CVE-2026-63834 (GCVE-0-2026-63834)
Vulnerability from cvelistv5
Published
2026-07-19 12:02
Modified
2026-08-17 04:51
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: batman-adv: tp_meter: restrict number of unacked list entries When the unacked_list is unbound, an attacker could send messages with small lengths and appropriated seqno + gaps to force the receiver to allocate more and more unacked_list entries. And the end either causing an out-of-memory situation or increase the management overhead for the (large) list that significant portions of CPU cycles are wasted in searching through the list. When limiting the list to a specific number, it is important to still correctly add a new entry to the list. But if the list became larger than the limit, the last entry of the list (with the highest seqno) must be dropped to still allow the earlier seqnos to finish and therefore to continue the process. Otherwise, the process might get stuck with too high seqnos which are not handled by batadv_tp_ack_unordered().
References
Impacted products
Vendor Product Version
Linux Linux Version: 33a3bb4a3345bb511f9c69c913da95d4693e2a4e
Version: 33a3bb4a3345bb511f9c69c913da95d4693e2a4e
Version: 33a3bb4a3345bb511f9c69c913da95d4693e2a4e
Version: 33a3bb4a3345bb511f9c69c913da95d4693e2a4e
Version: 33a3bb4a3345bb511f9c69c913da95d4693e2a4e
Version: 33a3bb4a3345bb511f9c69c913da95d4693e2a4e
Version: 33a3bb4a3345bb511f9c69c913da95d4693e2a4e
Version: 33a3bb4a3345bb511f9c69c913da95d4693e2a4e
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/batman-adv/tp_meter.c",
            "net/batman-adv/types.h"
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          "vendor": "Linux",
          "versions": [
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            },
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              "version": "0",
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            },
            {
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              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
        {
          "nodes": [
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: tp_meter: restrict number of unacked list entries\n\nWhen the unacked_list is unbound, an attacker could send messages with\nsmall lengths and appropriated seqno + gaps to force the receiver to\nallocate more and more unacked_list entries. And the end either causing an\nout-of-memory situation or increase the management overhead for the (large)\nlist that significant portions of CPU cycles are wasted in searching\nthrough the list.\n\nWhen limiting the list to a specific number, it is important to still\ncorrectly add a new entry to the list. But if the list became larger than\nthe limit, the last entry of the list (with the highest seqno) must be\ndropped to still allow the earlier seqnos to finish and therefore to\ncontinue the process. Otherwise, the process might get stuck with too high\nseqnos which are not handled by batadv_tp_ack_unordered()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T04:51:44.393Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/31a88792bfba142be3c9521538c1db805677381f"
        },
        {
          "url": "https://git.kernel.org/stable/c/1111a3381bca2d1f084a07686bc783af5ab23df7"
        },
        {
          "url": "https://git.kernel.org/stable/c/1c616b0be4bd8399d485e25e91859373b95d6013"
        },
        {
          "url": "https://git.kernel.org/stable/c/f8c499fd275e59203b77fca76ae6ef2d096c2133"
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        {
          "url": "https://git.kernel.org/stable/c/c6231d628d06d841bc1617b2f7034f5f39876b16"
        },
        {
          "url": "https://git.kernel.org/stable/c/2233787658db859f0a9b83cb397cf783bb8be865"
        },
        {
          "url": "https://git.kernel.org/stable/c/1fb8762600a393d1caccd63be5d07e1756982d68"
        },
        {
          "url": "https://git.kernel.org/stable/c/e7c775110e1858e5a7471a23a9c9658c0af9df89"
        }
      ],
      "title": "batman-adv: tp_meter: restrict number of unacked list entries",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-63834",
    "datePublished": "2026-07-19T12:02:26.045Z",
    "dateReserved": "2026-07-19T07:54:57.015Z",
    "dateUpdated": "2026-08-17T04:51:44.393Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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