CVE-2022-49147
block: Fix the maximum minor value is blk_alloc_ext_minor()
Vexday Risk Score
3Bajo
Decisión SSVC (CISA)
Track
Sin señal de explotación → monitorear
CVSS —EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch —
Ciclo de vida
26 feb 2025Publicada en NVD
Recomendación: Monitorear — sin señal de explotación por ahora.
In the Linux kernel, the following vulnerability has been resolved:
block: Fix the maximum minor value is blk_alloc_ext_minor()
ida_alloc_range(..., min, max, ...) returns values from min to max,
inclusive.
So, NR_EXT_DEVT is a valid idx returned by blk_alloc_ext_minor().
This is an issue because in device_add_disk(), this value is used in:
ddev->devt = MKDEV(disk->major, disk->first_minor);
and NR_EXT_DEVT is '(1 << MINORBITS)'.
So, should 'disk->first_minor' be NR_EXT_DEVT, it would overflow.
Productos afectados
Linux · Linux