CVE-2026-46233 (GCVE-0-2026-46233)
Vulnerability from cvelistv5
Published
2026-05-28 09:40
Modified
2026-06-14 18:04
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: batman-adv: bla: only purge non-released claims When batadv_bla_purge_claims() goes through the list of claims, it is only traversing the hash list with an rcu_read_lock(). Due to a potential parallel batadv_claim_put(), it can happen that it encounters a claim which was actually in the process of being released+freed by batadv_claim_release(). In this case, backbone_gw is set to NULL before the delayed RCU kfree is started. Calling batadv_bla_claim_get_backbone_gw() is then no longer allowed because it would cause a NULL-ptr derefence. To avoid this, only claims with a valid reference counter must be purged. All others are already taken care of.
Impacted products
Vendor Product Version
Linux Linux Version: 23721387c409087fd3b97e274f34d3ddc0970b74
Version: 23721387c409087fd3b97e274f34d3ddc0970b74
Version: 23721387c409087fd3b97e274f34d3ddc0970b74
Version: 23721387c409087fd3b97e274f34d3ddc0970b74
Version: 23721387c409087fd3b97e274f34d3ddc0970b74
Version: 23721387c409087fd3b97e274f34d3ddc0970b74
Version: 23721387c409087fd3b97e274f34d3ddc0970b74
Version: 23721387c409087fd3b97e274f34d3ddc0970b74
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      "cpeApplicability": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: bla: only purge non-released claims\n\nWhen batadv_bla_purge_claims() goes through the list of claims, it is only\ntraversing the hash list with an rcu_read_lock(). Due to a potential\nparallel batadv_claim_put(), it can happen that it encounters a claim which\nwas actually in the process of being released+freed by\nbatadv_claim_release(). In this case, backbone_gw is set to NULL before the\ndelayed RCU kfree is started. Calling batadv_bla_claim_get_backbone_gw() is\nthen no longer allowed because it would cause a NULL-ptr derefence.\n\nTo avoid this, only claims with a valid reference counter must be purged.\nAll others are already taken care of."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-14T18:04:36.157Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a9f58d5e3261f3deeae69ec1e237f38ef3ff5cbe"
        },
        {
          "url": "https://git.kernel.org/stable/c/6725c523a35eeca611ff37e7d4a8712fae92aefd"
        },
        {
          "url": "https://git.kernel.org/stable/c/afb5436f6028fd68f408f189230fbaa19c910d72"
        },
        {
          "url": "https://git.kernel.org/stable/c/7b8fbcee3184d848b5aee085ca16d0cf05c9b641"
        },
        {
          "url": "https://git.kernel.org/stable/c/7b7ebb7222a5524ce58e48cc9c6d688320ea6cfe"
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          "url": "https://git.kernel.org/stable/c/b65365d2b1e6095c538d49baeb140dd1c166c1b3"
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        {
          "url": "https://git.kernel.org/stable/c/ab3dbd07a809a8eb30c7ddfab9ac886ed30dce8d"
        },
        {
          "url": "https://git.kernel.org/stable/c/cf6b604011591865ae39ac82de8978c1120d17af"
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      ],
      "title": "batman-adv: bla: only purge non-released claims",
      "x_generator": {
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46233",
    "datePublished": "2026-05-28T09:40:55.019Z",
    "dateReserved": "2026-05-13T15:03:33.106Z",
    "dateUpdated": "2026-06-14T18:04:36.157Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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