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CVE-2023-52986

Estado: AnalizadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

bpf, sockmap: Check for any of tcp_bpf_prots when cloning a listener

A listening socket linked to a sockmap has its sk_prot overridden. It points to one of the struct proto variants in tcp_bpf_prots. The variant depends on the socket's family and which sockmap programs are attached.

A child socket cloned from a TCP listener initially inherits their sk_prot. But before cloning is finished, we restore the child's proto to the listener's original non-tcp_bpf_prots one. This happens in tcp_create_openreq_child -> tcp_bpf_clone.

Today, in tcp_bpf_clone we detect if the child's proto should be restored by checking only for the TCP_BPF_BASE proto variant. This is not correct. The sk_prot of listening socket linked to a sockmap can point to to any variant in tcp_bpf_prots.

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If the listeners sk_prot happens to be not the TCP_BPF_BASE variant, then the child socket unintentionally is left if the inherited sk_prot by tcp_bpf_clone.

This leads to issues like infinite recursion on close [1], because the child state is otherwise not set up for use with tcp_bpf_prot operations.

Adjust the check in tcp_bpf_clone to detect all of tcp_bpf_prots variants.

Note that it wouldn't be sufficient to check the socket state when overriding the sk_prot in tcp_bpf_update_proto in order to always use the TCP_BPF_BASE variant for listening sockets. Since commit b8b8315e39ff ("bpf, sockmap: Remove unhash handler for BPF sockmap usage") it is possible for a socket to transition to TCP_LISTEN state while already linked to a sockmap, e.g. connect() -> insert into map -> connect(AF_UNSPEC) -> listen().

[1]: https://lore.kernel.org/all/00000000000073b14905ef2e7401@google.com/

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2023-52986",
  "cveTags": [],
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        "source": "nvd@nist.gov",
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          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, sockmap: Check for any of tcp_bpf_prots when cloning a listener\n\nA listening socket linked to a sockmap has its sk_prot overridden. It\npoints to one of the struct proto variants in tcp_bpf_prots. The variant\ndepends on the socket's family and which sockmap programs are attached.\n\nA child socket cloned from a TCP listener initially inherits their sk_prot.\nBut before cloning is finished, we restore the child's proto to the\nlistener's original non-tcp_bpf_prots one. This happens in\ntcp_create_openreq_child -> tcp_bpf_clone.\n\nToday, in tcp_bpf_clone we detect if the child's proto should be restored\nby checking only for the TCP_BPF_BASE proto variant. This is not\ncorrect. The sk_prot of listening socket linked to a sockmap can point to\nto any variant in tcp_bpf_prots.\n\nIf the listeners sk_prot happens to be not the TCP_BPF_BASE variant, then\nthe child socket unintentionally is left if the inherited sk_prot by\ntcp_bpf_clone.\n\nThis leads to issues like infinite recursion on close [1], because the\nchild state is otherwise not set up for use with tcp_bpf_prot operations.\n\nAdjust the check in tcp_bpf_clone to detect all of tcp_bpf_prots variants.\n\nNote that it wouldn't be sufficient to check the socket state when\noverriding the sk_prot in tcp_bpf_update_proto in order to always use the\nTCP_BPF_BASE variant for listening sockets. Since commit\nb8b8315e39ff (\"bpf, sockmap: Remove unhash handler for BPF sockmap usage\")\nit is possible for a socket to transition to TCP_LISTEN state while already\nlinked to a sockmap, e.g. connect() -> insert into map ->\nconnect(AF_UNSPEC) -> listen().\n\n[1]: https://lore.kernel.org/all/00000000000073b14905ef2e7401@google.com/"
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      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf, sockmap: Comprueba si hay algún tcp_bpf_prots al clonar un oyente Un socket que escucha vinculado a un sockmap tiene su sk_prot anulado. Apunta a una de las variantes de struct proto en tcp_bpf_prots. La variante depende de la familia del socket y de los programas sockmap que estén adjuntos. Un socket hijo clonado de un oyente TCP hereda inicialmente su sk_prot. Pero antes de que finalice la clonación, restauramos el proto del hijo al original del oyente que no es tcp_bpf_prots. Esto sucede en tcp_create_openreq_child -> tcp_bpf_clone. Hoy, en tcp_bpf_clone detectamos si el proto del hijo debe restaurarse comprobando solo la variante del proto TCP_BPF_BASE. Esto no es correcto. El sk_prot del socket de escucha vinculado a un mapa de socks puede apuntar a cualquier variante de tcp_bpf_prots. Si el sk_prot del socket de escucha no es la variante TCP_BPF_BASE, el socket hijo se abandona involuntariamente si el sk_prot heredado por tcp_bpf_clone lo impide. Esto genera problemas como la recursión infinita al cerrar [1], ya que el estado del hijo no está configurado para su uso con operaciones de tcp_bpf_prot. Ajuste la comprobación en tcp_bpf_clone para detectar todas las variantes de tcp_bpf_prots. Tenga en cuenta que no sería suficiente comprobar el estado del socket al sobrescribir el sk_prot en tcp_bpf_update_proto para usar siempre la variante TCP_BPF_BASE para los sockets de escucha. Desde el commit b8b8315e39ff (\"bpf, sockmap: eliminar el controlador unhash para el uso de sockmap BPF\"), es posible que un socket pase al estado TCP_LISTEN mientras ya está vinculado a un sockmap, por ejemplo, connect() -> insert into map -> connect(AF_UNSPEC) -> listen(). [1]: https://lore.kernel.org/all/00000000000073b14905ef2e7401@google.com/"
    }
  ],
  "lastModified": "2026-06-17T06:44:03.587",
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