CVE-2023-4244

Una vulnerabilidad de use-after-free en el netfilter del kernel de Linux: nf_tables componente puede ser explotado para lograr la escalada de privilegios locales. Debido a una condición de ejecución entre nf_tables transacción del plano de control de enlace de red y la recolección de elementos no utilizados de nft_set, es posible desbordar el contador de referencia causando una vulnerabilidad de use-after-free. Recomendamos actualizar al commit anterior 3e91b0ebd994635df2346353322ac51ce84ce6d8.

A use-after-free flaw was found in the Linux kernel’s nftables sub-component due to a race problem between the set GC and transaction in the Linux Kernel. This flaw allows a local attacker to crash the system due to a missing call to `nft_set_elem_mark_busy`, causing double deactivation of the element and possibly leading to a kernel information leak problem.

Ross Lagerwall discovered that the Xen netback backend driver in the Linux kernel did not properly handle certain unusual packets from a paravirtualized network frontend, leading to a buffer overflow. An attacker in a guest VM could use this to cause a denial of service or possibly execute arbitrary code. Bien Pham discovered that the netfiler subsystem in the Linux kernel contained a race condition, leading to a use-after-free vulnerability. A local user could use this to cause a denial of service or possibly execute arbitrary code.