CVE-2021-29266

Se detectó un problema en el kernel de Linux versiones anteriores a 5.11.9. El archivo drivers/vhost/vdpa.c presenta un uso de la memoria previamente liberada porque v-) config_ctx presenta un valor no válido al volver a abrir un dispositivo de caracteres, también se conoce como CID-f6bbf0010ba0.

Ryota Shiga discovered that the eBPF implementation in the Linux kernel did not properly verify that a BPF program only reserved as much memory for a ring buffer as was allocated. A local attacker could use this to cause a denial of service or execute arbitrary code. Manfred Paul discovered that the eBPF implementation in the Linux kernel did not properly track bounds on bitwise operations. A local attacker could use this to cause a denial of service or execute arbitrary code. Various other issues were also addressed.