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CVE-2023-52932

Estado: ModificadaMedia (5.5)—

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

mm/swapfile: add cond_resched() in get_swap_pages()

The softlockup still occurs in get_swap_pages() under memory pressure. 64 CPU cores, 64GB memory, and 28 zram devices, the disksize of each zram device is 50MB with same priority as si. Use the stress-ng tool to increase memory pressure, causing the system to oom frequently.

The plist_for_each_entry_safe() loops in get_swap_pages() could reach tens of thousands of times to find available space (extreme case: cond_resched() is not called in scan_swap_map_slots()). Let's add cond_resched() into get_swap_pages() when failed to find available space to avoid softlockup.

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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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/swapfile: add cond_resched() in get_swap_pages()\n\nThe softlockup still occurs in get_swap_pages() under memory pressure.  64\nCPU cores, 64GB memory, and 28 zram devices, the disksize of each zram\ndevice is 50MB with same priority as si.  Use the stress-ng tool to\nincrease memory pressure, causing the system to oom frequently.\n\nThe plist_for_each_entry_safe() loops in get_swap_pages() could reach tens\nof thousands of times to find available space (extreme case:\ncond_resched() is not called in scan_swap_map_slots()).  Let's add\ncond_resched() into get_swap_pages() when failed to find available space\nto avoid softlockup."
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    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mm/swapfile: añadir cond_resched() en get_swap_pages() El bloqueo suave todavía ocurre en get_swap_pages() bajo presión de memoria. 64 núcleos de CPU, 64 GB de memoria y 28 dispositivos zram, el tamaño del disco de cada dispositivo zram es de 50 MB con la misma prioridad que si. Utilice la herramienta stress-ng para aumentar la presión de memoria, lo que hace que el sistema se sobrecargue con frecuencia. Los bucles plist_for_each_entry_safe() en get_swap_pages() podrían alcanzar decenas de miles de veces para encontrar espacio disponible (caso extremo: cond_resched() no se llama en scan_swap_map_slots()). Agreguemos cond_resched() a get_swap_pages() cuando no se pueda encontrar espacio disponible para evitar el bloqueo suave."
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