CVE-2026-93204 (GCVE-0-2026-93204)
Vulnerability from cvelistv5
Published
2026-09-17 16:12
Modified
2026-10-19 09:07
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: batman-adv: dat: atomically update mac addresses When a MAC address is updated in batadv_dat_entry_add(), it is done using a simple copy function. A parallel reader might only see parts of this update. In worst case, the reader is transporting the half updated MAC address over the network or is creating an ARP response using it - poisoning the ARP cache. atomic64_t can be used to store the 48 bit of a mac address. A reader will then either see the old mac address or the new one - never a mixture of both.
References
Impacted products
Vendor Product Version
Linux Linux Version: 2f1dfbe185075a50dc8f0490a136377af53a1c62
Version: 2f1dfbe185075a50dc8f0490a136377af53a1c62
Version: 2f1dfbe185075a50dc8f0490a136377af53a1c62
Version: 2f1dfbe185075a50dc8f0490a136377af53a1c62
Version: 2f1dfbe185075a50dc8f0490a136377af53a1c62
Version: 2f1dfbe185075a50dc8f0490a136377af53a1c62
Version: 2f1dfbe185075a50dc8f0490a136377af53a1c62
Version: 2f1dfbe185075a50dc8f0490a136377af53a1c62
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{
  "containers": {
    "cna": {
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          "programFiles": [
            "net/batman-adv/distributed-arp-table.c",
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          "vendor": "Linux",
          "versions": [
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            },
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              "version": "0",
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              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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          "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: dat: atomically update mac addresses\n\nWhen a MAC address is updated in batadv_dat_entry_add(), it is done using a\nsimple copy function. A parallel reader might only see parts of this\nupdate. In worst case, the reader is transporting the half updated MAC\naddress over the network or is creating an ARP response using it -\npoisoning the ARP cache.\n\natomic64_t can be used to store the 48 bit of a mac address. A reader will\nthen either see the old mac address or the new one - never a mixture of\nboth."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:07:16.519Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/181012b3d29c51197c235ee5871fc7512c736855"
        },
        {
          "url": "https://git.kernel.org/stable/c/159360a0de831845c4500b4f8638decdcd624040"
        },
        {
          "url": "https://git.kernel.org/stable/c/259db2c04586d40b82c5c3002b1e28b0698a0bb7"
        },
        {
          "url": "https://git.kernel.org/stable/c/1674855a5b6eacfe35f4db3095d7055c25467274"
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        {
          "url": "https://git.kernel.org/stable/c/66238e2a74eca5dabf85b0cd2c3c944e474dc2fd"
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        {
          "url": "https://git.kernel.org/stable/c/a5e4d6cb4f6848b8906c1c493f99a8ccc0638515"
        },
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          "url": "https://git.kernel.org/stable/c/f68038c77a2f38c09c7e2e4f7fa1f4e246fdf2c9"
        },
        {
          "url": "https://git.kernel.org/stable/c/e6de568d3eda3e3c01c868fabd7a9535d5ee4a73"
        }
      ],
      "title": "batman-adv: dat: atomically update mac addresses",
      "x_generator": {
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      }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93204",
    "datePublished": "2026-09-17T16:12:24.403Z",
    "dateReserved": "2026-09-17T16:02:15.093Z",
    "dateUpdated": "2026-10-19T09:07:16.519Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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