ghsa-xmch-89f7-f57m
Vulnerability from github
Published
2025-08-19 18:31
Modified
2025-11-03 18:31
Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-38588"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-08-19T17:15:36Z",
    "severity": null
  },
  "details": "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.",
  "id": "GHSA-xmch-89f7-f57m",
  "modified": "2025-11-03T18:31:34Z",
  "published": "2025-08-19T18:31:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38588"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3c13db3e47e170bab19e574404e7b6be45ea873d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/46aeb66e9e54ed0d56c18615e1c3dbd502b327ab"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/54e6fe9dd3b0e7c481c2228782c9494d653546da"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6d345136c9b875f065d226908a29c25cdf9343f8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cd8d8bbd9ced4cc5d06d858f67d4aa87745e8f38"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e1b7932af47f92432be8303d2439d1bf77b0be23"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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