CVE-2025-21768 (GCVE-0-2025-21768)
Vulnerability from cvelistv5
Published
2025-02-27 02:18
Modified
2025-05-04 07:20
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net: ipv6: fix dst ref loops in rpl, seg6 and ioam6 lwtunnels Some lwtunnels have a dst cache for post-transformation dst. If the packet destination did not change we may end up recording a reference to the lwtunnel in its own cache, and the lwtunnel state will never be freed. Discovered by the ioam6.sh test, kmemleak was recently fixed to catch per-cpu memory leaks. I'm not sure if rpl and seg6 can actually hit this, but in principle I don't see why not.
References
Impacted products
Vendor Product Version
Linux Linux Version: 6c8702c60b88651072460f3f4026c7dfe2521d12
Version: 6c8702c60b88651072460f3f4026c7dfe2521d12
Version: 6c8702c60b88651072460f3f4026c7dfe2521d12
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/ioam6_iptunnel.c",
            "net/ipv6/rpl_iptunnel.c",
            "net/ipv6/seg6_iptunnel.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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          "programFiles": [
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            "net/ipv6/seg6_iptunnel.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
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              "version": "4.10"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "lessThanOrEqual": "6.12.*",
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              "version": "6.13.4",
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              "versionType": "original_commit_for_fix"
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                  "versionEndExcluding": "6.13.4",
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                  "versionEndExcluding": "6.14",
                  "versionStartIncluding": "4.10",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
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          ]
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ipv6: fix dst ref loops in rpl, seg6 and ioam6 lwtunnels\n\nSome lwtunnels have a dst cache for post-transformation dst.\nIf the packet destination did not change we may end up recording\na reference to the lwtunnel in its own cache, and the lwtunnel\nstate will never be freed.\n\nDiscovered by the ioam6.sh test, kmemleak was recently fixed\nto catch per-cpu memory leaks. I\u0027m not sure if rpl and seg6\ncan actually hit this, but in principle I don\u0027t see why not."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T07:20:42.186Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/5ab11a4e219e93b8b31a27f8ec98d42afadd8b7a"
        },
        {
          "url": "https://git.kernel.org/stable/c/4c0f200c7d06fedddde82209c099014d63f4a6c0"
        },
        {
          "url": "https://git.kernel.org/stable/c/92191dd1073088753821b862b791dcc83e558e07"
        }
      ],
      "title": "net: ipv6: fix dst ref loops in rpl, seg6 and ioam6 lwtunnels",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-21768",
    "datePublished": "2025-02-27T02:18:17.553Z",
    "dateReserved": "2024-12-29T08:45:45.762Z",
    "dateUpdated": "2025-05-04T07:20:42.186Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-21768\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-02-27T03:15:17.480\",\"lastModified\":\"2025-02-27T03:15:17.480\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: ipv6: fix dst ref loops in rpl, seg6 and ioam6 lwtunnels\\n\\nSome lwtunnels have a dst cache for post-transformation dst.\\nIf the packet destination did not change we may end up recording\\na reference to the lwtunnel in its own cache, and the lwtunnel\\nstate will never be freed.\\n\\nDiscovered by the ioam6.sh test, kmemleak was recently fixed\\nto catch per-cpu memory leaks. I\u0027m not sure if rpl and seg6\\ncan actually hit this, but in principle I don\u0027t see why not.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: ipv6: arreglo de bucles de referencia dst en lwtunnels rpl, seg6 y ioam6 Algunos lwtunnels tienen una cach\u00e9 dst para dst posterior a la transformaci\u00f3n. Si el destino del paquete no cambi\u00f3, podemos terminar registrando una referencia al lwtunnel en su propia cach\u00e9, y el estado del lwtunnel nunca se liberar\u00e1. Descubierto por la prueba ioam6.sh, kmemleak se corrigi\u00f3 recientemente para detectar fugas de memoria por CPU. No estoy seguro de si rpl y seg6 realmente pueden alcanzar esto, pero en principio no veo por qu\u00e9 no.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/4c0f200c7d06fedddde82209c099014d63f4a6c0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5ab11a4e219e93b8b31a27f8ec98d42afadd8b7a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/92191dd1073088753821b862b791dcc83e558e07\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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