CVE-2023-5345

Se puede explotar una vulnerabilidad de use-after-free en el componente fs/smb/client del kernel de Linux para lograr una escalada de privilegios local. En caso de un error en smb3_fs_context_parse_param, se liberó ctx->password pero el campo no se configuró en NULL, lo que podría provocar una doble liberación. Recomendamos actualizar al commit anterior e6e43b8aa7cd3c3af686caf0c2e11819a886d705.

A flaw was found in the SMB client component in the Linux kernel. In case of an error in smb3_fs_context_parse_param, `ctx->password` was freed, but the field was not set to NULL, potentially leading to a use-after-free vulnerability. This flaw allows a local user to crash or potentially escalate their privileges on the system.

This update for the Linux Kernel 5.14.21-150400_24_81 fixes several issues. The following security issues were fixed. Fixed use-after-free vulnerability in nf_tables can be exploited to achieve local privilege escalation. Fixed a use-after-free vulnerability in netfilter: nf_tables component can be exploited to achieve local privilege escalation. Fixed an use-after-free vulnerability in the fs/smb/client component which could be exploited to achieve local privilege escalation. Fixed a use-after-free vulnerability in the Unix domain sockets component which could be exploited to achieve local privilege escalation. Fixed an incorrect verifier pruning in BPF that could lead to unsafe code paths being incorrectly marked as safe, resulting in arbitrary read/write in kernel memory, lateral privilege escalation, and container escape.