CVE-2023-52986

{"id": "CVE-2023-52986", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "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"}, "impactScore": 3.6, "exploitabilityScore": 1.8}]}, "published": "2025-03-27T17:15:45.930", "references": [{"url": "https://git.kernel.org/stable/c/12b0ec7c6953e1602957926439e5297095d7d065", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/9bd6074e1872d22190a8da30e796cbf937d334f0", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/c681d7a4ed3d360de0574f4d6b7305a8de8dc54f", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/ddce1e091757d0259107c6c0c7262df201de2b66", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-674"}]}], "descriptions": [{"lang": "en", "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/"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf, sockmap: Comprueba si hay alg\u00fan 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 est\u00e9n adjuntos. Un socket hijo clonado de un oyente TCP hereda inicialmente su sk_prot. Pero antes de que finalice la clonaci\u00f3n, 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 recursi\u00f3n infinita al cerrar [1], ya que el estado del hijo no est\u00e1 configurado para su uso con operaciones de tcp_bpf_prot. Ajuste la comprobaci\u00f3n en tcp_bpf_clone para detectar todas las variantes de tcp_bpf_prots. Tenga en cuenta que no ser\u00eda 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 est\u00e1 vinculado a un sockmap, por ejemplo, connect() -> insert into map -> connect(AF_UNSPEC) -> listen(). [1]: https://lore.kernel.org/all/00000000000073b14905ef2e7401@google.com/"}], "lastModified": "2025-10-29T17:11:37.290", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "6FA3AC54-E905-4F24-9B0E-303D5FF0BBB5", "versionEndExcluding": "5.10.168", "versionStartIncluding": "5.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "98FAC10E-42A0-4372-B1A0-A49CF672890E", "versionEndExcluding": "5.15.93", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "535D03F4-DA02-49FE-934E-668827E6407B", "versionEndExcluding": "6.1.11", "versionStartIncluding": "5.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.2:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "FF501633-2F44-4913-A8EE-B021929F49F6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.2:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "2BDA597B-CAC1-4DF0-86F0-42E142C654E9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.2:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "725C78C9-12CE-406F-ABE8-0813A01D66E8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.2:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "A127C155-689C-4F67-B146-44A57F4BFD85"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.2:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D34127CC-68F5-4703-A5F6-5006F803E4AE"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.2:rc6:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4AB8D555-648E-4F2F-98BD-3E7F45BD12A8"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}