CVE-2026-99250 Fallo de arranque en el kernel de Linux por inicio temprano de kthreads de printk

Afectados

• Linux

  desde 76f258bf3f2aae570209319944703a92ac64e29e hasta antes de a86bcdd84c8fe7a45f73e12d53fe06fea07d1cebdesde 76f258bf3f2aae570209319944703a92ac64e29e hasta antes de 7595bacee48bc30b5021eccf199d704d4e5e5374desde 76f258bf3f2aae570209319944703a92ac64e29e hasta antes de 792acd173da0884f0172c68cb473f42cf93c647edesde 76f258bf3f2aae570209319944703a92ac64e29e hasta antes de 5f339c46f153184570f16c8e789c9709b14cbe8b

• Linux

  6.12

Qué hacer

1. Verificá si usás Linux y en qué versión.
2. Actualizá a la versión corregida que indique el fabricante en su aviso o aplicá su mitigación.
3. 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: printk: Postpone kthread startup There have been various bug reports related to SMP systems hanging on boot. The reports vary but seem to have some overlap with regard to missed IPI's during SMP setup. The reports also show that reverting NBCON console usage allows the bugs to disappear. The NBCON kthreads for console printing are started very early during boot using early_initcall(). Since these kthreads are asynchronously enabling/disabling interrupts during early boot, they may be interfering with early SMP setup on some hardware platforms. Starting the console printing kthreads later has shown to avoid the hanging on systems that could previously reproduce the issue. Postpone kthread starting until after all arch initcalls have completed.

Referencias (4)

• git.kernel.org/stable/c/a86bcdd84c8fe7a45f73e12d53fe06fea07d1ceb
• git.kernel.org/stable/c/7595bacee48bc30b5021eccf199d704d4e5e5374
• git.kernel.org/stable/c/792acd173da0884f0172c68cb473f42cf93c647e
• git.kernel.org/stable/c/5f339c46f153184570f16c8e789c9709b14cbe8b

Resumen traducido automáticamente de la descripción original. Fuente: Nureq Monitor. Cómo funciona.