Linux kernel built with the User Namespaces(CONFIG_USER_NS) support is vulnerable to a potential privilege escalation flaw. It could occur when a root owned process tries to enter a user namespace, wherein a user attempts to attach the entering process via ptrace(1). A privileged name space user could use this flaw to potentially escalate their privileges on the system. Upstream fix: ------------- -> https://lkml.org/lkml/2015/12/25/71 Reference: ---------- -> http://seclists.org/oss-sec/2015/q4/614
Created kernel tracking bugs for this issue: Affects: fedora-all [bug 1295288]
Statement: This issue does not affect the versions of the kernel package as shipped with Red Hat Enterprise Linux 5, 6, 7 and Red Hat Enterprise MRG 2.
kernel-4.3.3-300.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.
kernel-4.3.4-200.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.