CVE-2024-27001

En el kernel de Linux, se resolvió la siguiente vulnerabilidad: comedi: vmk80xx: corrige la verificación de endpoints incompleta Si bien vmk80xx tiene implementada la verificación de endpoints, algunas cosas pueden pasar desapercibidas. Dependiendo del modelo de hardware, las URB pueden tener un tipo masivo o de interrupción, y la versión actual de la función vmk80xx_find_usb_endpoints() no lo tiene completamente en cuenta. Si bien esta advertencia no parece ser demasiado dañina, al menos bloqueará los sistemas que tengan configurado 'panic_on_warn'. Solucione el problema encontrado por Syzkaller [1] simplificando un poco el proceso de verificación de endpoints con usb_find_common_endpoints() y asegurándose de que solo estén presentes los tipos de endpoints esperados. Este parche no ha sido probado en hardware real. [1] Informe Syzkaller: usb 1-1: BOGUS urb xfer, tubería 1! = tipo 3 ADVERTENCIA: CPU: 0 PID: 781 en drivers/usb/core/urb.c:504 usb_submit_urb+0xc4e/0x18c0 drivers/usb/ core/urb.c:503... Seguimiento de llamadas: usb_start_wait_urb+0x113/0x520 drivers/usb/core/message.c:59 vmk80xx_reset_device drivers/comedi/drivers/vmk80xx.c:227 [en línea] vmk80xx_auto_attach+0xa1c /0x1a40 drivers/comedi/drivers/vmk80xx.c:818 comedi_auto_config+0x238/0x380 drivers/comedi/drivers.c:1067 usb_probe_interface+0x5cd/0xb00 drivers/usb/core/driver.c:399 ... También se encontró un problema similar por Syzkaller:

In the Linux kernel, the following vulnerability has been resolved: comedi: vmk80xx: fix incomplete endpoint checking While vmk80xx does have endpoint checking implemented, some things can fall through the cracks. Depending on the hardware model, URBs can have either bulk or interrupt type, and current version of vmk80xx_find_usb_endpoints() function does not take that fully into account. While this warning does not seem to be too harmful, at the very least it will crash systems with 'panic_on_warn' set on them. Fix the issue found by Syzkaller [1] by somewhat simplifying the endpoint checking process with usb_find_common_endpoints() and ensuring that only expected endpoint types are present. This patch has not been tested on real hardware. [1] Syzkaller report: usb 1-1: BOGUS urb xfer, pipe 1 != type 3 WARNING: CPU: 0 PID: 781 at drivers/usb/core/urb.c:504 usb_submit_urb+0xc4e/0x18c0 drivers/usb/core/urb.c:503 ... Call Trace: <TASK> usb_start_wait_urb+0x113/0x520 drivers/usb/core/message.c:59 vmk80xx_reset_device drivers/comedi/drivers/vmk80xx.c:227 [inline] vmk80xx_auto_attach+0xa1c/0x1a40 drivers/comedi/drivers/vmk80xx.c:818 comedi_auto_config+0x238/0x380 drivers/comedi/drivers.c:1067 usb_probe_interface+0x5cd/0xb00 drivers/usb/core/driver.c:399 ... Similar issue also found by Syzkaller:

Ziming Zhang discovered that the DRM driver for VMware Virtual GPU did not properly handle certain error conditions, leading to a NULL pointer dereference. A local attacker could possibly trigger this vulnerability to cause a denial of service. It was discovered that the ATA over Ethernet driver in the Linux kernel contained a race condition, leading to a use-after-free vulnerability. An attacker could use this to cause a denial of service or possibly execute arbitrary code.