FKIE_CVE-2025-38588

Vulnerability from fkie_nvd - Published: 2025-08-19 17:15 - Updated: 2026-01-07 18:44
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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/3c13db3e47e170bab19e574404e7b6be45ea873dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/46aeb66e9e54ed0d56c18615e1c3dbd502b327abPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/54e6fe9dd3b0e7c481c2228782c9494d653546daPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6d345136c9b875f065d226908a29c25cdf9343f8Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cd8d8bbd9ced4cc5d06d858f67d4aa87745e8f38Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e1b7932af47f92432be8303d2439d1bf77b0be23Patch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlThird Party Advisory
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
debian debian_linux 11.0
To clipboard 

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      "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."
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      "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."
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  "id": "CVE-2025-38588",
  "lastModified": "2026-01-07T18:44:49.737",
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          "baseScore": 5.5,
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          "confidentialityImpact": "NONE",
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