CVE-2021-29650

Se ha descubierto un problema en el kernel de Linux en versiones anteriores a la 5.11.11. El subsistema netfilter permite a los atacantes causar una denegación de servicio (panic) porque net/netfilter/x_tables.c e include/linux/netfilter/x_tables.h carecen de una barrera de memoria completa al asignar un nuevo valor de tabla, también conocido como CID-175e476b8cdf.

A denial-of-service (DoS) flaw was identified in the Linux kernel due to an incorrect memory barrier in xt_replace_table in net/netfilter/x_tables.c in the netfilter subsystem.

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.