CVE-2021-30002

Se detectó un problema en el kernel de Linux versiones anteriores a 5.11.3, cuando se presenta un dispositivo webcam. video_usercopy en el archivo drivers/media/v4l2-core/v4l2-ioctl.c, presenta una pérdida de memoria para argumentos grandes, también se conoce como CID-fb18802a338b.

A flaw memory leak in the Linux kernel webcam device functionality was found in the way user calls ioctl that triggers video_usercopy function. The highest threat from this vulnerability is to system availability.

It was discovered that the DRM subsystem in the Linux kernel contained double-free vulnerabilities. A privileged attacker could possibly use this to cause a denial of service or possibly execute arbitrary code. Olivier Benjamin, Norbert Manthey, Martin Mazein, and Jan H. Schoenherr discovered that the Xen paravirtualization backend in the Linux kernel did not properly propagate errors to frontend drivers in some situations. An attacker in a guest VM could possibly use this to cause a denial of service. Various other issues were also addressed.