CVE-2025-38588 (GCVE-0-2025-38588)
Vulnerability from cvelistv5
Published
2025-08-19 17:03
Modified
2025-08-19 17:03
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ipv6: prevent infinite loop in rt6_nlmsg_size() While testing prior patch, I was able to trigger an infinite loop in rt6_nlmsg_size() in the following place: list_for_each_entry_rcu(sibling, &f6i->fib6_siblings, fib6_siblings) { rt6_nh_nlmsg_size(sibling->fib6_nh, &nexthop_len); } This is because fib6_del_route() and fib6_add_rt2node() uses list_del_rcu(), which can confuse rcu readers, because they might no longer see the head of the list. Restart the loop if f6i->fib6_nsiblings is zero.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3c13db3e47e170bab19e574404e7b6be45ea873d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/46aeb66e9e54ed0d56c18615e1c3dbd502b327ab
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/54e6fe9dd3b0e7c481c2228782c9494d653546da
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6d345136c9b875f065d226908a29c25cdf9343f8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cd8d8bbd9ced4cc5d06d858f67d4aa87745e8f38
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e1b7932af47f92432be8303d2439d1bf77b0be23
Impacted products
Vendor Product Version
Linux Linux Version: d0ec61c9f3583b76aebdbb271f5c0d3fcccd48b2
Version: 52da02521ede55fb86546c3fffd9377b3261b91f
Version: 34a949e7a0869dfa31a40416d2a56973fae1807b
Version: d9ccb18f83ea2bb654289b6ecf014fd267cc988b
Version: d9ccb18f83ea2bb654289b6ecf014fd267cc988b
Version: d9ccb18f83ea2bb654289b6ecf014fd267cc988b
Version: 11edcd026012ac18acee0f1514db3ed1b160fc6f
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   Linux Linux Version: 6.13
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{
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/ip6_fib.c",
            "net/ipv6/route.c"
          ],
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        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/ip6_fib.c",
            "net/ipv6/route.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "6.13"
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              "lessThan": "6.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.148",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.102",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.42",
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            },
            {
              "lessThanOrEqual": "6.15.*",
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              "version": "6.15.10",
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            },
            {
              "lessThanOrEqual": "6.16.*",
              "status": "unaffected",
              "version": "6.16.1",
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            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.17-rc1",
              "versionType": "original_commit_for_fix"
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          ]
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      ],
      "cpeApplicability": [
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          "nodes": [
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: prevent infinite loop in rt6_nlmsg_size()\n\nWhile testing prior patch, I was able to trigger\nan infinite loop in rt6_nlmsg_size() in the following place:\n\nlist_for_each_entry_rcu(sibling, \u0026f6i-\u003efib6_siblings,\n\t\t\tfib6_siblings) {\n\trt6_nh_nlmsg_size(sibling-\u003efib6_nh, \u0026nexthop_len);\n}\n\nThis is because fib6_del_route() and fib6_add_rt2node()\nuses list_del_rcu(), which can confuse rcu readers,\nbecause they might no longer see the head of the list.\n\nRestart the loop if f6i-\u003efib6_nsiblings is zero."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-08-19T17:03:09.856Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/6d345136c9b875f065d226908a29c25cdf9343f8"
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          "url": "https://git.kernel.org/stable/c/cd8d8bbd9ced4cc5d06d858f67d4aa87745e8f38"
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        {
          "url": "https://git.kernel.org/stable/c/54e6fe9dd3b0e7c481c2228782c9494d653546da"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38588",
    "datePublished": "2025-08-19T17:03:09.856Z",
    "dateReserved": "2025-04-16T04:51:24.026Z",
    "dateUpdated": "2025-08-19T17:03:09.856Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38588\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-08-19T17:15:36.383\",\"lastModified\":\"2025-08-20T14:40:17.713\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nipv6: prevent infinite loop in rt6_nlmsg_size()\\n\\nWhile testing prior patch, I was able to trigger\\nan infinite loop in rt6_nlmsg_size() in the following place:\\n\\nlist_for_each_entry_rcu(sibling, \u0026f6i-\u003efib6_siblings,\\n\\t\\t\\tfib6_siblings) {\\n\\trt6_nh_nlmsg_size(sibling-\u003efib6_nh, \u0026nexthop_len);\\n}\\n\\nThis is because fib6_del_route() and fib6_add_rt2node()\\nuses list_del_rcu(), which can confuse rcu readers,\\nbecause they might no longer see the head of the list.\\n\\nRestart the loop if f6i-\u003efib6_nsiblings is zero.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ipv6: evitar bucle infinito en rt6_nlmsg_size(). Durante las pruebas del parche anterior, logr\u00e9 activar un bucle infinito en rt6_nlmsg_size() en el siguiente lugar: list_for_each_entry_rcu(sibling, \u0026amp;f6i-\u0026gt;fib6_siblings, fib6_siblings) { rt6_nh_nlmsg_size(sibling-\u0026gt;fib6_nh, \u0026amp;nexthop_len); }. Esto se debe a que fib6_del_route() y fib6_add_rt2node() usan list_del_rcu(), lo que puede confundir a los lectores de rcu, ya que podr\u00edan dejar de ver el encabezado de la lista. Reinicie el bucle si f6i-\u0026gt;fib6_nsiblings es cero.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3c13db3e47e170bab19e574404e7b6be45ea873d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/46aeb66e9e54ed0d56c18615e1c3dbd502b327ab\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/54e6fe9dd3b0e7c481c2228782c9494d653546da\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6d345136c9b875f065d226908a29c25cdf9343f8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cd8d8bbd9ced4cc5d06d858f67d4aa87745e8f38\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e1b7932af47f92432be8303d2439d1bf77b0be23\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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