CVE-2026-99251 Bucle de reintento infinito en init_vp_index() del kernel Linux
En el kernel Linux, init_vp_index() reintenta indefinidamente si la máscara de CPU de housekeeping HK_TYPE_MANAGED_IRQ no contiene ninguna CPU del nodo NUMA. La corrección omite los nodos sin CPU de housekeeping en el bucle interno y ajusta la verificación de aborto temprano.
CVSS 3.1 · PRELIMINAR
- Probabilidad de explotación · EPSS del 09/110,2 % · percentil 5
- Explotada activamenteNo confirmada
- Exploit públicoNo conocido
Afectados
Linux
desde 6640b5df1a38801be6d0595c8cd2177d968d7ee0 hasta antes de b3993f6dc106ff416c7a613c631e1e0af451aed7desde 6640b5df1a38801be6d0595c8cd2177d968d7ee0 hasta antes de f561392afb44a8a42c54c1cfd3f33dace0b50537desde 6640b5df1a38801be6d0595c8cd2177d968d7ee0 hasta antes de 15dd3429f0e76ca071657e480cb7e6ff3a1af730desde 6640b5df1a38801be6d0595c8cd2177d968d7ee0 hasta antes de 7141331f2d245efc07175802a6bf76badec871eddesde 6640b5df1a38801be6d0595c8cd2177d968d7ee0 hasta antes de 95fec47cdbf747b81ab22affd7252dda6050ad0cdesde 6640b5df1a38801be6d0595c8cd2177d968d7ee0 hasta antes de 32ea0a33e3a0fb7c10c601b43e1b2f6c06a3f5fd
Linux
5.19
Qué hacer
- Verificá si usás Linux y en qué versión.
- Actualizá a la versión corregida que indique el fabricante en su aviso o aplicá su mitigación.
- Revisá registros y accesos de los sistemas expuestos para descartar un uso previo.
Calculadora CVSS
Esta vulnerabilidad todavía no tiene vector CVSS publicado.
Descripción original
In the Linux kernel, the following vulnerability has been resolved:
Drivers: hv: Avoid infinite retry loop in init_vp_index()
There is a retry loop in init_vp_index() where the CPUs from a certain
node are stripped out if they have already been in the allocated cpumask
or not in HK_TYPE_MANAGED_IRQ housekeeping cpumask. If there is no
CPU left, the allocated cpumask is ignored and the process is retried
again. However, if the HK_TYPE_MANAGED_IRQ housekeeping cpumask turns
out not to contain any CPU in that particular node, that will become an
infinite retry loop. This particular problem was reported by sashiko
[1]. This should rarely happen, but we still need to guard against this.
Fix this infinite loop problem by also skipping NUMA node that has no
housekeeping CPU in the inner while loop of init_vp_index(). Also update
the early abort check to check for the absence of online housekeeping
CPUs instead of just the emptiness of the cpumask. As the outer for
loop will only be reached if the housekeeping cpumask has at least one
online CPU, a NUMA node with housekeeping CPUs will eventually be found.
Referencias (6)
- git.kernel.org/stable/c/b3993f6dc106ff416c7a613c631e1e0af451aed7
- git.kernel.org/stable/c/f561392afb44a8a42c54c1cfd3f33dace0b50537
- git.kernel.org/stable/c/15dd3429f0e76ca071657e480cb7e6ff3a1af730
- git.kernel.org/stable/c/7141331f2d245efc07175802a6bf76badec871ed
- git.kernel.org/stable/c/95fec47cdbf747b81ab22affd7252dda6050ad0c
- git.kernel.org/stable/c/32ea0a33e3a0fb7c10c601b43e1b2f6c06a3f5fd
Resumen traducido automáticamente de la descripción original. Fuente: Nureq Monitor. Cómo funciona.