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CVE-2024-36883

Estado: ModificadaAlta (7.1)—

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: corrige el acceso fuera de los límites en ops_init net_alloc_generic es llamado por net_alloc, que se llama sin ningún bloqueo. Lee max_gen_ptrs, que se modifica en pernet_ops_rwsem. Se lee dos veces, primero para asignar una matriz y luego para configurar s.len, que luego se usa para limitar los límites del acceso a la matriz.

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Es posible que la matriz esté asignada y otro subproceso esté registrando nuevas operaciones de pernet, incrementa max_gen_ptrs, que luego se usa para configurar s.len con una longitud mayor que la asignada para la matriz de variables. Solucionelo leyendo max_gen_ptrs solo una vez en net_alloc_generic. Si max_gen_ptrs se incrementa posteriormente, quedará atrapado en net_assign_generic.

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 (2)

Debian — Debian LinuxLinux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: fix out-of-bounds access in ops_init\n\nnet_alloc_generic is called by net_alloc, which is called without any\nlocking. It reads max_gen_ptrs, which is changed under pernet_ops_rwsem. It\nis read twice, first to allocate an array, then to set s.len, which is\nlater used to limit the bounds of the array access.\n\nIt is possible that the array is allocated and another thread is\nregistering a new pernet ops, increments max_gen_ptrs, which is then used\nto set s.len with a larger than allocated length for the variable array.\n\nFix it by reading max_gen_ptrs only once in net_alloc_generic. If\nmax_gen_ptrs is later incremented, it will be caught in net_assign_generic."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: corrige el acceso fuera de los límites en ops_init net_alloc_generic es llamado por net_alloc, que se llama sin ningún bloqueo. Lee max_gen_ptrs, que se modifica en pernet_ops_rwsem. Se lee dos veces, primero para asignar una matriz y luego para configurar s.len, que luego se usa para limitar los límites del acceso a la matriz. Es posible que la matriz esté asignada y otro subproceso esté registrando nuevas operaciones de pernet, incrementa max_gen_ptrs, que luego se usa para configurar s.len con una longitud mayor que la asignada para la matriz de variables. Solucionelo leyendo max_gen_ptrs solo una vez en net_alloc_generic. Si max_gen_ptrs se incrementa posteriormente, quedará atrapado en net_assign_generic."
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