CVE-2024-0193

Description

kernel: netfilter: use-after-free in nft_trans_gc_catchall_sync leads to privilege escalation

Red Hat statement

The upstream commit that introduced this flaw (5f68718b34a5 "netfilter: nf_tables: GC transaction API to avoid race with control plane") is not included in any shipped kernel releases of Red Hat Enterprise Linux 6, 7, and 8. Only local users with `CAP_NET_ADMIN` capability or root can trigger this issue. On Red Hat Enterprise Linux, local unprivileged users can exploit unprivileged user namespaces (CONFIG_USER_NS) to grant themselves this capability. The OpenShift Container Platform (OCP) control planes or master machines are based on Red Hat Enterprise Linux CoreOS (RHCOS) that consists primarily of RHEL components, therefore, it is also affected by this kernel vulnerability. A successful exploit needs necessary privileges (CAP_NET_ADMIN) and direct, local access. A local user in RHCOS is already a root with full permissions, hence existence of this vulnerability does not bring any value from the potential attacker perspective. From the OpenShift containers perspective, this vulnerability cannot be exploited as in OpenShift the cluster processes on the node are namespaced, which means that switching the namespace in the running OpenShift container will not bring necessary capabilities. This means that for OpenShift, the impact of this vulnerability is Low. Similar to the CVE-2023-32233 vulnerability, this has been explained in the following blog post as an example of a "Container escape vulnerability": https://www.redhat.com/en/blog/containers-vulnerability-risk-assessment

CVSS v3: 7.8 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)

Errata / fixed releases

Package state