThan": "b285bc0a97f43823a4967fb6d286de4c7f53d541",
              "status": "affected",
              "version": "03660dab86f93319178a24667f6998526dc4355d",
              "versionType": "git"
            },
            {
              "lessThan": "d078501dde9b57210f1808cdef4b59463d1f5fc8",
              "status": "affected",
              "version": "8634c1dbd73adb74d40533ebb7e914efb82e71fb",
              "versionType": "git"
            },
            {
              "lessThan": "77098e4bea37af51d3962efa88a5af2ea5e1ac57",
              "status": "affected",
              "version": "3d3cf6a7314aca4df0a6dde28ce784a2a30d0166",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "5e7d0ac936354c36810e74ac3056b334ed1f4058",
              "versionType": "git"
            },
            {
              "lessThan": "5.11",
              "status": "affected",
              "version": "5.10.259",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/batman-adv/tp_meter.c",
            "net/batman-adv/types.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6.6.142",
              "status": "affected",
              "version": "6.6.140",
              "versionType": "semver"
            },
            {
              "lessThan": "6.12.92",
              "status": "affected",
              "version": "6.12.90",
              "versionType": "semver"
            },
            {
              "lessThan": "6.18.34",
              "status": "affected",
              "version": "6.18.32",
              "versionType": "semver"
            },
            {
              "lessThan": "7.0.11",
              "status": "affected",
              "version": "7.0.9",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2026-64092",
  "lastModified": "2026-07-19T16:17:50.110",
  "metrics": {},
  "published": "2026-07-19T16:17:50.110",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0b1bedf114ea93fef929b31f0d70a9eedcc601de"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/297e1bc4a915b7cd3e65a79ed906b23fb3d7aaae"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/77098e4bea37af51d3962efa88a5af2ea5e1ac57"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7715c73f33260af724d734c41b794457e9be8dbc"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a9f0bfd624ee8a286d6fd2bf0f796e730efb49b0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b285bc0a97f43823a4967fb6d286de4c7f53d541"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d078501dde9b57210f1808cdef4b59463d1f5fc8"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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