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HighFix available

batman-adv: tvlv: reject oversized TVLV packets

Type: advisorySources: OSV

In the Linux kernel, the following vulnerability has been resolved: batman-adv: tvlv: reject oversized TVLV packets batadv_tvlv_container_ogm_append() builds a TVLV packet section from the tvlv.container_list. The total size of this section is computed by batadv_tvlv_container_list_size(), which sums the sizes of all registered containers. The return type and accumulator in batadv_tvlv_container_list_size() were u16. If the accumulated size exceeds U16_MAX, the value wraps around, causing the subsequent allocation in batadv_tvlv_container_ogm_append() to be undersized. The memcpy-style copy that follows would then write beyond the end of the allocated buffer, corrupting kernel memory. Fix this by widening the return type of batadv_tvlv_container_list_size() to size_t. In batadv_tvlv_container_ogm_append(), check the computed length against U16_MAX before proceeding, and bail out as if the allocation had failed when the limit is exceeded.

Products
Kernel
Affected versions
Not specified
Fixed versions
5.10.259, 5.15.210, 6.1.176, 6.12.93, 6.18.34, 6.6.143, 7.0.11
CVEs
CVE-2026-52934
Confirmed fixed CVEs
Not specified
Updated in this feed
5 Nov 2026, 04:16 UTC · Revision 1

Source evidence

batman-adv: tvlv: reject oversized TVLV packets

core-osv · Original source

Published 24 Jun 2026, 07:14 UTC

In the Linux kernel, the following vulnerability has been resolved: batman-adv: tvlv: reject oversized TVLV packets batadv_tvlv_container_ogm_append() builds a TVLV packet section from the tvlv.container_list. The total size of this section is computed by batadv_tvlv_container_list_size(), which sums the sizes of all registered containers. The return type and accumulator in batadv_tvlv_container_list_size() were u16. If the accumulated size exceeds U16_MAX, the value wraps around, causing the subsequent allocation in batadv_tvlv_container_ogm_append() to be undersized. The memcpy-style copy that follows would then write beyond the end of the allocated buffer, corrupting kernel memory. Fix this by widening the return type of batadv_tvlv_container_list_size() to size_t. In batadv_tvlv_container_ogm_append(), check the computed length against U16_MAX before proceeding, and bail out as if the allocation had failed when the limit is exceeded.

osv:CVE-2026-52934

Kernel

Fixed versions: 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.93, 6.18.34, 7.0.11

Complete source record
{
  "id": "340e6a0166be090b04f12c03856dafee39f2e88c68b33228dc8b33986d1ddbd4",
  "url": "https://osv.dev/vulnerability/CVE-2026-52934",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "batman-adv: tvlv: reject oversized TVLV packets",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: batman-adv: tvlv: reject oversized TVLV packets batadv_tvlv_container_ogm_append() builds a TVLV packet section from the tvlv.container_list. The total size of this section is computed by batadv_tvlv_container_list_size(), which sums the sizes of all registered containers. The return type and accumulator in batadv_tvlv_container_list_size() were u16. If the accumulated size exceeds U16_MAX, the value wraps around, causing the subsequent allocation in batadv_tvlv_container_ogm_append() to be undersized. The memcpy-style copy that follows would then write beyond the end of the allocated buffer, corrupting kernel memory. Fix this by widening the return type of batadv_tvlv_container_list_size() to size_t. In batadv_tvlv_container_ogm_append(), check the computed length against U16_MAX before proceeding, and bail out as if the allocation had failed when the limit is exceeded.",
    "evidence": "osv:CVE-2026-52934",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.259",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.210",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.176",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.143",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.93",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.34",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.0.11",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-52934",
      "aliases": [
        "CVE-2026-52934"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                },
                {
                  "fixed": "1595628a2f877d052eda18865ccf539392c47c04"
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                {
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                {
                  "fixed": "f50487e3566358b2b982b7801945e858c78ad9ab"
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              ]
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-52934.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "3.13.0"
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                {
                  "fixed": "5.10.259"
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              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.210"
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              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.176"
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              ]
            },
            {
              "type": "ECOSYSTEM",
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                {
                  "introduced": "6.2.0"
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                  "fixed": "6.6.143"
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            },
            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "6.7.0"
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                {
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              ]
            },
            {
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              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.34"
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            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-52934.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:42.822504933Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/13493b00dd1e05a705981e052158652ea23eb482",
        "https://git.kernel.org/stable/c/1595628a2f877d052eda18865ccf539392c47c04",
        "https://git.kernel.org/stable/c/6448a49344e87487b61bd88cb850cd694a0f576d",
        "https://git.kernel.org/stable/c/94a3d72cd9b21116d7c6d5bdc57c11401fc28557",
        "https://git.kernel.org/stable/c/94db72e9dac202e017ee3db22c59d17e4f3bf171",
        "https://git.kernel.org/stable/c/c02aa6c0c9d1bea9bb75dea362b75ad225137bae",
        "https://git.kernel.org/stable/c/ede47988ac5687793745b17c1634a496a2299919",
        "https://git.kernel.org/stable/c/f50487e3566358b2b982b7801945e858c78ad9ab",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52934.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-52934",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52934.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-52934",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 510215,
  "published_at": "2026-06-24T07:14:25.321+00:00"
}